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Journal Cover Microporous and Mesoporous Materials
  [SJR: 1.243]   [H-I: 116]   [8 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1387-1811
   Published by Elsevier Homepage  [3043 journals]
  • Magnetic mesoporous silica nanoparticles coated with thermo-responsive
           copolymer for potential chemo- and magnetic hyperthermia therapy
    • Authors: Zhengfang Tian; Xia Yu; Zhijun Ruan; Min Zhu; Yufang Zhu; Nobutaka Hanagata
      Pages: 1 - 9
      Abstract: Publication date: 15 January 2018
      Source:Microporous and Mesoporous Materials, Volume 256
      Author(s): Zhengfang Tian, Xia Yu, Zhijun Ruan, Min Zhu, Yufang Zhu, Nobutaka Hanagata
      We developed a potential chemo- and magnetic hyperthermia therapeutic platform based on thermo-responsive copolymer coated magnetic mesoporous silica nanoparticles (MMSN@P(NIPAM-co-MAA)). The structure, magnetic heating capacity, drug release behavior, in vitro cytotoxicity, cell uptake, and synergistic therapeutic efficacy of MMSN@P(NIPAM-co-MAA) nanoparticles were investigated. The prepared superparamagnetic MMSN@P(NIPAM-co-MAA) nanoparticles had an average particle size of 255 ± 28 nm. The saturation magnetization was 6.2 emu/g and resulted in heat generation to hyperthermia temperature under an alternating magnetic field within a short period. MMSN@P(NIPAM-co-MAA) nanoparticles could load doxorubicin hydrochloride (DOX), and exhibited temperature- and pH-responsive drug release behavior. Importantly, MMSN@P(NIPAM-co-MAA) nanoparticles had low cytotoxicity and were internalized by HeLa cells. The DOX-loaded nanoparticles showed a synergistic effect that combined chemo- and magnetic hyperthermia therapy, resulting in higher efficacy to kill cancer cells. Thus, MMSN@P(NIPAM-co-MAA) nanoparticles have great potential for cancer therapy.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.053
      Issue No: Vol. 256 (2017)
       
  • Ordered mesoporous N-doped carbon supported Ru for selective adsorption
           and hydrogenation of quinoline
    • Authors: Xiaolong Yu; Renfeng Nie; Haifu Zhang; Xinhuan Lu; Dan Zhou; Qinghua Xia
      Pages: 10 - 17
      Abstract: Publication date: 15 January 2018
      Source:Microporous and Mesoporous Materials, Volume 256
      Author(s): Xiaolong Yu, Renfeng Nie, Haifu Zhang, Xinhuan Lu, Dan Zhou, Qinghua Xia
      Ordered mesoporous N-doped carbon (OMNC) is prepared via a facile nanocasting approach using ethylenediamine (EDA) and carbon tetrachloride (CTC) as precursors, for which the pore structure, N-dopants and basicity are strongly dependent on the pyrolysis temperature (500–800 °C). After supporting 2.5% Ru by incipient wetness impregnation, the imitate interaction of N-dopants with Ru has a strong influence on the activity and selectivity of quinoline hydrogenation, as disclosed by XPS and H2-TPR studies. It is found that Ru/OMNC-700 obtained at 700 °C shows superior substrate adsorption and catalytic activity under mild conditions (40 °C and 1 MPa H2). The turnover frequency (TOF) and activation energy of Ru/OMNC-700 for the hydrogenation of quinoline are 71.0 h−1 and 31.37 kJ/mol. In particular, this catalyst retains 98.3% of the initial catalytic activity after 5 recycles and shows high compatibility with various N-heterocycles with good conversion and high selectivity, attributed to the strong electron donation from OMNC-700 to Ru and the enhanced adsorption of pyridine ring with high selectivity over OMNC-700. This strategy for the preparation of the supported Ru catalysts opens a new possibility of designing highly efficient heterogeneous catalysts in the future.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.048
      Issue No: Vol. 256 (2017)
       
  • Investigation on the micro-structure and adsorption capacity of cellulosic
           biomass carbon based montmorillonite composite
    • Authors: Xiaodong Yang; Fangfei Li; Maosheng Xia; Feng Luo; Yinshan Jiang
      Pages: 18 - 24
      Abstract: Publication date: 15 January 2018
      Source:Microporous and Mesoporous Materials, Volume 256
      Author(s): Xiaodong Yang, Fangfei Li, Maosheng Xia, Feng Luo, Yinshan Jiang
      Biomass derived amorphous carbon has received considerable attention in recent years for its great potential applications. In this work, the cellulosic biomass carbon based montmorillonite composite is synthesized by using carbon-bed pyrolysis method. The micro-structure and properties of samples are characterized by Raman, XRD, FT-IR, SEM, TEM and adsorption analyses. The results demonstrates that the montmorillonite components used to enhance the surface performance (granule-layer structure) also has strengthened the Methylene Blue adsorption capacity of biomass carbon in composite, the adsorption capacity is enhanced as the MT concentration increases, the maximum equilibrium value is obtained for 15 wt% montmorillonite mixed biomass carbon composite (93.5 mg/g), which confirms the effects of clay mineral (montmorillonite) on the biomass carbon in carbon-clay composite system. The isotherm data fits the Freundlich isotherm model (R2 = 0.927) corresponding to the physical adsorption (n = 1.214, favorable adsorption). The kinetic data is well described by the intraparticle diffusion model (R2 = 0.939), indicating the intraparticle diffusion controlled adsorption process.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.052
      Issue No: Vol. 256 (2017)
       
  • Pd@MIL-100(Fe) composite nanoparticles as efficient catalyst for reduction
           of 2/3/4-nitrophenol: Synergistic effect between Pd and MIL-100(Fe)
    • Authors: Bo Xu; Xuejiao Li; Zhiming Chen; Tao Zhang; Cuncheng Li
      Pages: 1 - 6
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Bo Xu, Xuejiao Li, Zhiming Chen, Tao Zhang, Cuncheng Li
      Pd@MIL-100(Fe) composite nanoparticles were synthesized and characterized by high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction analysis, nitrogen adsorption-desorption analysis, X-ray photoelectron spectroscopic (XPS) analysis, energy-dispersive X-ray spectroscopy (EDS) and element mapping. Due to the local restriction or confinement effect of the unique pore/surface structure within the MIL-100(Fe) nanospheres, small Pd nanoparticle (4–6 nm) were obtained with high stability without using any surfactant as stabilizer. The as-synthesized Pd@MIL-100(Fe) composite nanoparticles were then employed for the catalytic reduction of 2/3/4-nitrophenol, which exhibiting high catalytic activity and recyclability attributed to the synergistic effect between Pd nanoparticles and MIL-100(Fe) nanospheres.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.008
      Issue No: Vol. 255 (2017)
       
  • Synthesis of reduced graphene oxide/NiO nanocomposites for the removal of
           Cr(VI) from aqueous water by adsorption
    • Authors: Kexin Zhang; Haiyan Li; Xingjian Xu; Hongwen Yu
      Pages: 7 - 14
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Kexin Zhang, Haiyan Li, Xingjian Xu, Hongwen Yu
      In this work, we report a room-temperature approach to synthesizing reduced graphene oxide/NiO (RGO/NiO) nanocomposites. The chemical structure of RGO/NiO nanocomposites were investigated by Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray power diffraction (XRD). It is shown by the experiment that the RGO/NiO nanocomposites have strong capacity to absorb the hexavalent chromium ion (Cr (VI)), the maximum adsorption capacity of Cr (VI) on RGO/NiO nanocomposites at pH = 4 and T = 25 °C can reach 198 mg g−1, higher than any other currently reported. The adsorption kinetic data were well described by a pseudo-second-order model. Both Freundlich and Langmuir isotherm models were applied to the experimental data analysis, and the latter proved to be a better fit. The pH value markedly affected the adsorption behavior of RGO/NiO nanocomposites, but the effect of temperature was insignificant. The probable mechanism of synergistic adsorption of Cr (VI) ions was considered. These results suggest that RGO/NiO nanocomposites have the potential to be applied in industrial wastewater treatment.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.037
      Issue No: Vol. 255 (2017)
       
  • A hollow mesoporous silica and poly(diacetone acrylamide) composite with
           sustained-release and adhesion properties
    • Authors: Yunhao Gao; Amir E. Kaziem; Yanhui Zhang; Yanan Xiao; Shun He; Jianhong Li
      Pages: 15 - 22
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Yunhao Gao, Amir E. Kaziem, Yanhui Zhang, Yanan Xiao, Shun He, Jianhong Li
      Controlled release formulation of pesticides is a highly desirable way to increase the efficiency of the pesticide as well as help reduce environmental pollution issues. In the present study, a novel adhesive organic-inorganic hybrid material with a uniform size and morphology was fabricated employing hollow mesoporous silica (HMS) as an inlayer material and poly(diacetone acrylamide) (PDAAM) as an outer layer material. HMS was fabricated using polystyrene (PS) spheres as a hard template. Then, HMS was functionalized with 3-aminopropyltriethoxysilane and 2-bromoisobutyryl bromide after removal of PS. Finally, PDAAM was grafted onto HMS using surface-initiated atom transfer radical polymerization. Cyantraniliprole (CNAP) utilized as a model pesticide was incorporated into hybrid material to prepare controlled release formulation. The results showed that both CNAP−loaded HMS and HMS−PDAAM had extraordinary loading efficiencies (approximately 50% w/w). Kinetic studies of CNAP release demonstrated that CNAP−loaded HMS−PDAAM exhibited a sustained release property for at least 25 days. The stability test identified that CNAP−loaded HMS and HMS−PDAAM were much more stable under UV irradiation and thermal conditions than CNAP technical. Tests of the adhesive properties showed that the adhesive property of HMS−PDAAM was far stronger than that of HMS on rice leaves. Given the advantages of HMS−PDAAM, this hybrid material may be applied to other photosensitive pesticides, especially those used for foliar spraying.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.025
      Issue No: Vol. 255 (2017)
       
  • Experimental and molecular dynamics studies on the transport and
           adsorption of chloride ions in the nano-pores of calcium silicate phase:
           The influence of calcium to silicate ratios
    • Authors: Yang Zhou; Dongshuai Hou; Jinyang Jiang; Lin Liu; Wei She; Jiao Yu
      Pages: 23 - 35
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Yang Zhou, Dongshuai Hou, Jinyang Jiang, Lin Liu, Wei She, Jiao Yu
      Chloride transport in the gel pore determines the durability of concrete material. In this paper, experiments and molecular dynamics (MD) simulation were utilized to systematically investigate chemical composition (calcium to silicate ratio C/S) influence on the transport and adsorption behavior of water, calcium and chloride ions confined in the nano-pores of calcium silicate hydrate (C-S-H). The immersion experiments indicate C-S-H samples with higher C/S ratio have better chloride adsorption capability and the zeta potential measurements proved the calcium ions can determine the surface potential in the system and strongly affect the chloride adsorption. In the MD simulation, with increasing C/S ratio, the long surface silicate chains are broken to defective short chains that can provide more non-bridging oxygen sites to accumulate surface water molecules and calcium atoms. There existed strong spatial correlation between surface calcium and chloride ions in the radial distribution function patterns, which confirms that the surface calcium plays critical role in chloride adsorption. Furthermore, the interaction mechanism between calcium and chloride ions can be categorized into two parts, the stronger one caused by the formation of ionic pairs Ca-Cl (within 3 Å), and the weaker interaction at larger distance (around 4-6Å). Therefore, high calcium concentration in the vicinity of surface contributes to stronger chloride adsorption, more Ca-Cl accumulation and longer resident time.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.024
      Issue No: Vol. 255 (2017)
       
  • Effect of the structure of CN/Silica composite support on the catalytic
           performances of Co3O4 for CO oxidation
    • Authors: Heng Yang; Weihan Yang; Kangle Lv; Junjiang Zhu; Yang Xia; Dingguo Tang; Lili Wen
      Pages: 36 - 43
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Heng Yang, Weihan Yang, Kangle Lv, Junjiang Zhu, Yang Xia, Dingguo Tang, Lili Wen
      Noble metals are good catalysts for CO oxidation, but their limited reserves and high cost promote the finding of new and low-cost alternatives. In this paper, we systematically studied the effect of three kinds of carbon nitride/silica composite supports (CN/SBA-16, CN/SBA-15 and CN/MCF) on the catalytic oxidation of CO over Co3O4 catalyst. It was found that Co3O4 locates on the surface when CN/SBA-16 is used as support, while locates inside the pores if CN/SBA-15 and CN/MCF are used as supports. The Co3O4 located on the surface exhibits stronger reducibility and higher Co3+/Co2+ molar ratio than that located inside the pores. This can be that the Co3O4 which located inside the pores is stabilized by the silica, making the electrons hard to be excited. Catalytic tests showed that the Co3O4 supported on CN/SBA-16 composites (i.e., Co/CN/SBA-16) shows the best activity to the reaction, with full CO conversion obtained at 175 °C, which can be recycled for at least five times with no loss of activity, indicating the promising applications.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.016
      Issue No: Vol. 255 (2017)
       
  • Rh-Mn/tungsten carbides for direct synthesis of mixed alcohols from
           syngas: Effects of tungsten carbide phases
    • Authors: Ba Da Won; Min Hye Jeong; Myeong Hun Kim; Chan-Hwa Chung; Dong Ju Moon; Young-Woong Suh; Joon Hyun Baik; Jong Wook Bae
      Pages: 44 - 52
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Ba Da Won, Min Hye Jeong, Myeong Hun Kim, Chan-Hwa Chung, Dong Ju Moon, Young-Woong Suh, Joon Hyun Baik, Jong Wook Bae
      Effects of the crystalline tungsten carbide (WxC) phases on an ordered mesoporous bimetallic Rh-Mn/WxC, which were prepared by changing carbon source to tungsten (C/W) ratios of the WxC support using a hard-template of an ordered mesoporous SBA-15, were investigated for a direct synthesis of mixed alcohols by CO hydrogenation from syngas. The C/W ratios on the mesoporous Rh-Mn/WxC showed a significantly different catalytic activity, especially on the C1 - C3 alcohol productivity. The Rh-Mn/WxC prepared at C/W molar ratio of 10 having a metastable W2C main phase (Rh-Mn/WxC(10)) revealed a higher CO conversion of 8.1% and selectivity to higher alcohols of 54.4% compared to other catalysts having a main crystalline phases of WO3 or WC. The enhanced catalytic activity and selectivity to mixed alcohols on the Rh-Mn/WxC(10) were attributed to the largely exposed smaller active Rh nanoparticles with its stronger interactions with the metastable W2C phases. The superior activity was originated from the intimate interactions of Rh nanoparticles with Mn promoter by maintaining proper oxidation states confirmed by surface ratios of the metallic Rh to oxidized Rh n+ species. The stable preservation of the ordered mesoporous structures of the W2C phase in the amorphous carbon matrixes significantly altered the chemical states of the small Rh nanoparticles below 2 nm in size by preferentially existing on the outer surfaces of the W2C support, which resulted in showing an enhanced productivity of higher C1 –C3 alcohols with 171.8 g/(kgcat·h).
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.026
      Issue No: Vol. 255 (2017)
       
  • Porous nitrogen-doped carbon monoliths derived from biopolymer-structured
           liquid precursors
    • Authors: Thomas Jordan; Zhi-Long Yu; Shu-Hong Yu; Markus Antonietti; Nina Fechler
      Pages: 53 - 60
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Thomas Jordan, Zhi-Long Yu, Shu-Hong Yu, Markus Antonietti, Nina Fechler
      Nitrogen-doped carbon monoliths can be prepared from liquid, deep eutectic mixtures of urea and hexaketocyclohexane octahydrate, which are structured by chitosan as a natural in-situ scaffold and support. The as-formed polymer monolith can then be transformed into the respective nitrogen-doped carbon monolith with a high surface area, high mesoporosity and high nitrogen-content. The surface functionality as well as the access to the internal pore structure were demonstrated by carbon dioxide and dye sorption experiments. The applied synthetic procedure is simple, does not require additional activation steps and uses cheap and naturally abundant compounds avoiding typical and hazardous formaldehyde resins. Eventually, this offers a safe and sustainable alternative to current carbon monolith synthesis.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.032
      Issue No: Vol. 255 (2017)
       
  • Enhanced photocatalytic activity of TiO2/zeolite composite for abatement
           of pollutants
    • Authors: Guangxin Zhang; Ankang Song; Yongwei Duan; Shuilin Zheng
      Pages: 61 - 68
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Guangxin Zhang, Ankang Song, Yongwei Duan, Shuilin Zheng
      The TiO2/zeolite composite was synthesized through a hydrolysis deposition method combined with a calcination crystallization process. The composites were characterized by XRD, N2 adsorption-desorption, SEM, TEM, XPS and UV-vis DRS. The effect of acid leaching on the physicochemical property, adsorption capacity and photocatalytic performance of the TiO2/zeolite was analyzed. The characterization results revealed that well-dispersed anatase TiO2 nanoparticles were loaded on the surface of acid leaching zeolite. The photoactivities of composites were examined by degrading gaseous (formaldehyde) and aqueous (phenol, methyl orange and rhodamine B) organic pollutants. The results indicated that TiO2/acid leaching zeolite composite had the strong photoactivity than TiO2/natural zeolite composite. The enhanced photoactivity can be attributed to the higher surface area and more surface hydroxyl groups. The excellent activity reveals that TiO2/zeolite composite is a promising photocatalyst in pollutants degradation.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.028
      Issue No: Vol. 255 (2017)
       
  • Synthesis of Al2O3/carbon composites from wastewater as superior
           adsorbents for Pb(II) and Cd(II) removal
    • Authors: Hang Chen; Jianmin Luo; Xiao Wang; Xiaoyu Liang; Yunlong Zhao; Chao Yang; Murzabek Ispolovich Baikenov; Xintai Su
      Pages: 69 - 75
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Hang Chen, Jianmin Luo, Xiao Wang, Xiaoyu Liang, Yunlong Zhao, Chao Yang, Murzabek Ispolovich Baikenov, Xintai Su
      Al2O3/carbon (Al2O3/C) composites obtained from the alkaline wastewater of oil refinery and acid wastewater of aluminum anodizing factory have been studied with the principle of “using waste to treat waste”. The process includes these steps: (1) acid-alkali neutralization, (2) evaporation, (3) calcination, (4) washing and drying. The Al2O3/C composites prepared by calcinating the precursors under Ar atmosphere are used as high-capacity adsorbents for removal of Pb(II) and Cd(II) from aqueous solutions. For Pb(II), the adsorptive behavior satisfies the Langmuir assumptions and the maximum adsorption capacity reaches to 709.2 mg g−1. For Cd (II), the adsorptive behavior satisfies the Freundlich assumptions and the equilibrium adsorption capacity is up to 1299.4 mg g−1. For single adsorption of Pb(II) and Cd(II), the adsorption kinetics follows Pseudo-second-order model well. This route shows a possible way of reducing emissions to the environment, recovering resource as a valuable material, and providing a novel strategy for wastewater treatment.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.023
      Issue No: Vol. 255 (2017)
       
  • Facile synthesis of triazine-triphenylamine-based microporous covalent
           polymer adsorbent for flue gas CO2 capture
    • Authors: Swapan K. Das; Xinbo Wang; Zhiping Lai
      Pages: 76 - 83
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Swapan K. Das, Xinbo Wang, Zhiping Lai
      The sustainable capture and sequestration of CO2 from flue gas emission is an important and unavoidable challenge to control greenhouse gas release and climate change. In this report, we describe a triazine-triphenylamine-based microporous covalent organic polymer under mild synthetic conditions. 13C and 15N solid-state NMR and FTIR analyses confirm the linkage of the triazine and triphenylamine components in the porous polymer skeleton. The material is composed of spherical particles 1.0 to 2.0 μm in size and possesses a high surface area (1104 m2/g). The material exhibits superb chemical robustness under acidic and basic conditions and high thermal stability. Single-component gas adsorption exhibits an enhanced CO2 uptake of 3.12 mmol/g coupled with high sorption selectivity for CO2/N2 of 64 at 273 K and 1 bar, whereas the binary gas mixture breakthrough study using a model flue gas composition at 298 K shows a high CO2/N2 selectivity of 58. The enhanced performance is attributed to the high Lewis basicity of the framework, as it favors the interaction with CO2.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.038
      Issue No: Vol. 255 (2017)
       
  • Broadband antireflective superhydrophilic antifogging nano-coatings based
           on three-layer system
    • Authors: Xin Du; Yi Xing; Mengyun Zhou; Xiaoyu Li; Hongwei Huang; Xiang-Min Meng; Yongqiang Wen; Xueji Zhang
      Pages: 84 - 93
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Xin Du, Yi Xing, Mengyun Zhou, Xiaoyu Li, Hongwei Huang, Xiang-Min Meng, Yongqiang Wen, Xueji Zhang
      The multifunctional nano-coatings with super-wettability, unique optical property, and excellent mechanical strength and weatherability are highly desirable due to their wide applications. However, up to now, it is still very difficult to balance the relationships among these properties due to structural confliction. In this work, the broadband antireflective superhydrophilic antifogging nano-coatings are successfully constructed based on three-layer system by a sequential dip-coating method. The coating of dendrimer-like mesoporous silica nanoparticles (DMSNs) as top-layer not only increases the roughness of coating surface to enhance the wettability, but also keep high transmittance of the coated glass slides. Simple chemical vapor deposition is performed to improve the mechanical stability of nano-coatings. The finally obtained glass slide with the optimal nano-coating has high transmittance (97.7% at the wavelength of 494 nm, and ca. 5.0% increase of mean transmittance in the visible wavelength range of 390–780 nm), superhydrophilic (WCAs after 0.5 s of spreading: 4.3°) anti-fogging behavior, and good mechanical strength. This work provides an exploration way about how to balance the structural parameters to obtain the multifunctional nano-coatings for optical devices and energy harvesting.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.017
      Issue No: Vol. 255 (2017)
       
  • Modification of silica with NH4+ agents to prepare an acidic support for
           iridium hydrogenation catalyst
    • Authors: Ewa Janiszewska; Monika Kot; Michał Zieliński
      Pages: 94 - 102
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Ewa Janiszewska, Monika Kot, Michał Zieliński
      The inert SiO2 was modified with basic or slightly acidic aqueous solutions of ammonium compounds in order to impact acidic properties to its surface. The obtained silica samples were used as supports for iridium catalysts (1 wt%). The influence of the support acidity on the activity of iridium catalyst for toluene hydrogenation was examined. The acidity of the modified SiO2 was estimated by means of temperature-programmed desorption of ammonia (NH3-TPD) and FT-IR spectra of adsorbed pyridine. It has been found that the sample treated with the basic solution had a higher total acidity, however, the sample modified with the acidic solution had a higher contribution of strong Lewis acid sites. The acidic solution-treated sample had also a higher number of silanol groups compared to the parent SiO2 (FT-IR data). The activity of iridium catalysts supported on the modified samples (particularly that on the acidic solution-treated SiO2) for toluene hydrogenation was higher than that of the catalyst supported on unmodified SiO2. The obtained results bring to conclusion that catalytic activity for toluene hydrogenation is influenced by the contribution of strong Lewis acid sites and the content of silanol groups rather than by total acidity.
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      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.031
      Issue No: Vol. 255 (2017)
       
  • Oxo-vanadium (IV) complex supported by microporous organic nanotube
           frameworks: A high selective heterogeneous catalyst for the oxidation of
           thiols to disulfides
    • Authors: Hui Zhang; Minghong Zhou; Linfeng Xiong; Zidong He; Tianqi Wang; Yang Xu; Kun Huang
      Pages: 103 - 109
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Hui Zhang, Minghong Zhou, Linfeng Xiong, Zidong He, Tianqi Wang, Yang Xu, Kun Huang
      An efficient oxidation catalyst has been synthesized by anchoring oxo-vanadium (IV) onto the amino-functional microporous organic nanotube frameworks (NH2-MONFs). The amino groups are used to immobilize oxo-vanadium (IV) into the porous organic polymer supporter. The resulting oxo-vanadium (IV) complexes have a high surface area, large pore volume, hierarchically porous structure and robust organic network, which have great potential application in heterogeneous catalysis. The introduction of mesoporous tubular channels in the network units improves mass transfer in the catalytic system and the well distribution of catalytic sites in the channels facilitates the accessibility of active sites, which will be beneficial for good catalytic performance in heterogeneous catalysis. The prepared oxo-vanadium heterogeneous catalyst shows high catalytic activity and excellent stability in the selective oxidation reactions of thiols to disulfides.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.041
      Issue No: Vol. 255 (2017)
       
  • Synthesis of magnetic yolk-shell mesoporous carbon architecture for the
           effective adsorption of sulfamethazine drug
    • Authors: Ijaz Hussain; Yang Li; Junwen Qi; Jiansheng Li; Xiuyun Sun; Jinyou Shen; Weiqing Han; Lianjun Wang
      Pages: 110 - 118
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Ijaz Hussain, Yang Li, Junwen Qi, Jiansheng Li, Xiuyun Sun, Jinyou Shen, Weiqing Han, Lianjun Wang
      In this work, Fe3O4@C yolk-shell carbon architecture were fabricated in one pot sol-gel process and further examined as adsorbents for the removal of sulfamethazine. To understand yolk-shell structure on the adsorption properties of sulfamethazine, another adsorbent without hollow cavity, i.e., Fe3O4@SiO2@C carbon material, was also prepared for comparison. The adsorption results showed the yolk-shell carbon materials complied with the pseudo-second order kinetics model. Based on the Langmuir model the yolk shell material possess a Qmax of 312 mg g−1, which is higher than that of core-shell materials (236 mg g−1). Due to the magnetic property, the yolk-shell carbon materials can be retrieved facilely from the aqueous media by an external magnet and 89.1% of recovery can be achieved over five adsorption desorption cycles. Possessing high surface area, a well-defined interface of the material and central cavity the as-prepared material has proved to be a potentially eminent adsorbent for the broad scale removal of sulfamethazine from industrial processes.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.027
      Issue No: Vol. 255 (2017)
       
  • Catalytic removal of organic template from TEA-β zeolite by copper
           ions
    • Authors: Wei Di; Fengmei Zhang; Yulong Zhang
      Pages: 119 - 129
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Wei Di, Fengmei Zhang, Yulong Zhang
      The simultaneous decomposition of organic template and incorporation of copper ions into the zeolite were investigated during the heating mixture of copper chloride hydroxide and TEA-β zeolite under static air atmosphere. Detailed characterizations of the samples during calcination and subsequent copper removal treatment were performed with the aid of TG/MS, IR, XRD, pyridine-IR, XPS, 27Al and 29Si MAS-NMR. It was evidenced that the zeolite detemplation process facilitated the copper ions reduction and migration, inducing the solid ion exchange of copper species with TEA-β zeolite at lower temperature. These reduced copper ions migrated into the zeolite to occupy BrØnsted acid sites, and acted as catalysts to accelerate the oxidative decomposition of organic molecules significantly. The result showed that the virtually complete removal of organic template and incorporation of copper ions were obtained in one step by calcination at 350 °C for 3 h, and these ingoing copper species could be easily removed by re-exchanging with ammonium solution. After detemplation and copper removal, the purified H-β zeolite could still retain a well-defined structure and BrØnsted acid sites, showing a higher catalytic activity on the alkylation of benzene with ethylene compared with the conventionally prepared H-β zeolite.
      Graphical abstract image

      PubDate: 2017-07-23T16:31:06Z
      DOI: 10.1016/j.micromeso.2017.07.020
      Issue No: Vol. 255 (2017)
       
  • Glucose isomerisation into fructose over Mg-impregnated Na-zeolites:
           Influence of zeolite structure
    • Authors: I. Graça; M.C. Bacariza; D. Chadwick
      Pages: 130 - 139
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): I. Graça, M.C. Bacariza, D. Chadwick
      Magnesium-impregnated NaY, NaMOR, NaBEA, NaZSM-5 and NaFER zeolites have been prepared and investigated for glucose isomerisation into fructose. It was shown that better magnesium dispersion and smaller reduction of textural properties were obtained with three-dimensional rather than with mono- and two-dimensional zeolites. MgO particle size was also observed to be dependent on the zeolite structure. Various contributions were found to affect the final catalyst performances: availability of MgO, the strength of basic sites, location where the reaction takes place, and the extent of homogeneous reaction due to Na and Mg leaching. Higher glucose conversions were achieved over the MOR, BEA and ZSM-5 zeolites (37–39%), while Y and FER zeolites presented a relatively moderate performance (28 and 27%). In general, lower fructose selectivities were reached for the most active samples, except for the ZSM-5 zeolite. For this catalyst, the reaction appeared to take place mostly on the external surface due to the smaller pore size. Among the various structures investigated, 5%MgNaY zeolite revealed the most resistance to MgO particle size agglomeration during consecutive reaction runs. In addition, 5%MgNaY was found to be the only catalyst capable of recovering its initial activity when regenerated at high temperature. Thus, the type of zeolite structure selected as support for MgO appears to have a significant effect on the catalyst performance for the glucose isomerisation into fructose, with Y zeolite being the most attractive choice for this application.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.015
      Issue No: Vol. 255 (2017)
       
  • Proton mobility in sulfonic acid functionalized mesoporous materials
           studied by MAS PFG NMR diffusometry and impedance spectroscopy
    • Authors: Nina Dvoyashkina; Christopher F. Seidler; Michael Wark; Dieter Freude; Jürgen Haase
      Pages: 140 - 147
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Nina Dvoyashkina, Christopher F. Seidler, Michael Wark, Dieter Freude, Jürgen Haase
      The proton mobility in sulfonic acid functionalized mesoporous MCM-41, MCM-48 and KIT-6 was studied by impedance spectroscopy and MAS PFG NMR diffusometry. Highest proton conductivities were found at 140 °C as 19 S m−1, 0.48 S m−1, and 37 S m−1, for MCM-41, MCM-48 and KIT-6, respectively. The self-diffusion coefficients of water molecules in functionalized MCM-41 and KIT-6 were found to be smaller than the diffusivity of the bulk water, however, for functionalized MCM-48 they appeared to be larger. For comparison, we calculated diffusion coefficients of the charge carrier from the conductivity values by means of the Nernst-Einstein equation. It turned out that for MCM samples the NMR water diffusivity includes inter-particle contributions and succeeds the charge carrier diffusivity by some order of magnitudes. The reason is that the root-square displacement of the water molecules within the diffusion observation time (20–100 ms) is larger than the mesoporous particle size, which amounts 1–4 μm for the MCM materials. In contrast, for KIT-6 consisting of larger particles of up to 50 μm, it became possible to detect the intra-particle diffusion within the material particles, because the root-square displacement of the species is smaller than the size of the particles. A two-component behavior of the NMR diffusivity can be observed, and the slower component describes the self-diffusion within the particles. The observed intra-particle NMR diffusivity is in agreement with the charge carrier diffusivity. From this, one may conclude that the NMR technique observes the charge carrier diffusivity of hydroxonium or Zundel ions without water fluctuations. Therefore, we claim that the intra-particle proton conduction in functionalized mesoporous materials is a “packed-acid mechanism” without water fluctuation.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.029
      Issue No: Vol. 255 (2017)
       
  • FeOx-kaolinite catalysts prepared via a plasma-assisted hydrolytic
           precipitation approach for Fenton-like reaction
    • Authors: Antoine Tiya-Djowe; Nathalie Ruth; Georges Kamgang-Youbi; Elie Acayanka; Samuel Laminsi; Eric M. Gaigneaux
      Pages: 148 - 155
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Antoine Tiya-Djowe, Nathalie Ruth, Georges Kamgang-Youbi, Elie Acayanka, Samuel Laminsi, Eric M. Gaigneaux
      Iron oxides (FeOx) supported on clay minerals are efficient catalysts for the Fenton-like degradation of organic pollutants in water. This study explores a new preparation route for such catalysts by exploiting the use of gliding arc plasma at atmospheric pressure for the precipitation-deposition of FeOx particles onto kaolinite. The physicochemical properties of the synthesized catalysts and their activity in the degradation of the azoic dye Acid orange 7 (AO7) are herein evaluated. Results show that the catalysts consist of nanosized goethite fibres onto clay particles. The BET surface area of the catalysts was greater than that of kaolinite and depended on the Fe weight percentage in each catalyst. As a consequence, these materials were very active when tested in the catalytic degradation of AO7 (C0 = 25 mg L−1). Abatement efficiencies of 86% and 50% in terms of bleaching and degradation respectively were obtained after 120 min, in the presence of 0.2 g L−1 of catalyst with 9.4 wt% of Fe. Increasing the catalyst dosage enhanced the abatement efficiency. For the catalyst dosage of 3 g L−1, the bleaching and degradation efficiencies were 100% and 80% respectively after only 80 min. Moreover, the catalyst was still active in neutral and basic media, even if lower abatement efficiencies were obtained for neutral and basic dye solutions. On the other hand, the AO7 abatement efficiency of catalyst with 4.4 wt% of Fe was almost equal to that with 9.4 wt%, suggesting that 4.4% of iron in the catalyst is sufficient to transform in a reasonable time, all H2O2 into hydroxyl radicals. Finally, the recycling tests showed that the catalysts remain active even after three consecutive uses.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.036
      Issue No: Vol. 255 (2017)
       
  • Highly monodispersed mesoporous, heterojunction ZnO@Au micro-spheres for
           trace-level detection of NO2 gas
    • Authors: Dinesh Veeran Ponnuvelu; Sukhananazerin Abdulla; Biji Pullithadathil
      Pages: 156 - 165
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Dinesh Veeran Ponnuvelu, Sukhananazerin Abdulla, Biji Pullithadathil
      Highly monodispersed, mesoporous ZnO@Au heterojunction micro-spheres have been successfully synthesized using a two-stage facile chemical method and their surface bound NO2 sensing properties were explored. Room temperature Photoluminescence (RTPL) reveal the presence of high degree of oxygen defects and zinc interstitials for the pristine ZnO mesoporous-spheres and a drastic reduction in PL intensity of the ZnO@Au heterojunction mesoporous-spheres pointing towards the utilization of surface defects for the Au cluster growth, facilitating electron transfer process between ZnO and Au. NO2 gas sensor property analysis of the ZnO@Au mesoporous-spheres showed an extraordinary sensitivity and selectivity at a lower operating temperature of 250 °C than pristine ZnO mesoporous-spheres (450 °C). The enhanced sensing behavior of the ZnO@Au heterojunction mesoporous-spheres can be ascribed to the synergetic effect of Au nanoclusters at the heterojunctions which acts as spill-over zone for the physisorption mediated sensing process and the inherent high surface area and surface defects.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.022
      Issue No: Vol. 255 (2017)
       
  • pH-dependent release of environmentally friendly corrosion inhibitor from
           mesoporous silica nanoreservoirs
    • Authors: C. Zea; R. Barranco-García; J. Alcántara; J. Simancas; M. Morcillo; D. de la Fuente
      Pages: 166 - 173
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): C. Zea, R. Barranco-García, J. Alcántara, J. Simancas, M. Morcillo, D. de la Fuente
      Coatings for corrosion protection usually contain pigments that constantly release substances actively inhibiting corrosion. However, this constant leaching places an important limitation on the protection lifetime of the coating. An intelligent release system may improve the long-term function of a coating, as uncontrolled loss by leaching is inhibited. This ensures that high amounts of inhibitors are still present when needed. Furthermore, this is also favourable for the environment, as no inhibitor is unnecessarily released into it. In this sense, smart mesoporous systems are excellent candidates thanks to their ability to provide more efficient and longer lasting anticorrosive protection by responding quickly to external stimuli such as local environmental changes (temperature, pH, local defects, humidity, etc.). A change in pH is a particularly interesting stimulus since, as is well known, corrosion activity leads to local pH changes in cathodic and anodic areas. In the present paper an environmentally friendly corrosion inhibitor, sodium phosphomolybdate, has been loaded into mesoporous silica nanoparticles. One of the main goals has been to study whether this corrosion inhibitor compound can offer controlled release as a function of pH, even in the absence of encapsulation. The results have shown that the polymerisation processes experienced by molybdenum species, as well as the different phosphate ions present as a function of pH, prevent their release into the environment in the absence of an outer capsule within the pH 3–9 range, thus avoiding the need to carry out an encapsulation stage.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.035
      Issue No: Vol. 255 (2017)
       
  • Co-reaction of methanol and ethylene over MFI and CHA zeolitic catalysts
    • Authors: Qingjun Zhu; Junko N. Kondo; Takashi Tatsumi
      Pages: 174 - 184
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Qingjun Zhu, Junko N. Kondo, Takashi Tatsumi
      Co-reaction of methanol and ethylene (CME) have been performed on a number of proton type MFI zeolites and CHA zeotype materials to investigate the influence of zeolite topology and acidities upon the transformation of reactants and the formation of desired product of propylene. Two other reactions of methanol-to-olefins (MTO) and ethylene transformation (ET, with only ethylene as the reactant) were carried out in order to compare the promotion effect for the propylene productivity. The reactions were carried out at 773 K. The addition of methanol remarkably promoted the ethylene transformation over Al-poor HMFI zeolite and, more importantly, the by-products due to hydrogen-transfer reactions were efficiently inhibited, leading to higher propylene selectivity. Such promotion effect was, however, not significantly observed upon the Al-rich HMFI zeolite. Moreover, such promotion effect of methanol upon ethylene transformation was un-pronounced or non-existed upon the CHA zeotype materials including aluminosilicate, gallosilicate and silicoaluminophosphate, possibly owing to the CHA topology.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.030
      Issue No: Vol. 255 (2017)
       
  • 3D-printed SAPO-34 monoliths for gas separation
    • Authors: Sarah Couck; Julien Cousin-Saint-Remi; Stijn Van der Perre; Gino V. Baron; Clara Minas; Patrick Ruch; Joeri F.M. Denayer
      Pages: 185 - 191
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Sarah Couck, Julien Cousin-Saint-Remi, Stijn Van der Perre, Gino V. Baron, Clara Minas, Patrick Ruch, Joeri F.M. Denayer
      A 3D printing method (the Direct Ink writing, DIW, method) is applied to produce SAPO-34 zeolite based structured adsorbents with the shape of a honeycomb-like monolith. The use of the 3D printing technique gives this structure a well-defined and easily adaptable geometry. As binder material, methyl cellulose was used. The SAPO-34 monolith was characterized by SEM as well as Ar and Hg porosimetry. The CO2 adsorption affinity, capacity and heat of adsorption were determined by recording high pressure adsorption isotherms at different temperatures, using the gravimetric technique. The separation potential was investigated by means of breakthrough experiments with mixtures of CO2 and N2. The experimental selectivity of CO2/N2 separation was compared to the selectivity as predicted by the Ideal Adsorbed Solution Theory. A drop in capacity was noticed during the experiments and N2 capacities were close to zero or slightly negative due to the very low adsorption, meaning absolute selectivity values could not be determined. However, due to the low N2 capacity, experimental selectivity is estimated to be excellent as was predicted with IAST. While the 3D printing is found to be a practical, fast and flexible route to generate monolithic adsorbent structures, improvements in formulation are required in terms of sample robustness for handling purposes and heat transfer characteristics of the obtained monoliths during gas separation.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.014
      Issue No: Vol. 255 (2017)
       
  • Preparation of nanosized SSZ-13 zeolite with enhanced hydrothermal
           stability by a two-stage synthetic method
    • Authors: Ce Peng; Zhendong Liu; Aoki Horimoto; Chokkalingam Anand; Hiroki Yamada; Koji Ohara; Sohei Sukenaga; Mariko Ando; Hiroyuki Shibata; Takahiko Takewaki; Rino R. Mukti; Tatsuya Okubo; Toru Wakihara
      Pages: 192 - 199
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Ce Peng, Zhendong Liu, Aoki Horimoto, Chokkalingam Anand, Hiroki Yamada, Koji Ohara, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Takahiko Takewaki, Rino R. Mukti, Tatsuya Okubo, Toru Wakihara
      Improving the hydrothermal stability of zeolites promises attractive benefits for catalytic applications, especially in the case of nanosized zeolite. In the present study, a two-stage synthetic method, conducted at low (95 °C) and high (210 °C) temperatures sequentially, was developed to prepare nanosized SSZ-13 zeolite with enhanced hydrothermal stability. The crystal size was tuned within 50–300 nm by simply controlling the period in either stage. In addition, compared with the microsized counterparts, the nanosized SSZ-13 zeolite showed remarkably enhanced hydrothermal stability with exhibiting equivalent catalytic performance in the selective catalytic reduction of NOx by ammonia (NH3-SCR). The improved hydrothermal stability of nanosized zeolite was due to the structural healing by the high temperature treatment.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.042
      Issue No: Vol. 255 (2017)
       
  • Ammonium modified natural clinoptilolite to remove manganese, cobalt and
           nickel ions from wastewater: Favorable conditions to the modification and
           selectivity to the cations
    • Authors: Inocente Rodríguez-Iznaga; Gerardo Rodríguez-Fuentes; Vitalii Petranovskii
      Pages: 200 - 210
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Inocente Rodríguez-Iznaga, Gerardo Rodríguez-Fuentes, Vitalii Petranovskii
      The removal of manganese, cobalt and nickel from industrial ammoniacal wastewaters has been studied using natural Cuban clinoptilolite modified to ammonium form. Favorable conditions to obtain the ammonium-clinoptilolite form (NH4-CLI) were determined from detailed kinetic studies of NH4 + ion-exchange in the clinoptilolite (CLI). Obtained NH4-CLI was characterized by IR spectroscopy and X-ray diffraction. NH4-CLI was used to remove Mn2+, Co2+ and Ni2+ from mixed aqueous solutions. The thermodynamic study on ion-exchange equilibrium between NH4 + in solution and these metallic cations from metal-clinoptilolite forms was performed. Increasing the temperature promotes the NH4 + exchange, which is controlled by the intracrystalline diffusion of ions inside the clinoptilolite. However, the activation energy of this process is not very high. This provides a wide temperature interval for the NH4-CLI efficient production. NH4-CLI removes Co2+ and Mn2+ by ion-exchange selectively at room temperature, being poorly selective to Ni2+, producing a well ions separation. Increasing the temperature greatly enhances the NH4-CLI capacity to remove these metal cations, which is substantially higher to Ni2+. The obtained values for the free energy variation and equilibrium constant lead to outline that the selectivity order of the metal-clinoptilolite forms by NH4 + at room temperature is Mn-CLI > Co-CLI > Ni-CLI. Divergences in the behavior to these exchange processes are associated with difference in the interaction of cations with their ligands in solution as well as into zeolite framework, and accessibility at ion-exchange sites inside clinoptilolite.
      Graphical abstract image

      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.034
      Issue No: Vol. 255 (2017)
       
  • Extra large pore opening CFI and DON-type zeosils for mechanical energy
           storage
    • Authors: Laura Ronchi; Andrey Ryzhikov; Habiba Nouali; T. Jean Daou; Sébastien Albrecht; Joël Patarin
      Pages: 211 - 219
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Laura Ronchi, Andrey Ryzhikov, Habiba Nouali, T. Jean Daou, Sébastien Albrecht, Joël Patarin
      The energetic performances of pure silica CFI and DON-type zeolites (zeosils) were studied by intrusion-extrusion experiments in water and LiCl aqueous solutions at different concentrations. For both zeosils, characterized by a 1D channel system with 14 MR pore openings, when water is used as nonwetting liquid a perfect reversible spring behavior is observed with an intrusion pressure of 75 and 26 MPa, respectively. The lower value for the DON-type structure is probably due to a larger pore aperture. The intrusion pressures in both cases rise considerably with the LiCl concentration, but the doubling of the salt concentration from 10 to 20 M leads only to a slight increase of the intrusion pressure. The maximal stored energy achieves 14.6 and 6.8 J/g for CFI and DON-type zeosil-based systems, respectively. The zeolite samples were characterized before and after intrusion-extrusion experiments by XRD, SEM, N2 adsorption-desorption, TG and NMR analysis in order to get a better understanding of the influence of these intrusion-extrusion experiments on the CFI and DON-type structures.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.039
      Issue No: Vol. 255 (2017)
       
  • Methane hydrate formation in the confined nanospace of activated carbons
           in seawater environment
    • Authors: Carlos Cuadrado-Collados; François Fauth; Ión Such-Basañez; Manuel Martínez-Escandell; Joaquín Silvestre-Albero
      Pages: 220 - 225
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Carlos Cuadrado-Collados, François Fauth, Ión Such-Basañez, Manuel Martínez-Escandell, Joaquín Silvestre-Albero
      Methane hydrate formation studies in saline environment show that activated carbons are excellent host structures able to promote the water-to-hydrate conversion. Under confinement conditions, methane hydrate formation takes place at mild temperatures (−10 °C), low pressures (<6 MPa), with extremely fast kinetics (within minutes) and with a large adsorption capacity (up to 66 wt% CH4 for seawater, i.e. a 128% improvement compared to the dry carbon). Similar studies using ultrapure water give rise to a total methane adsorption capacity of 93 wt%, i.e. entropic effects exerted by salt play a crucial role in the methane hydrate nucleation and growth. Synthesized methane hydrates exhibit a sI crystal structure and a stoichiometry that mimics natural hydrates. These findings open the gate towards the application of activated carbons with a highly developed nanoporous network as host structure for offshore methane storage in marine reservoirs.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.047
      Issue No: Vol. 255 (2017)
       
  • Zeolite ‘adsorption’ capacities in aqueous acidic media; The role of
           acid choice and quantification method on ciprofloxacin removal
    • Authors: Dorcas Zide; Olalekan Fatoki; Ogheneochuko Oputu; Beatrice Opeolu; Simphiwe Nelana; Olatunde Olatunji
      Pages: 226 - 241
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Dorcas Zide, Olalekan Fatoki, Ogheneochuko Oputu, Beatrice Opeolu, Simphiwe Nelana, Olatunde Olatunji
      Zeolites prepared from coal fly ash were used for the ‘adsorptive’ removal of the antibiotic, ciprofloxacin from aqueous solutions. Synthesised zeolites and other standard zeolites were characterised using XRD, FTIR and SEM analysis, to determine their formation, crystalline phase, morphology and elemental composition. The effect of acid type used for pH adjustment on the adsorption behaviour of ciprofloxacin on zeolites was investigated. Residual ciprofloxacin solutions after contact with zeolites were comparatively monitored using UV–Vis spectrometric and LC-MS TOF/DAD chromatographic methods. Results obtained, indicated formation of pure phase low silica zeolites. Removal efficiency by the synthesised zeolites for ciprofloxacin was significantly higher in acetic acid (92–94%) compared to HCl (27–61%) at pH 3 emphasising a clear dependence of results on experimental conditions. At experimental pH, the zeolites underwent chemical changes that were linked to structural changes. The presence of organic substrate during the chemical changes may probably explain side reactions, which led to by-products of organic origin reported in this contribution. FTIR and SEM images are presented after adsorption and clearly showed changes in zeolite structures. A discuss on the use of conventional UV–Vis spectroscopic, and LC-MS-TOF/DAD chromatographic method for quantification of aqueous residual ciprofloxacin after the ‘adsorption’ process is also presented and highlights the shortcomings of the former method compared to the latter. The zeolites showed promise for aqueous ciprofloxacin remediation reducing chemical oxygen demand (COD) levels, with process mechanisms supporting chemical interactions with substrate in a manner similar to degradation reactions.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.033
      Issue No: Vol. 255 (2017)
       
  • Defects in AHFS-dealuminated Y zeolite: A crucial factor for mesopores
           formation in the following base treatment procedure
    • Authors: Cheng Li; Linlin Guo; Peng Liu; Ke Gong; Wenlong Jin; Lei Li; Xiaochun Zhu; Xianchun Liu; Baojian Shen
      Pages: 242 - 252
      Abstract: Publication date: 1 January 2018
      Source:Microporous and Mesoporous Materials, Volume 255
      Author(s): Cheng Li, Linlin Guo, Peng Liu, Ke Gong, Wenlong Jin, Lei Li, Xiaochun Zhu, Xianchun Liu, Baojian Shen
      Mesoporous zeolites have gained a great interest because of their improved performance in catalyzed reactions compared with conventional microporous zeolites. Herein, we would like to report a strategy containing sequential ammonium hexafluorosilicate (AHFS) and base treatment to prepare mesoporous Y zeolite. The obtained mesoporous Y zeolite possessed high total pore volume (0.720 cm3 g−1) and mesopore volume (0.453 cm3 g−1). Furthermore, the goal of well interconnectivity among different pores has also been achieved. It has been found that AHFS treatment played a crucial role in the formation of mesopores during the following base treatment procedure. Si-rich areas, which were full of defects, formed after AHFS treatment. These areas were unstable and easy to remove from the zeolite framework in base solution to generate mesopores. Meanwhile, the defects provided paths for base treatment and made it more effective. The combined treatment achieved a goal of inducing mesopores formation by defects. Catalytic performance of the zeolites were evaluated by cracking of 1,3,5-triisopropylbenzene (TIPB). The result showed that catalytic activity was closely related to the upgraded mesoporosity system of the zeolites.
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      PubDate: 2017-08-03T16:12:25Z
      DOI: 10.1016/j.micromeso.2017.07.046
      Issue No: Vol. 255 (2017)
       
  • Preparation of anhydrous iron fluoride with porous fusiform structure and
           its application for Li-ion batteries
    • Authors: Hongxu Sun; Haochen Zhou; Zhanglin Xu; Jing Ding; Juan Yang; Xiangyang Zhou
      Pages: 10 - 17
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Hongxu Sun, Haochen Zhou, Zhanglin Xu, Jing Ding, Juan Yang, Xiangyang Zhou
      Iron fluorides are drawing the attention of researchers for their high specific capacity as cathode materials of lithium ion batteries. In this work, we focus on the structural adjustment of iron fluorides themselves to improve the electrochemical performances. A kind of porous FeF3 with a fusiform structure has been synthesized by a facile solvothermal method and subsequent heat treatment. The synthetic process of hydrated FeF3 was performed by using simple and economic raw materials (iron salt and HF in absolute ethyl alcohol). The crystal water was removed through a mild drying in air, and porosity is given through the slow dehydration process. Electrochemical performance shows that the as-synthesized porous FeF3 can deliver stable reversible capacities of 137.3 mA g−1 for 100 cycles at 20 mA g−1. Although the specific capacity is moderate among the current research results of iron fluorides, this open porous structure obviously enhance the cycling stability of iron fluorides, and it can be expected to be improved remarkably with further processing.
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      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.033
      Issue No: Vol. 253 (2017)
       
  • Synthesis and characterization of Zr incorporation into highly ordered
           mesostructured SBA-15 material and its performance for CO2 adsorption
    • Authors: Chachchaya Thunyaratchatanon; Apanee Luengnaruemitchai; Thanyalak Chaisuwan; Nuwong Chollacoop; Shih-Yuan Chen; Yuji Yoshimura
      Pages: 18 - 28
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Chachchaya Thunyaratchatanon, Apanee Luengnaruemitchai, Thanyalak Chaisuwan, Nuwong Chollacoop, Shih-Yuan Chen, Yuji Yoshimura
      Zr-SBA-15 materials have been successfully synthesized using the direct synthesis method in self-generated acidic conditions. The diffuse reflectance UV-visible (DRUV-vis) spectra and X-ray photoelectron spectroscopy (XPS) results revealed that most of the zirconium species could be incorporated into silica framework. No agglomeration of Zr species was detected in the silica framework and at the extra-framework. Nevertheless, the continuous diminution of BET surface area, total pore volume, and pore width with increase in Zr/Si molar ratios was distinctly observed, which resulted from the deposition of some tiny and well-dispersed Zr species at the inner pore walls and/or external surface areas. The Zr incorporation also resulted in the augmentation of the microporous characteristics of all materials. The CO2 adsorption measurement was performed under ambient conditions (25 °C and 1 bar) in order to meet the broad needs of industry and household. The largest amount of CO2 uptake was demonstrated by 0.03Zr-SBA-15 at around 0.68 mmol/g (29.92 mg/g). The CO2 adsorption capability of these materials correlated considerably with their textural properties, particularly microporous volume (VMicro).
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      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.015
      Issue No: Vol. 253 (2017)
       
  • Effect of process parameters for production of microporous magnetic
           biochar derived from agriculture waste biomass
    • Authors: K.R. Thines; E.C. Abdullah; N.M. Mubarak
      Pages: 29 - 39
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): K.R. Thines, E.C. Abdullah, N.M. Mubarak
      Durian, which is also known as the king of fruits, is one of the widely consumed fruits in South east Asia, especially in Malaysia, Thailand, Indonesia, Philippines and Singapore. The high demand for durian in Malaysia has led to the accumulation of waste durian rind without proper disposable management in place. Therefore, a novel magnetic biochar was synthesized utilizing the durian rind in the presence of iron oxide, by employing the pyrolysis process in an electrical muffle furnace in a vacuum condition. The effect of pyrolysis temperature, pyrolysis time and sonication frequency was studied to determine the optimum condition for the production of magnetic biochar. The analysis shows that a pyrolysis temperature of 800 °C, pyrolysis time of 25 min and sonication frequency 70 are required for the production of magnetic biochar with a high yield and surface area. These newly produced magnetic biochar have a high surface area of 820 m2/g which provide 98% removal of congo red from the aqueous solution with an adsorption capacity of 87.32 mg/g.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.031
      Issue No: Vol. 253 (2017)
       
  • Mesoporous silica beads containing active and stable tin species for the
           Baeyer-Villiger oxidations of cyclic ketones
    • Authors: Xiaohui Yang; Yanqiu Jiang; Yudong Li; Xianzhu Xu; Defeng Li; Kaifeng Lin
      Pages: 40 - 48
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Xiaohui Yang, Yanqiu Jiang, Yudong Li, Xianzhu Xu, Defeng Li, Kaifeng Lin
      Porous anion-exchange resin was introduced as hard template to hydrothermally synthesize tin-containing mesoporous silica beads (Sn-MesoSB) with the diameter in the range of 0.3–0.9 mm. The characterization results showed the existence of continuous large-mesopore channels and tetrahedral tin species in the bead samples. Sn-MesoSB proved to exhibit high catalytic performances in the Baeyer-Villiger oxidation of adamantanone by using H2O2 as green oxidant, mainly attributed to the enhancement of the access to the catalytic tin sites through the continuous large-mesopore channels. Under the optimized experimental conditions, the conversion of adamantanone approached ca.100% in dioxane for 3 h at 90 °C. Notably, the bead format of such material could be remained during the catalysis procedure, which favors to the straightforward separation from the reaction system without any means of filtration or centrifugation. Working as a liquid-phase heterogeneous catalyst, this is pretty appealing to potential industrial applications. The catalyst was robust and can be reused up to 5 times without significant loss of activity and selectivity, pointing out that the tin species incorporated in the framework possessed high stability. Moreover, the bead material exhibits activity and selectivity in the Baeyer-Villiger oxidations with a broad range of substrates.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.034
      Issue No: Vol. 253 (2017)
       
  • Characterization of pore structures of hydrated cements and natural shales
           by 129Xe NMR spectroscopy
    • Authors: Bing Zhou; Sanna Komulainen; Juha Vaara; Ville-Veikko Telkki
      Pages: 49 - 54
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Bing Zhou, Sanna Komulainen, Juha Vaara, Ville-Veikko Telkki
      129Xe NMR of adsorbed xenon gas is a sensitive tool for the characterization of porous materials. Here we exploit, for the first time, 129Xe NMR to investigate the nanoscale porous structures in hydrated white cements and natural shale. Signals of xenon in mesopores and larger voids are well resolved in the spectra of the cement samples, and the exchange rate between these sites was determined to be 100−300 s−1 at room temperature. The spectra imply that the mesopore size is the smallest and the exchange rate is the highest in the sample with the lowest initial water/cement ratio. The heat of adsorption of xenon in the cements is similar to that in silica gels, about 12 kJ/mol. The shale spectra include a very broad signal, covering a range of about 600 ppm, implying that the adsorbed xenon interacts with the paramagnetic impurities present in the samples.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.038
      Issue No: Vol. 253 (2017)
       
  • A novel strategy to enhance hydrothermal stability of Pd-doped
           organosilica membrane for hydrogen separation
    • Authors: Jiaojiao Lei; Huating Song; Yibin Wei; Shuaifei Zhao; Hong Qi
      Pages: 55 - 63
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Jiaojiao Lei, Huating Song, Yibin Wei, Shuaifei Zhao, Hong Qi
      Pd-doped organosilica (POS) membranes are calcined in N2 and steam atmospheres for hydrogen separation. Chemical compositions and microstructures of the membranes are characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier transform infrared spectra (FTIR) and N2 absorption-desorption measurement. Gas separation performances and hydrothermal stabilities of the membranes are also evaluated and compared. The membrane calcined in steam atmosphere (i.e. POS-S membrane) shows a high H2 permeance (2.5 × 10−7 mol·m−2·s−1·Pa−1) and H2/CO2 permselectivity (9.2, doubles the Knudsen diffusion factor 4.69). Notably, compared with the POS membrane calcined in N2, the POS-S membrane displays more excellent hydrothermal stability throughout a 190-h test, which is superior to most silica-derived membranes reported. The significantly enhanced hydrothermal stability is mainly attributed to the low content of unstable moieties in the POS network after steam calcination. Steam conditions make unstable intermediate Pd oxide transfer into stable PdO and reduce content of inorganic moieties during the calcination, leading to high hydrothermal stability of the membrane. Therefore, calcination in steam atmosphere may offer an effective strategy to develop desirable POS membranes with high separation performances and excellent hydrothermal stabilities for practical hydrogen separation.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.041
      Issue No: Vol. 253 (2017)
       
  • Cytosine-functionalized SBA-15 mesoporous nanomaterials: Synthesis,
           characterization and catalytic applications
    • Authors: Fatemeh Rajabi; Fatemeh Fayyaz; Rafael Luque
      Pages: 64 - 70
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Fatemeh Rajabi, Fatemeh Fayyaz, Rafael Luque
      Periodic mesoporous silica functionalized by cytosine (Cyt@SBA-15) was prepared from Cytosine-chloropropyltriethoxysilane and tetraethoxysilane as precursors by a sol-gel method. The surface area and pore volume of Cyt@SBA-15 were 490 m2/g and 0.77 cm3/g. Due to their porous structure and active functional groups of cytosine on the pore of the hybrid material (Cyt@SBA-15), its catalytic performance was studied in the Knoevenagel condensation of aldehydes and ketones with malononitrile to α, β-unsaturated dicyanides in the presence of ethanol as solvent. The catalyst exhibited an excellent activity and selectivity toward the final condensation product under mild reaction conditions. Furthermore, the catalyst could be recovered and reused several times without any significant loss in either activity or product selectivity.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.043
      Issue No: Vol. 253 (2017)
       
  • Graphene-templated carbon aerogels combining with ultra-high electrical
           conductivity and ultra-low thermal conductivity
    • Authors: Wei Sun; Ai Du; Guohua Gao; Jun Shen; Guangming Wu
      Pages: 71 - 79
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Wei Sun, Ai Du, Guohua Gao, Jun Shen, Guangming Wu
      Nanostructural-strengthened carbon composite aerogels were prepared by sol-gel polymerization of resorcinol (R) and formaldehyde (F) with basic catalyst in graphene oxide (GO) aqueous dispersion. Graphene nanosheets (GNS) as soft anti-shrinkage additive, well incorporated into carbon aerogels (CAs) matrix, significantly reinforce the nanostructural skeleton of CAs and effectively inhibit collapse of nanopores and linear shrinkage during carbonization. By further optimization of loading GO content, the resultant GNS/CAs exhibited high surface areas (as high as 3214 m2 g−1) and a low appearance density of 23.5 mg cm−3 at the same time, which are the highest surface areas for GNC/CAs ever reported. In addition, the resultant composite CAs exhibited high deformation capacitor (∼20.5%), excellent electrical conductivity (2.25 Ω−1 cm−1 at a density of 23.5 mg cm−3), and extremely low thermal conductivity of 0.027 W m−1 K−1, comparable with that of the pristine CAs. Together with the easy handling and outstanding electrical/thermal properties, the resulting materials could have further applications such as thermal insulator for thermal protection system and electrode materials.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.044
      Issue No: Vol. 253 (2017)
       
  • Promising carbon nanosheet-based supercapacitor electrode materials from
           low-grade coals
    • Authors: Tonkeswar Das; Himani Chauhan; Sasanka Deka; Shanky Chaudhary; Ratan Boruah; Binoy K. Saikia
      Pages: 80 - 90
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Tonkeswar Das, Himani Chauhan, Sasanka Deka, Shanky Chaudhary, Ratan Boruah, Binoy K. Saikia
      The abundantly available low-grade coals were efficiently used to produce supercapacitor electrode materials by using wet-chemical methods. The low-grade coals were first chemically converted to graphene-like carbon nanosheets (GCNSs), and then their electrochemical parameters were extensively investigated to know their basic supercapacitor properties. The formation of the GCNSs was established by using scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopic (XPS) techniques. The carbon flakes of the size range of 2–50 μm were found to present in the coal-derived carbon nanomaterials. HRTEM analysis revealed the formation of layered GCNSs along with micropores/mesopores during the oxidative processes. The thermally stabled coal-derived GCNSs were found as promising electrode materials for supercapacitor demonstrating novel charge storage characteristics. The specific capacitance value of ∼125, 84 and 95 F g−1 with high rate capability over 1000 cycles were observed in an acidic electrolyte (H2SO4 1M) with considerably high power density and energy density.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.030
      Issue No: Vol. 253 (2017)
       
  • Recyclable swelling solutions for friendly preparation of pillared
           MWW-type zeolites
    • Authors: Anderson Joel Schwanke; Urbano Díaz; Avelino Corma; Sibele Pergher
      Pages: 91 - 95
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Anderson Joel Schwanke, Urbano Díaz, Avelino Corma, Sibele Pergher
      We studied the recycling of swelling solution of MWW-type lamellar zeolitic precursor with a Si/Al = 25. Swollen materials were obtained up to a third reuse without any compensation of reactants, pH or decrease of lamellar ordering degree. The pillared material showed a surface area of 777 m2 g−1 and mesopores sizes of 2–4 nm characteristic of pillared MWW materials obtained by traditional approaches.
      Graphical abstract image

      PubDate: 2017-07-02T13:47:42Z
      DOI: 10.1016/j.micromeso.2017.06.045
      Issue No: Vol. 253 (2017)
       
  • Heat shock responsive drug delivery system based on mesoporous silica
           nanoparticles coated with temperature sensitive gatekeeper
    • Authors: In-Hye Cho; Man Kyu Shim; Bom Jung; Eun Hyang Jang; Min-Ju Park; Han Chang Kang; Jong-Ho Kim
      Pages: 96 - 101
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): In-Hye Cho, Man Kyu Shim, Bom Jung, Eun Hyang Jang, Min-Ju Park, Han Chang Kang, Jong-Ho Kim
      Mesoporous silica nanoparticles (MSN) have several advantages as carriers for drug delivery, including high drug loading capacity, good biocompatibility, excellent stability, and easily tailorable surface properties. This study describes the design of an MSN-based carrier for use in a heat shock responsive drug delivery system. MSN were functionalized with the temperature-sensitive PEG/PCL multiblock copolymer, as gatekeepers, allowing the release of entrapped drugs in response to heat shock stimuli (MBC-MSN). In the absence of heat shock, doxorubicin (Dox)-loaded MBC-MSN showed very low cytotoxicity, as PEG/PCL inhibited the premature release of Dox from MBC-MSN. In response to heat-shock stimuli, however, these Dox@MBC-MSN showed significant cytotoxicity, similar to that of free Dox. Dox release was due to the loosening of the structure of the gatekeeper, PEG/PCL, in response to the heat shock stimuli. Taken together, these findings suggest that MBC-MSN are a strong candidate to act as a carrier in heat shock responsive drug delivery.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.06.042
      Issue No: Vol. 253 (2017)
       
  • Metal organic framework-supported N-heterocyclic carbene palladium
           complex: A highly efficient and reusable heterogeneous catalyst for
           Suzuki-Miyaura C-C coupling reaction
    • Authors: Mehrnaz Bahadori; Shahram Tangestaninejad; Majid Moghadam; Valiollah Mirkhani; Adam Mechler; Iraj Mohammadpoor-Baltork; Farnaz Zadehahmadi
      Pages: 102 - 111
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Mehrnaz Bahadori, Shahram Tangestaninejad, Majid Moghadam, Valiollah Mirkhani, Adam Mechler, Iraj Mohammadpoor-Baltork, Farnaz Zadehahmadi
      A metal organic framework-supported N-heterocyclic carbene (NHC) was prepared by post-synthetic modification (PSM) of NH2-MIL-101(Cr). The amine group in the NH2-MIL-101(Cr) was modified via condensation with 1,3,5-trichlorotriazine (TCT) providing a precursor that then reacted with N-methylimidazole to produce the MIL-101(Cr)-NH2-bis(NHC). The N-heterocyclic carbene moieties were coordinated with palladium in situ in the porous matrix. The structure of MIL-101(Cr)-NH2-bis(NHC)-Pd (MIL-NHC-Pd) was confirmed by XRD and FT-IR spectroscopy. Electron microscopy was used to characterize the morphology of the resulting material. XPS and ICP confirmed surface composition while Brauner–Emmett–Teller (BET) analysis was used to define the specific surface area. On testing the catalytic activity, cross-coupling reactions of phenylboronic acid and aryl halides proceeded successfully with MIL-NHC-Pd (0.067 mmol Pd/g) as a heterogeneous catalyst. The catalyst was recovered from the reaction mixture by simple filtration and reused for 15 times without leaching into solution or any loss of activity.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.06.048
      Issue No: Vol. 253 (2017)
       
  • Ni-foam-structured NiO-MOx-Al2O3 (M = Ce or Mg) nanocomposite catalyst
           for high throughput catalytic partial oxidation of methane to syngas
    • Authors: Ruijuan Chai; Zhiqiang Zhang; Pengjing Chen; Guofeng Zhao; Ye Liu; Yong Lu
      Pages: 123 - 128
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Ruijuan Chai, Zhiqiang Zhang, Pengjing Chen, Guofeng Zhao, Ye Liu, Yong Lu
      Self-supported NiO-MOx-Al2O3 (M = Ce or Mg) nanocomposites mounted on a Ni-foam (110 PPI) as the monolithic structured catalyst have been developed for the high throughput catalytic partial oxidation of methane to syngas. The catalysts are obtainable by direct growth of NiAl layered double hydroxides nanosheets and subsequent impregnation with boehmite sol containing Al-Ce or Al-Mg nitrates. Such catalysts are highly active and selective with promising stability in the title reaction, for example, the NiO-CeO2-Al2O3/Ni-foam achieves a high methane conversion of 86.4% with 91.2%/89.0% selectivities to H2/CO and is stable for at least 100 h at 700 °C and a high gas hourly space velocity of 100 L g−1 h−1. Thanks to a feasible CeO2↔CeAlO3 chemical cycling that is able to promote the O2 activation to create an oxidative environment around Ni particles, carbon formation rate is dramatically suppressed by a factor of at least 5 compared to the base catalyst.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.07.005
      Issue No: Vol. 253 (2017)
       
  • Microwave-assisted synthesis of Ni, Zn layered double hydroxysalts
    • Authors: Raquel Trujillano; David Nieto; Vicente Rives
      Pages: 129 - 136
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Raquel Trujillano, David Nieto, Vicente Rives
      Layered double hydroxysalts containing Ni2+ and Zn2+ cations and acetate as counterbalancing anions have been synthetised uner microwave irradiation. The samples have been analysed by element chemical analysis, powder X-ray diffraction, FT-IR and Vis-UV spectroscopies, determination of the specific surface area, and thermal analyses. The microwave procedure produces better crystallised materials and faster than by conventional hydrothermal treatment, although when the reaction time under microwave irradiation is prolonged a partial decomposition of the particles is observed.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.06.054
      Issue No: Vol. 253 (2017)
       
  • ECNU-10 zeolite: A three-dimensional MWW-Type analogue
    • Authors: Peng Ji; Ming Shen; Kun Lu; Bingwen Hu; Jin-Gang Jiang; Hao Xu; Peng Wu
      Pages: 137 - 145
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Peng Ji, Ming Shen, Kun Lu, Bingwen Hu, Jin-Gang Jiang, Hao Xu, Peng Wu
      ECNU-10, an analogue of MCM-49 with the 3-dimensional (3D) MWW topology, was synthesized using 1-adamantanamine as structure directing agent (SDA), which is the second example of 3D MWW zeolite obtained by direct hydrothermal synthesis. The synthesis condition was investigated and proton-type ECNU-10 showed similar Al distribution with conventional MCM-22 obtained by the interlayer condensation of a layer precursor, as revealed by 27Al 3Q MAS NMR analysis. The catalytic performance of ECNU-10 was evaluated in the alkylation and disproportionation reactions in comparison to another two MWW-type aluminosilicates of MCM-22 and SSZ-25.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.07.004
      Issue No: Vol. 253 (2017)
       
  • A luminescent metal-organic framework film fabricated on porous Al2O3
           substrate for sensitive detecting ammonia
    • Authors: Jun Zhang; Dan Yue; Tifeng Xia; Yuanjing Cui; Yu Yang; Guodong Qian
      Pages: 146 - 150
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Jun Zhang, Dan Yue, Tifeng Xia, Yuanjing Cui, Yu Yang, Guodong Qian
      A novel metal-organic framework film MIL-124 film was prepared on porous α-Al2O3 ceramic plate by in situ synthesizing. After introducing Eu3+ ions to the free -COOH sites of the MIL-124 ligand channels, a luminescent MOF film MIL-124@Eu 3+ was obtained. Based on the chemical reaction between NH3 and the -COOH, the formation of -COONH4 which was demonstrated by FT-IR spectrum, affected the energy transfer between Eu3+ ions and ligand, quenching the characteristic emission of MIL-124@Eu 3+ film. The limit of detection to ammonia was calculated as 26.2 ppm in ambient air. The XRD results demonstrated the long-term stability of this ammonia sensor. The excellent performance and economical synthesizing strategy of the MIL-124@Eu 3+ film exhibited potential application of this sensor for detecting ammonia gas.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.06.053
      Issue No: Vol. 253 (2017)
       
  • Synthesis of bimodal mesoporous silica with coexisting phases by
           co-hydrothermal aging route with P123 containing gel and F127 containing
           gel
    • Authors: Lina Yang; Haishun Wu; Jianfeng Jia; Bo Ma; Jian Li
      Pages: 151 - 159
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Lina Yang, Haishun Wu, Jianfeng Jia, Bo Ma, Jian Li
      Bimodal mesoporous silica materials with two coexisting phases were synthesized by co-hydrothermal aging (CHA) route. During the CHA process separately prepared P123 containing gel and F127 containing gel were mixed and the mixture underwent the hydrothermal aging together. The silica obtained through co-hydrothermal aging (CHAS) were characterized by XRD, N2 adsorption-desorption, TEM and SEM. CHAS was compared with the silica synthesized with the mixed templates (P123 and F127) through classic liquid crystalline templating route (LCTS). LCTS shows the regular mono-modal cylindrical mesopore, while CHAS shows obvious coexisting semi cubic arranged inkbottle small mesopores (2–5 nm) and hexagonal arranged cylindrical large mesopores (3–7 nm). Effects of synthetic conditions including the stirring time, the pH value and the mass ratio of P123 to F127 were studied in detail. It is found that CHAS can be synthesized within a wide range of stirring time before the mixing of the gels but too long stirring time after mixing will make the pore distribution of CHAS become wide. The mass ratio of P123 to F127 is an effective way to tailor the pore parameters of CHAS. The pH value control (below 3.0) is crucial for the formation of the bimodal mesoporous structure. The synthesis mechanism of the CHAS was suggested, the reaction step in the CHA process is decisive on the pore size of CHAS and the co-hydrothermal aging plays the key role in the formation of CHAS, in this step two phases were weaved together.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.06.037
      Issue No: Vol. 253 (2017)
       
  • Hierarchical zeolite microspheres with flat sheets, wave sheets or
           agglomerates induced by gemini surfactant counterion
    • Authors: Connie K. Liu; Weiyin Xu
      Pages: 160 - 168
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Connie K. Liu, Weiyin Xu
      The solution structure of a gemini surfactant, C22-6-6, associated with various counterions was investigated with small-angle neutron scattering (SANS). Subsequently, C22-6-6 with various counterions (Br−, HC2O4 −, C2O4 2−, CO3 2−, H2PO4 −, HPO4 2− and OH−) was applied as a structure directing agent (SDA) in the synthesis of hierarchical zeolites. C22-6-6 gemini surfactants form robust prolate (rod) micelles that only exhibit small changes in size with varying counterion, concentration, temperature and salt. Hierarchical MFI successfully crystallized with C22-6-6 associated with various counterions as the SDA. The exception was for HC2O4 − and H2PO4 − which lowered the pH of the final synthesis solution. Different SDA counterions engender MFI zeolites with various morphologies, such as flat sheets, wave-like sheets, aggregates, micron sized spheres, and change the mesoporosity, total pore volume and silicon to aluminum ratio.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
      DOI: 10.1016/j.micromeso.2017.07.002
      Issue No: Vol. 253 (2017)
       
  • Laponite functionalized with biuret and melamine – Application to
           adsorption of antibiotic trimethoprim
    • Authors: Beatriz Tiago; Silva Katia Ciuffi Miguel Vicente Raquel Trujillano Vicente
      Abstract: Publication date: 15 November 2017
      Source:Microporous and Mesoporous Materials, Volume 253
      Author(s): Beatriz González, Tiago H. da Silva, Katia J. Ciuffi, Miguel A. Vicente, Raquel Trujillano, Vicente Rives, Emerson H. de Faria, Sophia A. Korili, Antonio Gil
      Laponite-aminosilane hybrid materials have been prepared by reaction of a chlorosilane, (3-chloropropyl)triethoxysilane, with two aminated compounds, namely, biuret and melamine. The resulting compounds were used for the functionalisation of laponite, using two synthesis procedures. The hybrid materials thus formed were fully characterised and tested for the adsorption of the antibiotic Trimethoprim (trimethoxybenzyl-2,4-pyrimidinediamine). The characterisation results showed that functionalisation was successful, and the adsorption experiments showed a high affinity of the hybrid materials for the removal of Trimethoprim, with removal percentages larger than 80%.
      Graphical abstract image

      PubDate: 2017-07-12T11:27:51Z
       
 
 
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