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Adsorption Science & Technology
Journal Prestige (SJR): 0.258

Citation Impact (citeScore): 1
Number of Followers: 9

This is an Open Access Journal

Open Access journal
ISSN (Print) 0263-6174 - ISSN (Online) 2048-4038
Published by Sage Publications

[1176 journals]

Removal of caffeine from aqueous solution by green approach using Ficus
Benjamina zero-valent iron/copper nanoparticles
- Authors: Hossam Mohammed Abdel-Aziz, Rabie Saad Farag, Soha Ali Abdel-Gawad
  Pages: 325 - 343
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 325-343, December 2020.
  Green synthesis approach was successful used extract was successful in preparing bimetallic zero-valent Iron/Copper nanoparticles [FB-nZVFe/Cu]. Scanning Electron Microscope [SEM], Fourier Transform Infrared Spectroscopy [FTIR], and Dispersive X-ray Spectroscopy [EDX] showing the synthesizing of FB-nZVFe/Cu. The removal efficiency of Caffeine [5 mg L−1] reached 86% under the conditions [0.2 g L−1, 45 min, and pH 5]. The adsorption data are more appropriate by the Langmuir model [R2 = 0.9987] with qmax = 34.34 mg g −1. Kinetic results showed that Caffeine uptake is following pseudo-second-order. Langmuir and pseudo-second-order are more appropriate in linear and non-linear models. Overall, FB-Fe/Cu is a committed green substance for removal Caffeine from aqueous solutions. Functional parameters affect investigated using the Linear regression analysis, we found them to account for over 98% of the variables affecting the removal procedure.
  Citation: Adsorption Science & Technology
  PubDate: 2020-08-10T04:59:27Z
  DOI: 10.1177/0263617420947495
  Issue No: Vol. 38, No. 9-10 (2020)
Adsorption behaviors on trace Pb2+ from water of biochar adsorbents from
konjac starch
- Authors: Yinhui Li, Longfei Peng, Weixin Li
  Pages: 344 - 356
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 344-356, December 2020.
  Biochar adsorbents used to treat different heavy metals in water are efficient and low-cost. Appropriate raw materials, excellent selectivity and detailed adsorption mechanism are of important for research on biochar adsorbents. In this work, konjac starch was dispersed in polyvinylpyrrolidone (PVP) solution to prepare different sizes hydrophilic carbon spheres (HCSs) by hydrothermal synthesis method. Adsorption kinetics of the HCSs towards Pb2+ is described perfectly by the pseudo-second-order equation. With the temperature increasing, adsorption thermodynamics are more consistent with the Freundlich model. The calculated ΔG, ΔH and ΔS shows the adsorption of the HCSs towards Pb2+ is a spontaneous, endothermic and entropy increase process. In addition, HCSs have excellent selectivity for the adsorption of Pb2+ and Cu2+. HCSs prepared from konjac starch make full use of natural biomass resources, they can be used as a potential adsorbent material in treatment on heavy metal ion from water field.
  Citation: Adsorption Science & Technology
  PubDate: 2020-08-17T11:14:13Z
  DOI: 10.1177/0263617420948699
  Issue No: Vol. 38, No. 9-10 (2020)
Experimental investigation of the functional mechanism of methane
displacement by water in the coal
- Authors: Bingxiang Huang, Weiyong Lu, Shuliang Chen, Xinglong Zhao
  Pages: 357 - 376
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 357-376, December 2020.
  During hydraulic fracturing in a high-methane coal seam, there is a water-displacing-methane effect. A pseudo triaxle experimental system, which is opposite to the name of true triaxial system, for the water-displacing-methane effect was created. First, cylindrical coal samples in a methane adsorption equilibrium state, spontaneously desorbed. And then water was injected into the coal samples. The following was shown: (1) The displacement methane volume gradually rises with an increase of injected water, while the displacement methane rate tends to rise at first before declining later. Simultaneously, the water-displacing-methane process is characterised by a time effect. The methane displacement lags behind water injection. (2) Competitive adsorption and displacement desorption between the water and methane will promote adsorption methane into free methane, while the pore pressure increase caused by water injection will turn free methane into adsorption methane. The net free methane of the combination action provides a methane source for the water-displacing-methane effect. (3) A pore pressure gradient, which provides a power source for the water-displacing-methane effect, is formed and reduces gradually at the front of the water seepage along the seepage direction. The increase in water pressure can rapidly improve the pore pressure gradient and boost the displacement methane volume as well as improve displacement methane efficiency. (4) A starting porosity pressure gradient and limit pore pressure exist in the process of water-displacing-methane. When the pore pressure gradient is less than the starting pore pressure gradient, there is free methane in the coal rock, but it cannot be displaced. When the pore pressure is between the starting pore pressure and the limit pore pressure, the free methane can be displaced. When the pore pressure is greater than the limit pore pressure, the methane is almost completely adsorption methane, and water cannot be used to displace the free methane.
  Citation: Adsorption Science & Technology
  PubDate: 2020-08-17T09:31:03Z
  DOI: 10.1177/0263617420948700
  Issue No: Vol. 38, No. 9-10 (2020)
Effect of carbonization temperature on characterization and water vapor
adsorption of coffee-shell activated carbon
- Authors: Shengnan Sun, Qiongfen Yu, Ming Li, Hong Zhao, Yunfeng Wang, Xu Ji
  Pages: 377 - 392
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 377-392, December 2020.
  Coffee shells, which are abundant in cellulose and lignin, are good raw materials to prepare activated carbon. In this paper, coffee shells were selected as raw materials for activated carbon preparation by KOH chemical activation. Influence of carbonization temperature on adsorption capacity of water vapor over activated carbon was researched. Thermogravimetric analysis was employed to select the scope of carbonization temperature. Activation energies of coffee shells pyrolyzed at different heating rates were calculated. Nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM) were adopted to characterize the activated carbon. And water vapor adsorption isotherms were simulated by the finite simplification model of Do-Do adsorption model. The results show that activation energies of coffee shells pyrolysis process with heating rates of 5, 10 and 20 K/min are 17.21, 18.01 and 57.52 kJ/mol, respectively. The optimal carbonization temperature of coffee shells is 923 K. The adsorption amount of water vapor can reach about 702.3 mg/g under experiment temperature of 298 K and relative humidity of 70%. The highest total pore volume and Brunauer–Emmett–Teller (BET) specific surface area are 1.41 cm3/g and 2817 m2/g, respectively. The simulation results of the finite simplification model are consistent well with water vapor adsorption experiment results. The results show that activated carbon prepared at the optimal condition would be the potential candidate for solar drying system.
  Citation: Adsorption Science & Technology
  PubDate: 2020-08-19T06:46:44Z
  DOI: 10.1177/0263617420950994
  Issue No: Vol. 38, No. 9-10 (2020)
Liquid CO2 phase transition fracturing technology and its application in
enhancing gas drainage of coal mines
- Authors: Yingchun Fan, Botao Qin, Qun Zhou, Quanlin Shi, Dong Ma, Jiahao Wu
  Pages: 393 - 412
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 393-412, December 2020.
  Liquid CO2 phase transition fracturing (LCO2-PTF) is an effective and economical technology used to improve the permeability of rock and coal. In this study, the working mechanisms of LCO2-PTF were analysed and relevant equipment was designed to develop and promote the application of this technology. It utilized phase transition equipment (PTE) consisting of a liquid gas container, control unit for the current and gas volume, heating tube, and other components. LCO2 blasting experiments were conducted in an airtight container to investigate the released energy, pressure, and other technical parameters. The application of LCO2-PTF for enhancing gas drainage in coal mines was then evaluated. The results of a blasting experiment showed a maximum energy of 947.12 kJ and revealed that the releasing pressure could be easily changed by varying the plate and heat tube. The releasing pressure remained unchanged within an initial distance and then decreased exponentially. The blasting products were gaseous CO2 and water vapor, with no sparks or flames. The surface temperature of the PTE ranged from 269.32 to 277.96 K. Application of LCO2-PTF in coal mines with low permeability showed gas drainage 3.38 times higher than that achieved with conventional technologies, with methane concentration increasing from 55 to 89%. The attenuation coefficient of gas emissions dropped by 94% and the gas permeability coefficient of the coal body increased more than 23 times after fracturing. The shockwave of the high-pressure gas promoted the development and extension of cracks. The influence radius of the pre-cracking coal seam was 8.1 m, which is 6.75 times that of the original coal seam. The experimental results and the engineering applications indicate that LCO2-PTF is a safe and effective technology to enhance gas drainage in coal mines.
  Citation: Adsorption Science & Technology
  PubDate: 2020-08-26T07:16:27Z
  DOI: 10.1177/0263617420952563
  Issue No: Vol. 38, No. 9-10 (2020)
Cr(VI) adsorption from aqueous streams on eggshell membranes of different
birds used as biosorbents
- Authors: Jessica Badillo-Camacho, Eulogio Orozco-Guareño, Gregorio G Carbajal-Arizaga, Ricardo Manríquez-Gonzalez, Icela D Barcelo-Quintal, Sergio Gomez-Salazar
  Pages: 413 - 434
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 413-434, December 2020.
  The discharges enriched with heavy metals, particularly Cr(VI), are a serious environmental problem. In this work, it is presented the use of biosorbents from eggshells membranes of ostrich, quail, duck and chicken; the membranes were easily prepared and studied for the removal of Cr(VI) from aqueous solutions. Maximum uptake of 1.41 mmol g−1 membrane permitted the identification of ostrich membrane as the material with the highest Cr(VI) uptake. N2 adsorption experiments permitted to classify ostrich membranes as mesoporous materials, since they had pore size of 14.8 nm. This represented an advantage on the nature of these membranes to be used as biosorbents with respect to other membranes. The adsorption isotherm models such as Langmuir and Freundlich were verified using experimental data. Langmuir model described the adsorption process satisfactorily at pH 1 and 2 whereas Freundlich model fitted data better at pH 3 and 5. The adsorption kinetic data were adjusted to a pseudo-second order kinetic model. TGA results permitted demonstrating a low thermal stability of ostrich membrane, since it starts decomposing at around 50°C due to the fact that membranes have about 60% protein. Through SEM microscopy was possible to observe the morphology of the membrane surfaces before and after Cr(VI) uptake which reflects the textural characteristics of the biosorbent. FTIR and XPS analyses suggested that Cr was adsorbed on ostrich membranes through the amine groups of proteins conforming the fibers of membranes. Despite the oxygen shows higher electronegativity than N, Cr shows more preference toward N due to fact that pH conditions favor the positive charges on the surface of the membrane. Our results make evident that this waste material is a novel and efficient option for the removal of Cr(VI) from aqueous solutions.
  Citation: Adsorption Science & Technology
  PubDate: 2020-09-10T12:35:56Z
  DOI: 10.1177/0263617420956893
  Issue No: Vol. 38, No. 9-10 (2020)
Critical flocculation concentration for polyvalent ions using silica
nanoparticles; a new version of Schulze-Hardy rule
- Authors: Rogelio Rodriguez, Susana Vargas
  Pages: 435 - 449
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 435-449, December 2020.
  Critical Flocculation Concentration (CFC) is an important quantity because allows to know the optimal amount of flocculant required to remove (adsorb) specific quantities of metal ions in aqueous solution allowing to reduce both, the flocculation time and the excess of unreacted flocculant; this unreacted material produces, by itself, an additional contamination. The results reported here show that the standard Schulze-Hardy-Rule (SHR), based only in the valence z, is not longer valid to obtain the right values of CFC. In this work it is reported a correct determination of CFC for di- and tri-valent ions using different types of silica nanoparticles. Both, the initial pH slope (-pHo) and the valence z are required to determine correctly the CFC. The proposed modified version for CFC is CFC ∝ [(-pHo)z]−1.
  Citation: Adsorption Science & Technology
  PubDate: 2020-09-22T08:00:33Z
  DOI: 10.1177/0263617420957827
  Issue No: Vol. 38, No. 9-10 (2020)
Characterization and comparison of walnut shells-based activated carbons
and their adsorptive properties
- Authors: Xiya Li, Jieqiong Qiu, Yiqi Hu, Xiaoyuan Ren, Lu He, Nannan Zhao, Ting Ye, Xueqin Zhao
  Pages: 450 - 463
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 450-463, December 2020.
  The production of low-cost biologically activated carbons (BACs) is urgent need of environmental protection and ecological sustainability. Hence, walnut shells were treated by traditional pyrolysis, direct KOH impregnation and combined activation composed of hydrothermal carbonization and two-step H3PO4- and pyrolysis-activation process to obtain porous carbon with high adsorption capacity. It was found that the best adsorption capacity for iodine and organic dye methylene blue (MB) can be obtained using the KOH impregnation at impregnation ratio of 1:1 or combined activation comprising of 2 h H3PO4 activation and 1 h pyrolysis activation at 1000°C. The produced KOH, H3PO4/pyrolysis activated BACs at the optimum conditions are superior to that of commercial ACs, 9.4 and 1.3 times for MB removal, 4 and 4.5 times for iodine number respectively. Characterization results demonstrated their porous structure with very good textural properties such as high BET surface area (1689.1 m2/g, 1545.3 m2/g) and high total pore volume (0.94 cm3/g, 0.96 cm3/g). The N2 adsorption-desorption isotherm of H3PO4/pyrolysis activated hydrochar suggested the co-existence of micro and meso-pores. Moreover, they are more effective for the removal of Fe(III) and Cr(VI) from aqueous solution than the commercial AC, suggesting a promising application in the field of water treatment.
  Citation: Adsorption Science & Technology
  PubDate: 2020-09-10T12:35:26Z
  DOI: 10.1177/0263617420946524
  Issue No: Vol. 38, No. 9-10 (2020)
Removal of brilliant green (BG) by activated carbon derived from medlar
nucleus (ACMN) – Kinetic, isotherms and thermodynamic aspects of
adsorption
- Authors: Moussa Abbas
  Pages: 464 - 482
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 464-482, December 2020.
  Experimental investigations were undertaken to adsorb Brilliant Green (BG) a toxic dye from aqueous medium using activated carbon derived from the medlar nucleus (ACMN). The adsorption was used to remove BG using ACMN as bio-adsorbent to replace activated carbon still expensive. The prepared adsorbent was characterized by the BET surface area measurement, FTIR spectroscopy and X-ray diffraction. Various parameters such as the initial dye concentration (110–200 mg/L), adsorbent dose (1–6 mg/L), initial pH (2–9) and temperature (298–318 K) were studied to observe their effects on the BG adsorption. Batch studies were conducted in order to determine the optimal parameters required to reach the adsorption equilibrium. The maximum adsorption capacity of ACMN for the BG adsorption at 298 K was found to be 833.15 mg/g. The adsorption kinetic data were analyzed by using several kinetic models namely the pseudo-first-order, pseudo-second-order, Elovich equation, intraparticules diffusion model. It was established that the adsorption obeys the pseudo-second-order kinetic model. The evaluation of thermodynamics parameters such as the free energy ΔG° (−10.584 to −6.413 kJ/mol), enthalpy ΔH° (36.439 kJ/mol) and the change of entropy (0.1438 kJ/mol K) indicated a spontaneous and endothermic nature of the reaction with a chemisorption process. The present adsorbent may be considered as an alternative for the better performance of the BG removal from aqueous medium.
  Citation: Adsorption Science & Technology
  PubDate: 2020-09-11T08:51:05Z
  DOI: 10.1177/0263617420957829
  Issue No: Vol. 38, No. 9-10 (2020)
Synthesis Fe3O4/Talc nanocomposite by coprecipition-ultrasonication method
and advances in hexavalent chromium removal from aqueous solution
- Authors: Nguyen Thi Huong, Nguyen Ngoc Son, Vo Hoang Phuong, Cong Tien Dung, Pham Thi Mai Huong, Le Thanh Son
  Pages: 483 - 501
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 483-501, December 2020.
  The Fe3O4/Talc nanocomposite was synthesized by the coprecipitation-ultrasonication method. The reaction was carried out under a inert gas environment. The nanoparticles were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), fourier-transform infrared spectroscopy (FT-IR) and vibrating sample magnetometry techniques (VSM), the surface area of the nanoparticles was determined to be 77.92 m2/g by Brunauer-Emmett-Teller method (BET). The kinetic data showed that the adsorption process fitted with the pseudo-second order model. Batch experiments were carried out to determine the adsorption kinetics and mechanisms of Cr(VI) by Fe3O4/Talc nanocomposite. The adsorption process was found to be highly pH-dependent, which made the material selectively adsorb these metals from aqueous solution. The isotherms of adsorption were also studied using Langmuir and Freundlich equations in linear forms. It is found that the Langmuir equation showed better linear correlation with the experimental data than the Freundlich. The thermodynamics of Cr(VI) adsorption onto the Fe3O4/Talc nanocomposite indicated that the adsorption was exothermic. The reusability study has proven that Fe3O4/Talc nanocomposite can be employed as a low-cost and easy to separate.
  Citation: Adsorption Science & Technology
  PubDate: 2020-10-27T08:04:59Z
  DOI: 10.1177/0263617420969112
  Issue No: Vol. 38, No. 9-10 (2020)
Determination of the sensitivity index and its critical value for outburst
risk prediction: A case study in Fuxiang mine, China
- Authors: Fakai Wang, Yunpei Liang, Zhongguang Sun, Lei Li, Xuelong Li
  Pages: 502 - 527
  Abstract: Adsorption Science & Technology, Volume 38, Issue 9-10, Page 502-527, December 2020.
  Gas occurrence in coal seams shows zonation, and the outburst risk prediction index is significantly affected by coal seam gas. For different coal mine, the sensitivity of prediction index of outburst risk is inconsistent, and the different area of the same coal mine can present different sensitivities to the same index. In this study, we measured the industrial analysis of coals and determined the degree of outburst risk of each coal seam using coal samples with the particle size of 1 ∼ 3 mm. The relationships between the equilibrium gas pressure and gas desorption index of drill cuttings, between the desorption index of drill cuttings and the adsorption pressure, and between the critical values of the indexes of drill cuttings were also analyzed using the fuzzy clustering method. Based on the analysis of the particle size distribution of coal samples, the influence of grain size on the critical value of the drill cuttings desorption index was studied. The results showed that the critical values of the desorption index of drill cuttings were different under different adsorption equilibrium gas pressures, and those critical values increased with increasing adsorption equilibrium gas pressure. The desorption index of drill cuttings and adsorption equilibrium gas pressure had a linear relationship, and the higher the degree of outburst risk was, the greater the slope of the fitting function and the smaller the intercept; under the same gas pressure of adsorption equilibrium, there was a linear relationship between Δh2 and K1, and the higher the outburst risk of coal seam was, the smaller the slope of the fitting function and the greater the intercept. The drill cuttings desorption index Δh2 was more sensitive than the index K1. Under the same test pressure, the smaller the particle size of the coal samples was, the greater the value of desorption index of drill cuttings and the higher the outburst risk of coal seam. The research results have significant theoretical importance and practical value for the prediction and prevention of coal and gas outbursts in coal mines with similar occurrence conditions of coal seams.
  Citation: Adsorption Science & Technology
  PubDate: 2020-10-09T11:42:09Z
  DOI: 10.1177/0263617420963735
  Issue No: Vol. 38, No. 9-10 (2020)