Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 30)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 8)
ACS Catalysis     Hybrid Journal   (Followers: 52)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 23)
ACS Combinatorial Science     Hybrid Journal   (Followers: 21)
ACS Environmental Au     Open Access   (Followers: 9)
ACS Macro Letters     Hybrid Journal   (Followers: 25)
ACS Materials Letters     Open Access   (Followers: 2)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 42)
ACS Nano     Hybrid Journal   (Followers: 182)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 30)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 8)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 7)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 71)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 3)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 6)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 109)
Advances in Chemical Science     Open Access   (Followers: 51)
Advances in Chemistry     Open Access   (Followers: 34)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 33)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 51)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Sample Preparation     Open Access   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Chemical Education     Open Access   (Followers: 5)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 2)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 4)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 43)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 19)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 152)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 229)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access  
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 201)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 23)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 90)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 66)
Bioorganic Chemistry     Hybrid Journal   (Followers: 9)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 12)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Carbohydrate Research     Hybrid Journal   (Followers: 24)
Carbon     Hybrid Journal   (Followers: 65)
Carbon Capture Science & Technology     Open Access  
Carbon Trends     Open Access   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal  
Chem Catalysis     Hybrid Journal  
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 81)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Physics Impact     Full-text available via subscription  
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 169)
Chemical Science     Open Access   (Followers: 39)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 2)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 54)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 22)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 121)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 19)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 6)
Chemistry Education Review     Open Access   (Followers: 1)
Chemistry in Education     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 162)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 8)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comptes Rendus : Chimie     Open Access  
Comptes Rendus : Physique     Open Access   (Followers: 2)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Comptes Rendus : Chimie
Journal Prestige (SJR): 0.438
Citation Impact (citeScore): 2
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1631-0748 - ISSN (Online) 1878-1543
Published by Académie des sciences Homepage  [7 journals]
  • t -butanol+to+biofuel+additives+over+AlPO+solid+acid+catalyst+under+microwave+irradiation+technique:+kinetic+study&rft.title=Comptes+Rendus+:+Chimie&rft.issn=1631-0748&rft.date=2022&rft.volume=">K. Shyam Prasad; S. Z. Mohamed Shamshuddin - Highly efficient conversion
           of glycerol and t -butanol to biofuel additives over AlPO solid acid
           catalyst under microwave irradiation technique: kinetic study

    • Abstract: Metal-aluminophosphate solid acids (m-AlPO) were prepared and characterized by various techniques such as powder-XRD, FT-IR, BET surface area, SEM, TEM, EDAX, NH 3 -TPD/n-butylamine back titration and ICP-OES techniques. These materials were used as catalysts in liquid phase etherification reaction of glycerol with alcohol. In order to obtain good yield of the reaction product, optimization reaction was carried out by varying time, temperature, catalyst weight and molar ratio of reactants. CuAlPO solid acid showed superior performance in a short period of time with 95% glycerol conversion and 68% selectivity to higher ethers (di and tri). The catalytic activity was investigated by three heating techniques (microwave, ultrasonic and conventional). The pre-adsorption experiment obeys the Langmuir–Hinshelwood type mechanism. Kinetic studies were also carried out to determine the activation energy (E a ) and temperature coefficient (T c ) of the catalyst. The catalyst was reused for several reaction cycles without much loss of catalytic activity.
      PubDate: Wed, 18 May 2022 13:05:49 +000
       
  • Fabien Olivier; Ange A. Maurice et al. - Liquid–liquid extraction:
           thermodynamics–kinetics driven processes explored by microfluidics

    • Abstract: Les procédés d’extraction liquide-liquide, caractérisés en ligne par une plate-forme microfluidique instrumentée, améliorent considérablement le développement de modèles thermodynamiques prédictifs, tels que la iénaïque, et posent les bases de nouvelles approches qui ont pour but d’améliorer les modèles cinétiques qui combinent transport et chimie. La microfluidique permet de mesurer avec précision les énergies libres de transfert des espèces à l’équilibre ainsi que leurs temps caractéristiques de transfert associés, et ce de manière plus rapide et plus précise qu’en méthode batch. Contrôlée par ordinateur et entièrement automatisée, notre plate-forme a été utilisée pour illustrer les fortes différences cinétiques d’extraction de l’ytterbium (Yb) et du fer (Fe), deux éléments pointés pour leur efficacité d’extraction très différente en raison de différentes forces moléculaires rivalisant avec la complexation lorsque des modificateurs sont mis en jeu avec des molécules extractantes. Une fois collectées et traitées, les données cinétiques montrent deux comportements distincts concernant ces deux éléments métalliques : selon la température, Fe peut présenter un profil d’extraction très lent par rapport à Yb.
      PubDate: Wed, 18 May 2022 13:05:49 +000
       
  • Carmen-Simona Jordan (Asaftei) - Manufacturing of ultra-thin redox-active
           polymer films using the layer-by-layer method and co-polymerization of
           vinyl viologen units

    • Abstract: The current study presents the principle of a new approach to fabricating redox-active polymers film on mesoporous TiO 2 electrodes. This new strategy involves the top-down approach (adsorption) combined with bottom-up layer-by-layer (LbL) crosslinking and “in situ” co-polymerization reactions. This approach uses 4,4 ′ -bipyridinium units, so-called viologen with an anchoring phosphono ethyl acid and the vinyl group as building blocks molecules, and 1,3,5-tris-(bromomethyl) benzene as crosslinker. Crosslinking and co-polymerization reactions lead to the growth of the concentration of redox species on the surface and increased stability of the colored areas towards forced desorption in water. The method offers a simple, versatile way to manufacture nanostructured functional materials.
      PubDate: Wed, 18 May 2022 11:33:20 +000
       
  • Gabriela Ungureanu; Oana Alexandra Pătrăuţanu et al. - A bio-based
           

    • Abstract: Spruce bark, a waste from forestry and wood industry, represent a valuable resource. Subjected to biorefinery, this feedstock leads to separation of extractibles and final conversion products. The main final product is biochar, a rich carbon material that could be efficient in environmental remediation. This study assessed the lead uptake capacity of biochar. The total Pb uptake was a quite fast process (120 min), for a sorbent dose of 0.25 g/L and pH 5. The kinetic was properly described by pseudo-second-order model. Further developments are open considering activation/functionalization of biochar as well as other hazardous pollutants and competitors’ uptake.
      PubDate: Wed, 18 May 2022 11:33:20 +000
       
  • Mariem Charbti; Claude Fortin et al. - Dealuminated heated clay as new
           fluoride adsorbent for treatment of contaminated drinking water

    • Abstract: The present study aims to reduce the fluoride concentration of drinking water using a novel mild adsorbent based natural clay. The natural clay was dealuminated/realuminated and dehydroxylated by intense washing and heating processes. The developed adsorbent was confirmed by X-ray diffraction (XRD), thermal analyses (ATD-TG) and nuclear magnetic resonance solid-state with magic angle spinning (MAS NMR). MAS NMR results showed that distorted tetrahedral-Al coordination and penta-Al coordination sites were responsible for fluoride adsorption. Batch adsorption experiments were investigated without any adjustment of water pH. The effect of the clay dosage over the range of 0.5–2 g/50 mL of sample solution was studied. Results revealed that the aggregation of the clay particles in the water was successfully avoided thanks to the heating process. Kinetics and adsorption isotherms were also investigated. The adsorption equilibrium was achieved on a timescale of seconds. Adsorption kinetics data followed pseudo-first-order as well as pseudo-second-order models while isotherm experimental data followed the Freundlich model. The maximum adsorption capacity was relatively small (1.2 mg·g -1 ). Tests performed on Tunisian contaminated drinking water showed that water potability with respect to fluoride was successfully achieved; suggesting that the dealuminated/realuminated dehydroxylated clay can be a promising fluoride adsorbent for drinking water.
      PubDate: Wed, 18 May 2022 11:33:20 +000
       
  • Shuang Tao; Zhang Li et al. - Enhanced transesterification of rapeseed oil
           to biodiesel catalyzed by KCl/CaO

    • Abstract: A series of supported solid base catalysts were prepared by impregnation of chloride salts over CaO. The catalytic activity of the prepared catalysts was tested for the transesterification reaction of biodiesel from rapeseed oil and methanol. The KCl/CaO catalyst containing 15% KCl exhibited the highest catalytic activity after calcination at 600 °C for 6 h. A reaction optimization study was carried out using KCl/CaO as catalyst leading to operation conditions for achieving a 98.3% yield of fatty acid methyl ester (FAME) at 2.5 h and 65 °C, a catalyst amount of 10%, and a mole ratio of methanol to rapeseed oil of 15:1. It was found that the highest FAME yield at 2.5 h was faster than that at 6 h for commercial CaO catalysts under the same reaction conditions. The characterization results showed that the pore size of CaO particles was greatly improved by the addition of KCl, which facilitated better access of the reactive molecules to the active sites of the catalyst.
      PubDate: Mon, 16 May 2022 11:52:35 +000
       
  • Hafedh Belmabrouk; Marwa Selmi et al. - Cationic dye removal using
           Pergularia tomentosa L. fruit: kinetics and isotherm characteristics using
           classical and advanced models

    • Abstract: The agricultural crops prove to be low-cost and abundant biosorbents that are able to adsorb dyes from contaminant water. In the present study, different techniques were used to characterize the powdered Pergularia tomentosa fruit. After that, the biomaterial was exploited to investigate the adsorption of methylene blue in batch mode. The effects of initial pH, contact time, dye concentration, biosorbent dose, and temperature on the biosorption capacity have been performed. The fit of the adsorption isotherms was performed by means of several classical models and advanced models derived from statistical physics. The two-energy monolayer model proves to be the more suitable. It appears that two functional groups of the biosorbent are involved in the dye biosorption. The adsorption energy ranges from 14 to 18 kJ·mol -1 which indicates a physiosorption mechanism. The maximum adsorption capacity is 152 mg·g -1 . Pergularia tomentosa fruit proves to be attractive for the efficient removal of cationic dyes from polluted water.
      PubDate: Wed, 04 May 2022 07:34:17 +000
       
  • Liliana Lazar; Heinz Koeser et al. - Comparative kinetics study of the
           catalytic oxidation of benzene and its mono-halogenated derivatives over V
           2 O 5 –WO 3 /TiO 2 catalyst

    • Abstract: The SCR-DeNOx commercial catalysts are reported as possible candidates to remove aromatic VOCs and NO x simultaneously. In this paper, we present the kinetic studies of the oxidation of benzene and its mono-halogenated derivatives over V 2 O 5 –WO 3 /TiO 2 catalyst as typical high-dust SCR-DeNOx system. The kinetic investigation follows the influence of temperature on the conversion of aromatic VOCs to establish the apparent energy activation and dependence on between temperature and the effective constant rate of the catalytic oxidation reaction. The data shows that the catalytic oxidation process takes place after a combined kinetic mechanism, mass transport through pores—chemical transformation.
      PubDate: Tue, 03 May 2022 11:48:24 +000
       
  • Georgiana Mardare (Balusescu); Liliana Lazar et al. - Spectroscopic
           investigation and chemical fingerprint of Datura innoxia dry biomass

    • Abstract: In this study it is presented the application of spectroscopic methods, such as fluorescence study and attenuated total reflection Fourier transform infrared analysis for identification and detection of secondary metabolite specially, hyoscine, and organic functional groups from dry biomass of Datura innoxia vegetative organs. The experimental results confirmed the presence of some important classes of secondary metabolites useful in medicine domain, e.g., alkaloids, terpenes, phenolics, sterols, carbohydrates. Regarding fluorescence study, maximum excitation wavelengths for hyoscine were found to be 345 nm (1-butanol and ethanol). Moreover, the results showed the presence of hyoscine in all structural units which is in according with other studies.
      PubDate: Tue, 03 May 2022 11:48:24 +000
       
  • Elena-Florentina Grosu; Elena Seftel et al. - Efficient degradation and
           mineralization of diclofenac in water on ZnMe (Me: Al; Co; Ga) layered
           double hydroxides and derived mixed oxides as novel photocatalysts

    • Abstract: L’élimination du diclofénac (DCF) de solutions aqueuses a été étudiée en utilisant des processus photocatalytiques, en utilisant une série de nouveaux photocatalyseurs basés sur d’hydroxydes doubles lamellaires ZnMe (Me : Al ; Co ; Ga) (LDH) et leurs oxydes mixtes dérivés. Les catalyseurs ont été caractérisés à l’aide de techniques spécifiques. Par irradiation en lumière solaire, les catalyseurs ZnCo et ZnGa ont dégradé presque complètement le DCF de l’eau, tandis que la minéralisation, exprimée par l’élimination totale du carbone organique, a atteint ∼85%. Les mécanismes de dégradation de la photolyse du DCF et de la dégradation photocatalytique sous irradiation solaire et UV ont été étudiés.
      PubDate: Tue, 03 May 2022 11:48:24 +000
       
  • Mariana Zavagna-Witt; Nazir Tahir et al. - Synthesis of
           exopolysaccharide-based organo-montmorillonite with improved affinity
           towards carbon dioxide and hydrophilic character

    • Abstract: Grafting of a bio-sourced exopolysaccharide (EPS) using a disulfide ethyl moiety with two ammonium ends as interface on Na + -exchanged montmorillonite (NaMt) turned out to be a “green” route to produce an OH-enriched organoclay with improved affinity towards CO 2 and moisture. Characterization through X-ray diffraction, infrared spectroscopy and thermogravimetric analysis revealed an organized structure with an increased basal spacing that facilitates the diffusion of CO 2 and water molecules and thermal stability up to 190 °C. Measurements through thermal programmed desorption (TPD) showed that at least 16 CO 2 molecules are adsorbed per OH group incorporated via HO:CO 2 interactions between CO 2 molecules and both EPS, and adsorbed water molecules. Adsorbed CO 2 can be completely released below 190 °C. This opens promising prospects for designing respiratory devices that support vegetal-derived moieties that can capture non-stoichiometric amounts of CO 2 in CO 2 -rich gas mixtures and enclosures with non-thermal regeneration.
      PubDate: Tue, 03 May 2022 11:48:24 +000
       
  • Radia Sennour; Diana Pricop et al. - Optimized diffusion–convection
           compromise for reversible CO 2 capture on hydroxylated
           organo-montmorillonite

    • Abstract: Carbon dioxide (CO 2 ) was reversibly captured at room temperature and normal pressure by a low cost hybrid absorbent (NaMt-H30) obtained through Na-montmorillonite intercalation with Boltorn dendrimer H30 (1 wt%). Measurements through thermal programmed desorption between 20 °C and 200 °C showed variations of the retention capacities of CO 2 (CRC) and water (WRC) according to the nitrogen stream throughput, contact time and injected CO 2 amount for adsorbent saturation. CRC and WRC modeling as functions of these parameters was achieved using a 3 3 factorial design involving 27 attempts. Model analysis revealed that the retention of CO 2 and water molecules depend not only on the individual effects of each parameters but also on their interactions. High nitrogen throughput and low amount of impregnation resulted in detrimental effects on both CO 2 and moisture retention. This was explained in terms of diffusion and mass loss during impregnation through forced convection. An optimum compromise between these factors in correlation with the contribution of moisture content turned out to be an essential requirement for achieving highest CRC levels that express the effective material affinity towards carbon dioxide. These findings provide a useful tool for rigorously optimizing the reversible capture of CO 2 by hydroxylated adsorbents.
      PubDate: Tue, 03 May 2022 11:48:24 +000
       
  • Yasmina Homrani; Mohamed Amin El Amrani et al. - Synthesis and crystal
           structures of palladium complexes based on α-amino-oximes derived from
           (R)-limonene and their application in allylic alkylation of 1,3-dioxo
           compounds

    • Abstract: Les complexes Pd(L1)Cl 2 , Pd(L2)Cl 2 , et Pd(L3)Cl 2 ont été synthétisés à partir des ligands α-amino-oxime L1-L3 issus du (R)-limonene. Ces nouveaux complexes de palladium ont été carractérisés par RMN et diffraction aux rayons X. Les ligands α-amino-oxime associés à des précurseurs de palladium ont été évalués sur des réactions d’alkylation allylique.
      PubDate: Thu, 28 Apr 2022 11:56:56 +000
       
  • Gleb Zilberstein; Svetlana Zilberstein et al. - Jack London and White
           Fang: a lost struggle

    • Abstract: The California State Parks curators granted access to artifacts owned by Jack London that are in storage in their Sonoma Barracks in Sonoma, CA. A medicine case, drug vials, and various paper documents that covered the period of his life from 1906 to 1915 were examined for drug residues left on their surface. All the objects were tested with the non-invasive surface analysis EVA (ethylene-vinyl acetate) technology, which consist of a foil studded with ground mixed-bed cation/anion exchangers as well as with C 8 and C 18 resins. The harvested material collected by the foils was analysed via GC-MS and the following 12 drugs were identified: N-(4-ethoxyphenyl) acetamide, phenyl salicylic acid, morphine, 6-monoacetylmorphine, 3-acetylmorphine, diacetylmorphine, dipenteneglycol, quinine dihydrochloride, quinine base, atropine, scopolamine and hyoscyamine. Despite the claims by his biographers that he used opium, morphine, and heroin on a regular basis this assertion could not be confirmed by the chemical analyses of the objects here tested. Only two opioids were discovered, morphine and diacetylmorphine (heroin) both of which could have been derived from the use of common, legal (over-the-counter) flu and cough medications.
      PubDate: Thu, 28 Apr 2022 11:56:56 +000
       
  • Richard Welter - L’école de cristallographie de Nancy : un
           hommage

    • Abstract: Le décès récent du Professeur Yves Dusausoy, l’un de mes premiers enseignants de cristallographie, m’a donné l’envie de rédiger un article en hommage à l’école de Nancy, où j’ai eu la chance de faire mes études avant d’embrasser ma propre carrière d’enseignant chercheur. C’est en particulier trois «  grands  » professeurs défunts qui ont marqué ma formation et m’ont permis d’être bien formé dans ce vaste domaine de la radiocristallographie.Dans cet article, je veux rendre hommage aux Professeurs Yves Dusausoy, Jean Protas et Niels Hansen et montrer, sur quelques exemples simples, la pertinence de leurs enseignements respectifs.
      PubDate: Thu, 28 Apr 2022 11:56:56 +000
       
  • Majd Ahmed Jumaah; Nadia Salih et al. - D-optimal design optimization of
           unsaturated palm fatty acid distillate and trimethylolpropane
           esterification for biolubricant production

    • Abstract: An edible palm oil processing industries produces an economical by-product or waste of palm fatty acid distillate (PFAD). Many researchers have put an effort to utilize uneconomical PFAD to produce valuable, versatile and high-end products. In this work, polyol ester of green biolubricant base oil was synthesized through the esterification of unsaturated palm fatty acid distillate (USFA PFAD) with polyhydric alcohol, trimethylolpropane (TMP) in the occurrence of sulphuric acid catalyst. The optimization process was conducted by using D-optimal design of the response surface methodology (RSM). The results showed that the highest yield percentage of resultant polyol ester, USFA-TMP ester was obtained at 96.0±0.5% with 99.9±0.9% of tri-ester selectivity. These were obtained at the esterification optimal condition at reaction temperature of 150 °C for 6 h with 5% H 2 SO 4 . The polyol ester chemical structure was characterized by using spectroscopy analysis techniques of infrared (FTIR), proton ( 1 H) and carbon ( 13 C) nuclear magnetic resonance (NMR). The resultant USFA-TMP ester recorded viscosity index of 163, pour points at -45°C, flash points at 298 °C, and thermal oxidative stability temperatures at 215 °C. I was found that the ester product as a Newtonian fluid with viscosity grade lubricant ISO VG 46. In overall, the resultant polyol ester has shown good lubrication properties that make it conceivable to be used for many industrial green biolubricant applications.
      PubDate: Tue, 26 Apr 2022 11:53:22 +000
       
  • Florin Bucatariu; Larisa-Maria Petrila et al. - Versatile nanostructured
           SiO 2 /cross-linked polyelectrolyte composites for emerging pollutants
           removal from aqueous media

    • Abstract: Linear and branched poly(ethyleneimines) and poly(acrylic acid) have been used in the construction of nanostructured thin multilayer organic shell onto silica microparticles. After glutaraldehyde selective crosslinking of part of the amino groups, the polyanionic chains were removed on strong basic media. The core/shell microparticles, with amino groups active sites, could interact with anionic charged species dissolved in aqueous media. Batch/column experiments show that the polyanion extracted composites present the best performance toward gallic acid sorption (∼30 mg/g composite), as compared to the non-extracted samples (∼6 mg/g). The multiple sorption/desorption studies demonstrated the reusability of the composites for water/wastewater treatment applications in at least 10 consecutive cycles without significant loss of sorption capacity.
      PubDate: Mon, 11 Apr 2022 15:36:14 +000
       
  • Bogdan-Constantin Condurache; Corneliu Cojocaru et al. - Innovative
           nanostructured magnetite/wool/polysiloxane composite as magnetic adsorbent
           for oil spill removal

    • Abstract: We report herein the synthesis and characterization of a new nanostructured composite (Wool-Fe 3 O 4 -Polysiloxane) aimed to be applied as a magnetic adsorbent for oil spill cleanup. The synthesized composite was characterized by the physical–chemical instrumental techniques (XRD, FTIR, SEM-EDX, and VSM). The hysteresis loops from the VSM measurement disclosed a magnetic saturation value of M S =5.47 emu/g that was sufficient to induce magnetic properties to the composite material. The produced magnetic adsorbent showing hydrophobic properties was successfully tested for the sorption of petroleum products. Kinetic data of oily liquids retention and dripping were modeled by using the exponential and hyperbolic regression equations with three parameters. The hyperbolic kinetic model suggested higher maximal sorption capacity at time zero (t=0), that is, 14.486, 12.896, and 3.501 g/g, for motor oils 15W, 5W, and n-dodecane, respectively. The advanced recovery (80–92%) of retained oils from the spent sorbent was done by centrifugation.
      PubDate: Mon, 11 Apr 2022 15:36:14 +000
       
  • Dominique Bazin; Jelle Vekeman et al. - Nanostructured materials and
           heterogeneous catalysis: a succinct review regarding DeNox catalysis

    • Abstract: Les oxydes d’azote NOx issus des gaz d’échappement des moteurs Diesel participent à la détérioration de l’environnement, la moitié des émissions de NO leur étant imputable. Le monoxyde d’azote provient essentiellement des réactions chimiques entre l’azote de l’air et l’oxygène qui s’établissent à très haute température. Le défi consiste à réduire cette émission qui doit être sélective en azote (éviter la formation de N 2 O ou de NO 2 ). En ce qui concerne les catalyseurs mis en œuvre, on en distingue trois groupes : les oxydes de métaux, les métaux nobles et les zéolites. A partir de données expérimentales obtenues sur l’adsorption du NO sur des agrégats monométalliques, une relation entre les modes d’adsorption de cette molécule (adsorption moléculaire/chimisorption) et la réponse de l’agrégat métallique face à cette adsorption (croissance/dissociation) a été proposée. Les études théoriques basées sur la théorie de la fonctionnelle de la densité confortent cette relation. Cette contribution présente l’ensemble de ces résultats expérimentaux et théoriques et tache de montrer l’aspect prédictif d’une telle relation.
      PubDate: Mon, 11 Apr 2022 15:36:14 +000
       
  • Elvira Mahu; Petrisor Samoila et al. - Influence of fuel nature on
           sol–gel microwave-ignited combustion synthesis of nanosized cobalt and
           nickel spinel ferrites

    • Abstract: CoFe 2 O 4 et NiFe 2 O 4 ont été obtenues par voie sol–gel combustion assistée par micro-ondes en utilisant trois agents de chélation/combustion : l’acide maléique, l’acide citrique et l’urée. Les nanomatériaux produits ont été caractérisés en suivant leur structure, morphologie, texture et propriétés magnétique. Les ferrites spinelles produites ont été utilisées comme adsorbants pour Orange-II des eaux usées synthétiques. L’échantillon de ferrite de nickel préparé en utilisant de l’urée comme combustible présentait des propriétés distinctives telles que la plus petite taille de cristallite et la plus grande surface spécifique. De plus, ce matériau était le plus efficace pour l’adsorption du polluant organique (50.32 mg/g).
      PubDate: Mon, 11 Apr 2022 15:36:14 +000
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 3.230.142.168
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-