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Fixed-Bed Column Adsorption Modeling of MnO₄- Ions from Acidic Aqueous Solutions on Activated Carbons Prepared with the Biomass

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Open Journal of Inorganic Chemistry 2023年第2期13卷 25-42页

作者： Charly Mve Mfoumou francis ngoye Pradel Tonda-Mikiela Mbouiti Lionel Berthy Bouassa Mougnala Spenseur Guy Raymond Feuya Tchouya Laboratoire de Chimie des Milieux et des Matériaux Inorganiques (LC2MI) URCHI Université des Sciences et Techniques de Masuku (USTM) Franceville Gabon Département de Chimie Faculté des Sciences Université des Sciences et Techniques de Masuku (USTM) Franceville Gabon

Activated carbons calcined at 400˚C and 600˚C (AC-400 and AC-600), prepared using palm nuts, collected in the town of Franceville in Gabon, were used to study the dynamic adsorption of MnO4- ions in acidic media on fixed bed column and on the kinetic modeling of experimental data of breakthrough curves of MnO4- ions obtained. Results on the adsorption of MnO4- ions in fixed-bed dynamics obtained on AC-400 and AC-600 adsorbents beds indicated that the AC-400 bed appears to be the most efficient in removing MnO4- ions in acidic media. Indeed, the adsorbed amounts, the adsorbed capacities at saturation and the elimination percentage of MnO4- ions obtained with AC-400 (31.24 mg;52.06 mg·g-1 and 41.65% respectively) were higher compared to those obtained with AC-600 (9.87 mg;16.45 mg·g-1 and 17.79% respectively). The breakthrough curves kinetic modeling revealed that the Thomas model and the pseudo-first-order kinetic model were the most suitable models to describe the adsorption of MnO4- ions on adsorbents studied in our experimental conditions. The results of the intraparticle diffusion model showed that intraparticle diffusion was involved in the adsorption mechanism of MnO4- ions on investigated adsorbents and was not the limiting step and the only process controlling MnO4- ions adsorption. In contrast to AC-400, the intraparticle diffusion on AC-600 bed plays an important role in the adsorption mechanism of MnO4- ions.

关键词： Acidic Media MnO4- Biomass Activated Carbon Dynamic Adsorption Kinetics Models

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Study of the Temperature-Programmed Desorption of Carbon Dioxide (CO₂) on Zeolites X Modified with Bivalent Cations

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Journal of Environmental Protection 2023年第1期14卷 66-82页

作者： Charly Mve Mfoumou francis ngoye Pradel Tonda-Mikiela Ferdinand Evoung Evoung Landry Biyoghe Bi-Ndong Thomas Belin Samuel Mignard Laboratoire de Chimie des Milieux et des Maté riaux Inorganiques (LC2MI) URCHI/Universit&eacute des Sciences et Techniques de Masuku (USTM) Franceville Gabon Dé partement de Chimie Facult&eacute des Sciences Universit&eacute des Sciences et Techniques de Masuku (USTM) Franceville Gabon Institut de Chimie des Milieux et Maté riaux de Poitiers (IC2MP) UMR 7285 CNRS/Universit&eacute de Poitiers 4 Rue Michel Brunet Poitiers Cedex France

Study of physisorbed and chemisorbed carbon dioxide (CO2) species was carried out on the NaX zeolite modified by cationic exchanges with bivalent cations (Ca2+ and Ba2+) by temperature-programmed desorption of CO2 (CO2-TPD). Others results were obtained by infrared to complete the study. The results of this research showed, in the physisorption region (213 - 473 K), that the cationic exchanges on NaX zeolite with bivalent cations increase slightly the interactions of CO2 molecule with adsorbents and/or cationic site. Indeed, the desorption energies of physisorbed CO2 obtained on the reference zeolite NaX (13.5 kJ·mol-1) are lower than that of exchanged zeolites E-CaX and E-BaX (15.77 and 15.17 kJ·mol-1 respectively). In the chemisorbed CO2 region (573 - 873 K), the desorption energies related to desorbed species (bidentate carbonates: CO32-) on the exchanged zeolites E-CaX and E-BaX are about 81 kJ·mol-1, higher than the desorbed species (bicarbonates: HCO32-) on the reference R-NaX (62 kJ·mol-1). In addition, the exchanged E-BaX zeolite develops the secondary adsorption sites corresponding to bicarbonates species with desorption energies of 35 kJ·mol-1 lower to desorption energies of bicarbonates noted on the reference zeolite NaX.

关键词： Adsorption Faujasite X Chemisorbed and Physisorbed CO2 Exchanged Zeolites Bivalent Cations Temperature-Programmed Desorption (TPD) Infrared

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Study of the Temperature-Programmed Desorption of Carbon Dioxide (CO2) on Zeolites X Modified with Bivalent Cations

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Journal of Environmental Protection（环境保护） 2023年第1期

作者： Charly Mve Mfoumou francis ngoye Pradel Tonda-Mikiela Ferdinand Evoung Evoung Landry Biyoghe Bi-Ndong Thomas Belin Samuel Mignard

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