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Optimized Adsorption of Small and Medium Molecules by a Biosorbent Based on Hevea Hulls

Journal of Materials Science and Chemical Engineering 2024年第9期12卷 69-83页

作者： Djedjess Essoh Jules César Meledje Yapo Hermann Aristide Yapi David Léonce Kouadio djamatchè paul valéry akesse Kolo Yeo Laboratoire des Sciences Physiques Fondamentales et appliques Ecole Normale Suprieure dAbidjan Abidjan Cte dIvoire Mathmatiques physiques Chimie Physique UFR Environnement Universit Jean Lorougnon Gud Daloa Cte dIvoire

In the context of the recovery of agricultural waste, many researches have focused on the preparation of adsorbents from natural waste from fruit trees, egg shells, palm waste or sawdust. This work aims to optimize the preparation of a biosorbent from rubber hulls by studying its ability to adsorb small and medium molecules. The influence of parameters such as drying temperature (X1), particle size (X2), stirring time (X3) and sodium hypochloride mass (X4) was studied. The results indicate that the model used for biosorbent optimization on methylene blue and iodine index is significant. In addition, this model has greater adsorption capabilities on small molecules than with large molecules. Statistical analysis of the data shows that temperature is the most influential factor in the adsorption of small molecules. On the other hand, particle size has a significant influence on the adsorption of large molecules. The optimum biosorbent preparation values are 1.0 for drying temperature (X1), −1.0 for biosorbent grain size (X2), 1.0 for stirring time (X3) and 1.0 for sodium hypochloride mass (X4).

关键词： Optimization Biosorbent Methylene Blue Index Iodine Index Rubber Hulls

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Desorption of Methylene Blue Adsorbed on Activated Carbon from Cocoa Pod Shell

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Open Journal of Applied Sciences 2023年第5期13卷 605-617页

作者： David Léonce Kouadio Yapo Aristide Hermann Yapi Djedjess Essoh Jules César Meledje Kacou Alain Paterne Dalogo djamatché paul valery akesse Brou Dibi Karim Sory Traore Laboratoire des Sciences et Technologie de l’Environnementale Université Jean Lorougnon Guede C&#244te d’Ivoire Laboratoire des Sciences Physiques Fondamentales et appliquées école Normale Supérieure (Abidjan) Abidjan C&#244te d’Ivoire Laboratoire des Sciences de l’Environnement Université Nangui Abrogoua C&#244te d’Ivoire

Environmental protection has become a concern for the world. For this reason, the objective of this work is to remove methylene blue adsorbed on activated carbon. The coal used comes from cocoa pod shells. Before pyrolysis, the shells were ground, sieved and impregnated with orthophosphoric acid. Before desorption, the activated carbons were initially saturated with MB. These saturated coals were brought into contact with a sodium chloride (NaCl) solution and then stirred. The evolution of the resorbed MB concentration was monitored by spectrophotometry. The desorption tests showed a remarkable elimination from the first 10 minutes. The desorption kinetics comprises two phases: a rapid kinetics between 0 and 30 minutes and a slow kinetics between 30 and 60 minutes. The desorption of the dye reaches a concentration aqual to 0.84 mg/l at pH = 4 at temperature = 80°C. For modeling, the coefficient of the Langmuir II model is greater than or equal to O.9893. The model of Langmuir III is less than or equal to 0.9373. The Freundlich model coefficient is 0.9842 or less. The desorption is thefore carried out on energy-homogeneous adsorption sites and without any interaction between the adsorbed cations of the dye. Experimental parameters such as pH, temperature and concentration of sodium chloride (NaCl) solution influence the desorption of MB. And the model of Langmuir II describes well the process of desorption of the MB.

关键词： Desorption Activated Carbon Methylene Blue Isotherm Sodium Chloride

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