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

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 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

作者机构：Laboratoire des Sciences et Technologie de l’Environnementale Université Jean Lorougnon Guede Côte d’Ivoire Laboratoire des Sciences Physiques Fondamentales et appliquées école Normale Supérieure (Abidjan) Abidjan Côte d’Ivoire Laboratoire des Sciences de l’Environnement Université Nangui Abrogoua Côte d’Ivoire 

出 版 物：《Open Journal of Applied Sciences》 (应用科学（英文）)

年 卷 期：2023年第13卷第5期

页      面：605-617页

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

主　　题：Desorption Activated Carbon Methylene Blue Isotherm Sodium Chloride 

摘      要：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.