Optimization of Methylene Blue Dye Removal Adsorbed on Olive Pomace Derived Activated Charcoal: Isotherm, Kinetic and Thermodynamic Studies

Résumé

Abstract Methylene blue (MB) is one of dyes used in the industry. However, these dyes contribute generally to water pollution. The continued accumulation of these organic compounds has had a significant and negative harmful on the environment and human health. Therefore, many biological, physical and chemical processes have been developed aiming to eliminate these compounds from the environment. Of these processes, adsorption is the most well-known one. In this context, this study aims to assess the absorbent properties of an olive pomace derived activated charcoal (ACp) against the methylene blue dye. For this purpose, to confirm MB adsorption on ACp structures, SEM, EDX and FTIR analysis were performed. The influence of dye concentration, contact time, pH, adsorbent dose and temperature were studied to evaluate the removal efficiency of MB by adsorption. In which, kinetic and isothermal models were used to better understand the adsorption mechanism. A good correlation has been indicated with the pseudo-second-order kinetic model and Langmuir isotherm. Also, thermodynamic result related to the adsorption process indicating physisorption, endothermic, spontaneous, and favorable.

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