Toxic Dyes Removal by Mchounche Clay: Equilibrium, Kinetic and Thermodynamic Studies
Creators: name: Rania, Remmani
name: Makhloufi Rachid
name: Bouzidi Narimane
name: Malek, Miladi
name: Messai Bahia
Publisher: name: Zenodo
Year: 2021
Subjects: adsorption, dye, clay, kinetic, isotherm

description: The aim of this article is the study of the efficiency of toxic dyes removal (methylene blue MB, methyl red MR, methyl orange MO, methyl green MG, phenolphthalein QQ and gentian violet GV) from aqueous solution onto Mchounche clay. The adsorption phenomenon in batch manner was used as water treating method, this treatment was tested by UV-vis analysis to study the kinetics of adsorption; These results show that the uptake of the dyes onto clay surface is a speed phenomenon in the first minutes and after that it becomes slow. Furthermore, the kinetic parameters for the adsorption of the dyes using the PSO model are more suitable due to the highest R², lowest RMSE and the close between Qe exp and Qe cal values. The thermodynamic curves of the removal of the dye show that all the adsorption is an exothermic phenomenon as a physical type of adsorption depends on VDW interactions between adsorbent and adsorbate. The results of initial pH influence indicate that the removal of QQ increases on both acid and basic mediums, the removal of GV and MO increase in acid medium and a decrease in the basic medium. Oppositely, the removal of all rest dyes decreases in both acid and basic mediums. The Modeling of adsorption isotherm of toxic dyes presented that Freundlich fit is the best one due to the R² high values and RMSE low values. Finally, It can be concluded that Mchounche clay has removed the highest removal quantity of BM, MO, and MG with the adsorbed quantities at equilibrium Qe exp values 19.99, 19.74 and 19.24 respectively.
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