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Adsorption of a cationic dye (Yellow Basic 28) ontothe calcined mussel shells: Kinetics, Isotherm and Thermodynamic Parameters

Imane EL Ouahabi, Rachid Slimani, Imane Hachoumi, Fatna Anouar, Nawal Taoufik, Abdellah Elmchaouri, Said Lazar

Abstract


The aim of this study is to valorise the mussel shells and evaluate the adsorption capacity of calcined mussel shells for the cationic dyes.  The adsorbent was characterized by DRX, FTIR, BET and SEM, respectively. The adsorption of Yellow Basic28 on calcined mussel shells was investigated using the parameters such as concentrations (10-50mg/L), pH (3-10), ionic strength (0-2 mol / L) and temperature (288 - 318 °C).  The adsorption rate data were analysed according to the first and second-order kinetic models.  The adsorption kinetics was found to be best represented by the pseudo-second-order kinetic model.  The experimental isotherm data were analyzed using Langmuir, Freundlich, Temkin, Elovich and Dubinin–Radushkevich isotherm equations on the dye-adsorbent system. The experimental data yielded excellent fits with Freundlich isotherm equation (R² = 0.966). It was indicative of the heterogeneity of the adsorption sites on the CMS particles.  Various thermodynamic parameters such as enthalpy of adsorption ΔH°, free energy change ΔG°and entropy ΔS° were estimated.  The positive value of ΔH°(30.321 kJ/mol) and negative values of ΔG° (from -5.392 to -2.873 kJ/mol) show the process is endothermic and spontaneous.  The negative value of entropy ΔS° (-87.172 J/mol K) suggest the decreased randomness at the solid-liquid interface during the adsorption of dyes onto calcined mussel shells.


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