Adsorption of acetic acid from aqueous solutions by using tea waste as low-cost biosorbent: Equilibrium, kinetic and thermodynamic studies

O. Khelifi, A. Djadallah, Kh. Khalili, F. Khanfoussi, H. Laksaci, M. Nacef, M.L. Chelaghmia, A.M. Affoune


This study aims to evaluate the preparation of a low-cost biosorbent from tea wastes were for use as a natural carrier for the removal of acetic acid from aqueous solutions. In order to clarify the adsorption process, batch experiments were carried out to study operating parameters effect on the adsorption process such as: contact time (5-60 min); initial concentration of acetic acid (0.01-0.1 mol L-1) and temperature (15-35 °C). The experimental data were analyzed by Langmuir and Freundlich isotherm. The equilibrium is perfectly described by the Langmuir model (R2>0.99) with a maximum monolayer adsorption capacity of 20.16 mg g-1 and the calculated specific surface area is equal to 42.489 m2 g-1. Kinetic study shows that the pseudo-second order well fitted the kinetic data. Thermodynamic parameters indicate that the adsorption process is feasible, spontaneous and exothermic. The results of the present study show that tea waste can be advantageously used as a low cost biosorbent for the removal of an acid from aqueous solutions.

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