Abstract

This study presents kinetic and thermodynamic studies on the adsorption of Zn2+ onto chitosan-aluminium oxide
composite material. The adsorption of Zn2+ onto chitosan-aluminium oxide composite material was found to follow
pseudo-second-order kinetic model and the apparent adsorption activation energy (Ea) was measured to be
37.20kJ/mol. Adsorption was mainly chemical adsorption. Thermodynamic data supported Langmuir adsorption
model and the enthalpy of adsorption (ΔHθ) and the entropy of adsorption (ΔSθ) were found to be 17.81kJ/mol and
109.77J/(mol?K), respectively. The adsorption Gibbs free energy (ΔGθ) decreased with the increase of temperature.

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