COPPER REMOVAL: KINETIC AND THERMODYNAMIC STUDY

The capacity of one material synthesized from ash to remove Cu2+ from aqueous solutions was evaluated. Adsorption kinetics measurements were performed at 298, 308 and 323 K and thermodynamic parameter was calculated. The adsorption process was found to be feasible and spontaneous due to negative value of Gibbs free energy (í6.91 kJ mol- 1 at 25 °C). Kinetic studies have been carried out to evaluate Cu2+ adsorption using a number of three parametric equations: the pseudo first order, pseudo second order and intra-particle diffusion model equations. Results obtained showed that for all the studied temperatures the adsorption process follows a pseudo second order kinetic model, which demonstrates that the chemical adsorption process is predominantly.