Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. III
Written by Gabriela BUEMA, Sorin Mihai CIMPEANU, Daniel Mircea SUTIMAN, Razvan TEODORESCU, Daniela BURGHILA, Ramona Carla CIOCINTA, Daniel BUCUR, Maria HARJA

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 (-6.91 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.

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SPUPOPUPNO1

adsorption

copper ions

kinetic

low cost adsorbent

thermodynamic