Adsorption study of Cu2+ ions from aqueous solution using kaolinite and metakaolinite

The adsorption potential of two samples of clays namely Kaolinite (KAO) and Metakaolinite (MKB) for the adsorption of Cu2+ ions from aqueous solution was investigated. The effects of pH, contact time, adsorbent dosage and initial concentration of Cu2+ ions solution were studied on the adsorption feasibility onto KAO and MKB. The maximum adsorption capacities of Cu2+ ions onto KAO and MKB were found to be 14.3 and 21.3 mg.g−1 respectively .The Dubinin-Kaganer-Radushkevich model's revealed that, the Cu2+ ions adsorption onto KAO and MKB was governed by physical adsorption and the equilibrium study obeyed the Freundlich isotherm model. The kinetic investigation of Cu2+ ions adsorption onto KAO and MKB fitted well the pseudo-first-order kinetic model.