Department of Chemical Technology, University of Johannesburg, PO Box 17011, Doornfontein 2028, South Africa; Minerals Processing and Technology Research Group, Department of Extraction Metallurgy, University of Johannesburg, PO Box 526, Wits 2050, South Africa
Mamba, B.B., Department of Chemical Technology, University of Johannesburg, PO Box 17011, Doornfontein 2028, South Africa; Nyembe, D.W., Department of Chemical Technology, University of Johannesburg, PO Box 17011, Doornfontein 2028, South Africa; Mulaba-Bafubiandi, A.F., Minerals Processing and Technology Research Group, Department of Extraction Metallurgy, University of Johannesburg, PO Box 526, Wits 2050, South Africa
Southern African clinoptilolites capability as an ion-exchanger with respect to Cu2+and Co2+was investigated in order to consider its viability in the removal of metal cations from aqueous solutions. The effect of chemical conditioning was investigated using sodium chloride (NaCl), hydrochloric acid (HCl) and potassium chloride (KCl). The most efficient activating or conditioning reagent was found to be HCl at 0.02 M concentration, followed by KCl at 0.04 M and then NaCl at 0.04 M. The worst performing clinoptilolite was the original form under the conditions described in this study and it thus served as a control. The HCl-conditioned clinoptilolite was the most efficient in metal removal (79% Co2+and 73% Cu2+) followed by the NaCl-conditioned form (69% Co2+ and 54% Cu2+), while the KCl-conditioned form adsorbed 54% and 73% of Co2+and Cu2+, respectively. The column method was used for the cation-exchange processes with synthetic solutions of 0.0020 M, 0.0698 M and 0.2000 M of Co2+and Cu2+ concentrations which were measured using atomic absorption spectroscopy (AAS).
[Co/Cu]; Aqueous solutions; Atomic absorption spectroscopy; Cation exchanges; Chemical conditioning; Clinoptilolite; Clinoptilolites; Column methods; Effect of chemicals; Metal cation; Metal removal; Potassium chloride; Removal efficiencies; Synthetic solutions; Absorption spectroscopy; Adsorption; Atomic spectroscopy; Cobalt; Hydrochloric acid; Ion exchange; Ion exchangers; Positive ions; Sodium chloride; Solutions; Zeolites; Chemicals removal (water treatment); aqueous solution; atomic absorption spectroscopy; cobalt; copper; hydrochloric acid; ion exchange; potassium chloride; sodium chloride; zeolite