Metal ions adsorption affinity of clayey materials from the North West Province of South Africa

Abstract

Local clays that are abundant in the periphery of Potchefstroom in South Africa were characterized and investigated as potential sorbents for the removal of metal ions from effluents. The clay samples mostly contained illite-montmorillonite and had a buffering capacity suitable for increased interaction with metal ions in solution. The use of these clays showed adsorption capacities above 35 mg/g for Pb2+, Cu2+ and Zn2+. Prediction of their adsorption behaviour with the Langmuir model revealed a higher binding affinity for Pb2+. These clays are potential sorbents that will be further investigated to design and construct a treatment plant for mine effluents in the area