Abstract
Raw montmorillonite (Mt) was cation-exchanged with Ca2+, Mg2+, and Fe3+, and Pb2+ was tested for its adsorption on the exchanged Mt. The d-value and the cation exchange capacity (CEC) of Ca-exchanged montmorillonite (Ca2++Mt) were larger than those of Mg-exchanged montmorillonite (Mg2++Mt) and Fe-exchanged montmorillonite (Fe3++Mt). The Pb2+ adsorption on the homoionic Mt was fast and the amount of Pb2+ adsorption followed the order of Ca2++Mt>Mg2++Mt>Fe3++Mt. Simulation of Pb2+ adsorption on the Mt revealed a much larger energy drop when Pb2+ is substituting for Ca2+ in comparison to Pb2+ exchanging for Fe3+.
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