MULTI-COMPONENT OF HEAVY METAL CONTAMINANTS ADSORPTIVITY AND COMPATIBILITY ONTO VARIABLE CHARGE CLAY MINERAL

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This work examines the adsorptivity of different combinations of lead, copper and cadmium ions onto the clay mineral kaolinite covering a wide range of concentrations of single, binary and ternary solutions. Batch adsorption equilibrium tests were used. The results of single Pb²⁺, Cu²⁺ and Cd²⁺ solutions were compared with those of binary Pb²⁺Cu^2+, Pb²⁺Cd²⁺, Cu²⁺Cd²⁺ and ternary Pb²⁺Cu²⁺Cd²⁺ solutions. Results indicate that the adsorptivity of heavy metal ions is slightly lower in binary and ternary solutions than for single ion species in the solution. Lead shows a higher selectivity on kaolinite of the three heavy metal ions, while Cu²⁺ and Cd²⁺ give very similar s