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[2P0115-20-02] Removal of Cd and Pb ions from sulfate and chloride solutions by cementation using aluminum and activated carbon

○Sanghyeon Choi¹, Sanghee Jeon¹, Ilhwan Park¹, Mayumi Ito¹, Naoki Hiroyoshi¹ (1. Hokkaido University)

Keywords:Cementation, Aluminum, Activated carbon, Lead, Cadmium

Removal of toxic cadmium (Cd) and lead (Pb) ions from chloride solutions and Cd from sulfate solutions by cementation using aluminium (Al) and effects of activated carbon (AC) addition on the removal efficiency were investigated at different pH. In chloride solutions, cementation efficiencies of Cd and Pb were over 99% even without AC at pH 1 - 5. In sulfate solutions, efficiency of Cd cementation with Al was over 99% at final pH below 4.5; however, there was no cementation at final pH over 4.5. When AC was added together with Al, Cd cementation efficiency at final pH above 4.5 was enhanced from 0% to around 60%. SEM-EDX analysis results showed that Cd was detected on activated carbon particles attached on Al surface.