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Adsorption of heavy metal Cu~(2+),Zn~(2+) and Cd~(2+) in Na-bentonite

Yingchun Zhang

Abstract

The adsorption of Cu2+,Zn2+ and Cd2+ in Na-bentonite was studied by isothermal adsorption test.The test results show that Na-bentonite has good affinity for Cu2+,Zn2+ and Cd2+,and the isothermal adsorption curve is good accord with Langmuir equation.The adsorption capacities of the Na-bentonite increases with increasing concentration of metals ions.The adsorption capacities of the Na-bentonite are found to have selectivity,and ordered in Cu2+Zn2+Cd2+.The research results indicate that Na-bentonite is a good kind of amendments with no second pollution for contaminated soil by heavy metals,and can decrease the efficiency of heavy metal in soil.

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Key concepts: Bentonite, Adsorption, Isothermal process, Metal, Chemistry, Metal ions in aqueous solution, Heavy metals, Langmuir adsorption model