Abstract
Abstract We investigated local structures around cadmium (Cd) sorbed on montmorillonite at various pH values by EXAFS (extend X-ray absorption fine structure). We found two sorption types, an outer-sphere complex and a surface precipitate. The outer-sphere complex was mainly formed at a lower pH which had an identical structure to aqueous Cd2+, while the surface precipitate was found at high pH which had a one-layer Cd5(OH)8(NO3)2(H2O)2-like structure.
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