Effects of Chelating Agents on Zeta Potential of Cadmium-Contaminated Natural Clay
The effects of pH, ionic strength, cadmium concentration, and chelating agents on the zeta potential of a natural clay of high acid/base buffer capacity from Shanghai, China were investigated in this study, with a view to enhancing the efficiency of electrokinetic remediation of the cadmium-contaminated clay. An increase in the ionic strength of the background solution or cadmium concentration increases the zeta potential on soil particle surfaces, i.e., less negative. CAIW increases the zeta potential slightly but the effects are not pronounced. EDTA and phosphonates decrease the zeta potentials of soil particle surfaces, thus enhancing forward electroosmotic flow.
Keywords: Acid/base buffer capacity; EDTA; cadmium; citric acid industrial wastewater; electrokinetic remediation; natural clay; phosphonates; zeta potential
Document Type: Research Article
Affiliations: 1: Department of Civil Engineering, University of Hong Kong, Pokfulam Road, Hong Kong 2: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China
Publication date: 01 January 2009
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