Effects of chelating agents on zeta potential of cadmium-contaminated natural clay

Ying Ying Gu, Albert T. Yeung, Albert Koenig, Hong Jiang Li

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2203-2222
Number of pages20
JournalSeparation Science and Technology
Volume44
Issue number10
DOIs
StatePublished - Jan 2009

Keywords

  • Acid/base buffer capacity
  • Cadmium
  • Citric acid industrial wastewater
  • EDTA
  • Electrokinetic remediation
  • Natural clay
  • Phosphonates
  • Zeta potential

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