Effects of Chelating Agents on Zeta Potential of Cadmium-Contaminated Natural Clay

被引：21

作者：

Gu, Ying-Ying ^{[1
]}

Yeung, Albert T. ^{[1
]}

Koenig, Albert ^{[1
]}

Li, Hong-Jiang ^{[2
]}

机构：

[1] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China

[2] Tongji Univ, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

来源：

SEPARATION SCIENCE AND TECHNOLOGY | 2009年 / 44卷 / 10期

关键词：

Acid; base buffer capacity; cadmium; citric acid industrial wastewater; EDTA; electrokinetic remediation; natural clay; phosphonates; zeta potential; ELECTROKINETIC REMEDIATION; ENHANCEMENT; BENTONITE; SORPTION;

D O I：

10.1080/01496390902976731

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2203 / 2222

页数：20

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