Pedosphere 16(2): 185--191, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of organic acids on adsorption of Cadmium onto kaolinite, goethite, and bayerite |
LIAO Min |
| College of Environmental and Resource Sciences, Department of Resources Science, Zhejiang University, Hangzhou 310029 (China). E-mail: liaomin@zju.edu.cn |
| ABSTRACT |
| Effects of organic acids (oxalic, acetic, and citric) on adsorption characteristics of Cadmium (Cd) on soil clay minerals (kaolinite, goethite, and bayerite) were studied under different concentrations and different pH values. Although the types of organic acids and minerals were different, the effects of the organic acids on the adsorption of Cd on the minerals were similar, i.e., the amount of adsorbed Cd with an initial solution pH of 5.0 and initial Cd concentration of 35 mg L-1 increased with increasing concentration of the organic acid in solution at lower concentrations, and decreased at higher concentrations. The percentage of Cd adsorbed on the minerals in the presence of the organic acids increased considerably with increasing pH of the solution. Meanwhile, different Cd adsorption in the presence of the organic acids, due to different properties on both organic acids and clay minerals, on kaolinite, goethite, or bayerite for different pHs or organic acid concentrations was found. |
| Key Words: adsorption, cadmium, clay minerals, organic acids |
| Citation: Liao, M. 2006. Effects of organic acids on adsorption of Cadmium onto kaolinite, goethite, and bayerite. Pedosphere. 16(2): 185-191. |
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