Pedosphere 10(1): 11--20, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Characteristics of lead sorption on clay minerals in relation to metal oxides |
| ZHUANG Jie1, YU Gui-Rui2 and LIU Xiao-Yi3 |
1 Laboratory of Environmental Science of Plants, Faculty of Horticulture, Chiba University, Matsudo 648, Matsudo-city, Chiba 271-8510 (Japan);
2 The Synthesis Research Centre of Chinese Ecosystem Research Network, the Chinese Academy of Sciences, 3 Datun Road,
Chaoyang District, P. O. Box 9717, Beijing 100101 (China);
3 Faculty of Land and Environmental Science, Shenyang
Agricultural University, 120 Dongling Road, Shenyang 110161 (China) |
| ABSTRACT |
| Difference of montmorillonite (Mt), illite (It) and kaolinite (Kt) in lead sorption characteristics and the effects of amorphous Fe and Al oxide coatings on the characteristics were experimentally studied with a logistic model. The sorption curves had a sigmoid pattern due to the use of acetate-type buffer solution. With the model the sorption process could be divided into four stages and the sorption characteristics at these stages are discussed. The results showed that, after Mt, It and Kt were coated by amorphous Fe oxide, their maximum sorption capacity (MSC) and percentage of high-SSC concentration scope (HCS) of Pb2+ increased markedly, but the specific sorption capacity (SSC) decreased. With regard to effects of amorphous Al oxide coating, except for It + Al, the SSC of other samples showed a downtrend, despite that their MSC remained unchanged. Eventually, the grey correlation degrees to Pb2+ sorption for different physicochemical characteristics of the clay minerals were higher for hydronium, zero point of surface charge and hydroxy, but lower for specific surface area, density of surface charge and amount of surface charges. |
| Key Words: clay mineral, lead sorption, logistic model, metal oxide |
| Citation: Zhuang, J., Yu, G. R. and Liu, X. Y. 2000. Characteristics of lead sorption on clay minerals in relation to metal oxides. Pedosphere. 10(1): 11-20. |
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