A study on the adsorption of chromium on laterite from Guizhou Province, China

The adsorption behaviors of Cr(VI) on laterite from Guizhou Province were studied in this paper, and the adsorption mechanism was discussed as well. Results showed that different mineral compositions in the laterite would cause differences in the capacity of laterite to absorb Cr(VI). Gibbsite, iron oxide minerals and non-crystalloids are the main contributors to enhancing the capacity of laterite to absorb Cr(VI). The pH of the solution is an important factor affecting the adsorption of Cr(VI) on laterite. Acidic environment (pH=2-5) is favorable to the adsorption of Cr(VI). The amount of adsorbed Cr(VI) decreases with increasing pH of the solution. With increasing initial concentrations of Cr(VI), the amount of adsorbed Cr(VI) increases first, and then decreases. The optimal adsorption concentration of Cr(VI) on laterite is 250 μg/mL. The adsorption of Cr(VI) on laterite is a rapid process, about 80% Cr(VI) will be adsorbed within 2 hours. And the adsorption of Cr(VI) on kaolinite is a slow process.

作 者： YU Xiaohong ZHU Lijun GUO Baiwei HE Shouyang   作者單位： YU Xiaohong(The Institute of Geo-Environmental Monitoring of Guizhou Province, Guiyang 550004, China)

ZHU Lijun(Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education Guizhou University,Guiyang 550003, China)

GUO Baiwei(The School of Civil Engineering & Architecture of Guizhou University, Guiyang 550003, China)

HE Shouyang(The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;Graduate University of the Chinese Academy of Sciences, Beijing 100039, China) 

刊 名： 中國地球化學學報（英文版）  英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY  年，卷(期)： 2009 28(2)  分類號： P59  關鍵詞： adsorption   laterite   chromium (VI)   pH value   isotherm   kinetics  

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