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《Journal of Safety and Environment》 2007-02
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Study on the adsorption of CrO_4~(2-) on Fe/Al modified bentonites

WU Jian-jun1, 2, XU Ren-kou1, XIAO Shuang-cheng1(1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 2 College of Resources and Environment, Nanjing Agricultural University, Nanjing 210095, China)  
Clay fraction less than 2μm in diameter was separated from a bentonite collected from Nanjing suburb by decantation and then Fe/Al modified bentonites were prepared from bentonite colloid after it was saturated with Na+ in this study. Adsorption of CrO42-by Fe/Al modified bentonites was investigated with a batch method. The results of our study have shown that a noticeable increase in CrO42-adsorption by Fe modified bentonite than the one modified by Al. When the equilibrium adsorption concentration was 0.5 mmol·L-1, the amount of CrO42-adsorbed by Mt-1(Fe), Mt-2(Fe) and Mt-3(Al) was 271.0 mmol·kg-1, 114.0 mmol·kg-1 and 16.1 mmol·kg-1, respectively. Since the amount of CrO42-adsorbed by Fe/Al modified bentonites increases with the increase in the ion strength and decreases with the increase of pH, the adsorption of CrO42-may involve specific and electrostatic interaction of CrO42-with the modified bentonites. The specific adsorption can be thought of as the main mechanism for CrO42-under the experimental conditions in this study. The contribution of electrostatic adsorption proves less than 30% of the total adsorption of CrO_4~(2-). Thus, the results obtained are expected to provide a useful reference to developing new doses for waste water treatment.
【Fund】: 国家自然科学基金资助项目(20577054)
【CateGory Index】: X132
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