Sorption of Se(IV) on Fe- and Al-modified bentonite
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The sorption behavior of Se(IV) on Fe- and Al-modified bentonite is studied through batch experiments. In order to introduce active centers for Se(IV) sorption, bentonite was modified with iron, iron oxocations and aluminum oxocations at 400, 600 and 800 °C. It was found that calcined temperature had great effect on the sorption with above 80 % sorption at 400 °C, whereas with only 5 % sorption at 800 °C. The sorption capacities for Se(IV) were 112.5 mg/g by FeOH-B, 60.1 mg/g by AlOH-B and 71.9 mg/g by Fe-B, respectively. The pH-dependent and ionic strength-independent Se(IV) sorption on these modified bentonites demonstrated that the sorption mechanism of Se(IV) was inner-sphere surface complexation at low pH values.
KeywordsModified bentonite Se(IV) Thermal treatment Sorption mechanism
The authors gratefully acknowledge the financially supported by National Natural Science Foundation of China (Grant No. 11275147 and Grant No. 21207035) and Project supported by the Scientific Research Starting Foundation for Returned Overseas Chinese Scholars, Ministry of Education, China.
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