Abstract
Se(IV) sorption on purified Na-kaolinite was investigated under ambient temperature as functions of contact time, pH, ionic strength and Se(IV) concentration using batch techniques. The rate of sorption is relatively rapid and sorption kinetics of Se(IV) can be successfully described by the pseudo-second-order model. The amount of Se(IV) sorbed was moderately dependent on the solution pH but insensitive to ionic strengths. The sorption/desorption isotherms of Se(IV) show that the sorption process is reversible. A double layer model was set up and used to quantitatively interpret the experimental data. Three surface complexes (≡Al)2SeO3, ≡ AlSeO3 − and ≡AlOHSeO3 2− were proposed which satisfactorily fit our data.
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Acknowledgments
The financial support from National Natural Science Foundation of China (21301083, J1210001), Fundamental Research Funds for the Central Universities of China (lzujbky-2013-54), Specialized Research Fund for the Doctoral Program of Higher Education (20130211120032), Special Foundation for High Level Waste Disposal in China (2012-494) are gratefully appreciated.
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Hou, Z., Shi, K., Wang, X. et al. Investigation of Se(IV) sorption on Na-kaolinite: batch experiments and modeling. J Radioanal Nucl Chem 303, 25–31 (2015). https://doi.org/10.1007/s10967-014-3317-5
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DOI: https://doi.org/10.1007/s10967-014-3317-5