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U(VI) sorption on kaolinite: effects of pH, U(VI) concentration and oxyanions

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Abstract

U(VI) sorption on kaolinite was studied as functions of contact time, pH, U(VI) concentration, solid-to-liquid ratio (m/V) by using a batch experimental method. The effects of sulfate and phosphate on U(VI) sorption were also investigated. It was found that the sorption kinetics of U(VI) can be described by a pseudo-second-order model. Potentiometric titrations at variable ionic strengths indicated that the titration curves of kaolinite were not sensitive to ionic strength, and that the pH of the zero net proton charge (pHPZNPC) was at 6.9. The sorption of U(VI) on kaolinite increased with pH up to 6.5 and reached a plateau at pH >6.5. The presence of phosphate strongly increased U(VI) sorption especially at pH <5.5, which may be due to formation of ternary surface complexes involving phosphate. In contrast, the presence of sulfate did not cause any apparent effect on U(VI) sorption. A double layer model was used to interpret both results of potentiometric titrations and U(VI) sorption on kaolinite.

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Acknowledgments

The financial support by the National Natural Science Foundation of China (Nos. 20971061, 20501010 and J0630962) is gratefully appreciated.

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Authors and Affiliations

  1. Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, China

    Liang Gao, Ziqian Yang, Keliang Shi, Xuefeng Wang, Zhijun Guo & Wangsuo Wu

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  1. Liang Gao
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  2. Ziqian Yang
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Correspondence to Zhijun Guo.

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Gao, L., Yang, Z., Shi, K. et al. U(VI) sorption on kaolinite: effects of pH, U(VI) concentration and oxyanions. J Radioanal Nucl Chem 284, 519–526 (2010). https://doi.org/10.1007/s10967-010-0510-z

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