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Sorption of uranium(VI) from aqueous solution onto magnesium silicate hollow spheres

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Abstract

The sorption of uranium(VI) from aqueous solutions was investigated using synthesized magnesium silicate hollow spheres as a novel adsorbent. Batch experiments were conducted to study the effects of initial pH, amount of adsorbent, contact time and initial U(VI) concentrations on uranium sorption efficiency. The desorbing of U(VI) and the effect of coexisting ions were also investigated. Kinetic studies showed that the sorption followed a pseudo-second-order kinetic model. The Langmuir sorption isotherm model correlates well with the uranium sorption equilibrium data for the concentration range of 25–400 mg/L. The maximum uranium sorption capacity onto magnesium silicate hollow spheres was estimated to be about 107 mg/g under the experimental conditions. Desorption of uranium was achieved using inorganic acid as the desorbing agent. The practical utility of magnesium silicate hollow spheres for U(VI) uptake was investigated with high salt concentration of intercrystalline brine. This work suggests that magnesium silicate hollow spheres can be used as a highly efficient adsorbent for removal of uranium from aqueous solutions.

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Acknowledgments

The present work was supported by National Natural Science Foundation of China (Grant no. 20901080, 10905074) and Knowledge Innovation Program of The Chinese Academy of Sciences (Grant No. KJCX2-YW-N50-3, KJCX2-YW-N49-2).

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Fangli Fan, Huajie Ding, **g Bai, **aolei Wu, Fuan Lei, Wei Tian, Yang Wang & Zhi Qin

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  1. Fangli Fan
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  2. Huajie Ding
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Correspondence to Fangli Fan.

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Fan, F., Ding, H., Bai, J. et al. Sorption of uranium(VI) from aqueous solution onto magnesium silicate hollow spheres. J Radioanal Nucl Chem 289, 367–374 (2011). https://doi.org/10.1007/s10967-011-1091-1

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