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Adsorption characteristics and radiation stability of a silica-based DtBuCH18C6 adsorbent for Sr(II) separation in HNO3 medium

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Abstract

A silica-based adsorbent, (DtBuCH18C6 + dodecanol)/SiO2-P, which is used for selective separation of Sr(II) from high level liquid wastes, against temperature and gama-irradiation was investigated. The adsorption characteristics of Sr(II), Ba(II), La(III), Nd(III), Gd(III) and Dy(III) under varying nitric acid concentration at different temperatures were measured by batch method. The adsorbent showed higher distribution coefficients (K d) for Sr(II) compared to other tested metal ions, and the K d values of Sr(II) decreased with increasing temperature. Thermodynamic parameters of the adsorption process were calculated. The related parameters in adsorption isotherm models were obtained using a non-linear fitting. Uptake capacity from 0.38 to 0.43 mmol g−1 was obtained for Sr(II) in the temperature range of 298–323 K by the Langmuir equation fitting. The leakage of total organic carbon was below 120 ppm at 298 K and 180 ppm at 323 K, respectively. The degradation of the adsorbent irradiated in 2 M HNO3 was investigated. It is found that the adsorbed dose of γ-ray more than 50 KGy has a strong influence on K d of Sr(II). The K d values of Sr(II) decrease about 3 times ranged from 50 to 500 KGy.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21261140335), Scientific Research Foundation for Youth Scholars of Shanghai Jiao Tong University (AF0200003).

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  1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Zi Chen, Yan Wu & Yuezhou Wei

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  1. Zi Chen
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  2. Yan Wu
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  3. Yuezhou Wei
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Correspondence to Yan Wu.

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Chen, Z., Wu, Y. & Wei, Y. Adsorption characteristics and radiation stability of a silica-based DtBuCH18C6 adsorbent for Sr(II) separation in HNO3 medium. J Radioanal Nucl Chem 299, 485–491 (2014). https://doi.org/10.1007/s10967-013-2750-1

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  • DOI: https://doi.org/10.1007/s10967-013-2750-1

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