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Selective extraction of Cs(I) using 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene in ionic liquid solvents and its application to the treatment of high-level liquid waste

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Abstract

To separate heat-generating Cs from high-level liquid waste (HLLW), the extraction of Cs(I) using 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (calix[4]arene-R14) in combination with 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) ionic liquids ([C n mim][NTf2], where n = 2, 4, and 6) was investigated. Under moderately acidic conditions, the calix[4]arene-R14/[C n mim][NTf2] system showed a higher extraction efficiency (ECs) than that exhibited by the conventional calix[4]arene-R14/dichloromethane system. All extraction processes reached equilibrium within 5 min. Slope analysis revealed that the Cs:calix[4]arene-R14 inclusion complex has a 1:1 stoichiometry. The extraction was found to be exothermic and influenced by the presence of Na(I). These extraction systems exhibited high efficiency and selectivity for Cs(I) in simulated HLLW.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number 16H02444.

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Authors and Affiliations

  1. Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2 Aza-Aoba-Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan

    Tadayuki Takahashi, Tatsuya Ito & Seong-Yun Kim

  2. Japan Nuclear Fuel Limited, 4-108 Aza-Okitsuke, Oaza Obuchi, Rokkasyo-mura, Kamikita-gun, Aomori, 039-3212, Japan

    Tadayuki Takahashi

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  1. Tadayuki Takahashi
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  2. Tatsuya Ito
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  3. Seong-Yun Kim
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Correspondence to Seong-Yun Kim.

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Takahashi, T., Ito, T. & Kim, SY. Selective extraction of Cs(I) using 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene in ionic liquid solvents and its application to the treatment of high-level liquid waste. J Radioanal Nucl Chem 316, 1067–1073 (2018). https://doi.org/10.1007/s10967-018-5876-3

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  • DOI: https://doi.org/10.1007/s10967-018-5876-3

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