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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| Authors: | Tadayuki Takahashi Tatsuya Ito Seong-Yun Kim |
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| Institution: | 1.Department of Quantum Science and Energy Engineering, Graduate School of Engineering,Tohoku University,Sendai,Japan;2.Japan Nuclear Fuel Limited,Aomori,Japan |
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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-calix4]arene (calix4]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 calix4]arene-R14/C n mim]NTf2] system showed a higher extraction efficiency (ECs) than that exhibited by the conventional calix4]arene-R14/dichloromethane system. All extraction processes reached equilibrium within 5 min. Slope analysis revealed that the Cs:calix4]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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