Radiation Effects on Hydrophobic Ionic Liquid [C4mim][NTf2] during Extraction of Strontium Ions

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• 作者：Liyong Yuan ; Jing Peng ; Ling Xu ; Maolin Zhai ; Jiuqiang Li ; Genshuan Wei
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：July 2, 2009
• 年：2009
• 卷：113
• 期：26
• 页码：8948-8952
• 全文大小：148K
• 年卷期：v.113,no.26(July 2, 2009)
• ISSN：1520-5207

文摘

The applications of room-temperature ionic liquids (RTILs) in separation of high level radioactive nuclides demand a comprehensive knowledge of the stability and metal ion extraction of RTILs under radiation. Herein, we assessed the influence of γ-irradiation on the [C₄mim][NTf₂]-based extraction system, where [C₄mim]⁺ is 1-butyl-3-methylimidazolium and [NTf₂]⁻ is bis(trifluoromethylsulfonyl)imide, by solvent extraction of Sr²⁺ using irradiated [C₄mim][NTf₂] in combination with dicyclohexyl-18-crown-6 (DCH18C6). It was found that the degree of extraction for Sr²⁺ from water to irradiated [C₄mim][NTf₂] decreased compared with that to unirradiated [C₄mim][NTf₂], and the decrement enhanced obviously with increasing dose. NMR spectroscopic probe analysis revealed the formation of acids during irradiation of [C₄mim][NTf₂]. The decrease of Sr²⁺ partitioning in irradiated [C₄mim][NTf₂] is attributed to the competition between H⁺ with Sr²⁺ to interact with DCH18C6. Accordingly, washing irradiated [C₄mim][NTf₂] with water gives a simple way of ionic liquid recycling. Furthermore, the degree of extraction for Sr²⁺ from 3 mol·L⁻¹ nitric acid solution to [C₄mim][NTf₂] is independent of the irradiation of [C₄mim][NTf₂] since the amount of the radiation-generated H⁺ is negligible in such a high acidic solution.