Radiolysis of crown ether–ionic liquid systems: identification of radiolytic products and their effect on the removal of Sr2+ from nitric acid

Yinyong Ao; Weijin Yuan; Tianlin Yu; Jing Peng; Jiuqiang Li; Maolin Zhai; Long Zhao

doi:10.1039/C4CP04294H

Radiolysis of crown ether–ionic liquid systems: identification of radiolytic products and their effect on the removal of Sr²⁺ from nitric acid†

Yinyong Ao,^a Weijin Yuan,^b Tianlin Yu,^a Jing Peng,^a Jiuqiang Li,^a Maolin Zhai*^a and Long Zhao*^b

* Corresponding authors

^a Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory for Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
E-mail: mlzhai@pku.edu.cn
Fax: +86-10-62753794
Tel: +86-10-62753794

^b Nuclear Chemical Engineering Laboratory, School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
E-mail: ryuuchou@sjtu.edu.cn
Fax: +86-21-34207654
Tel: +86-21-34207654

Abstract

The quantitative analysis and identification of the radiolytic products of dicyclohexano-18-crown-6 (DCH18C6), 4′,4′′(5′′)-di-tert-butyldicyclohexano-18-crown-6 (DtBuCH18C6) and benzo-18-crown-6 (B18C6) in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([C₄mim][NTf₂]) ionic liquid after irradiation were performed for the first time. It was found that the yield for radiolytic destruction of DCH18C6 and DtBuCH18C6 was less than that for B18C6. The main radiolytic products were identified as substituted crown ethers formed between crown ether and active radicals such as methyl, trifluoromethyl, butyl, and [C₄mim]˙ radicals generated during the irradiation of the crown ether–[C₄mim][NTf₂] system. The radiation effect on the Sr²⁺ partitioning of the crown ether–[C₄mim][NTf₂] system shows further that DCH18C6–[C₄mim][NTf₂] and DtBuCH18C6–[C₄mim][NTf₂] still have good extractability for Sr²⁺ after irradiation. The extraction ability of DCH18C6–[C₄mim][NTf₂] and DtBuCH18C6–[C₄mim][NTf₂] system for Sr²⁺ decreased by 14.4% and 18.2% even at 500 kGy, respectively.

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Article information

DOI: https://doi.org/10.1039/C4CP04294H
Article type: Paper
Submitted: 24 Sep 2014
Accepted: 08 Dec 2014
First published: 11 Dec 2014

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Phys. Chem. Chem. Phys., 2015,17, 3457-3462

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Radiolysis of crown ether–ionic liquid systems: identification of radiolytic products and their effect on the removal of Sr²⁺ from nitric acid

Y. Ao, W. Yuan, T. Yu, J. Peng, J. Li, M. Zhai and L. Zhao, Phys. Chem. Chem. Phys., 2015, 17, 3457 DOI: 10.1039/C4CP04294H

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