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Radiation Effect of Carboxyl-Functionalized Task-Specific Ionic Liquids on UO22+ Removal: Experimental Study with DFT Validation

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journal contribution
posted on 26.01.2017, 00:00 by Yinyong Ao, Jian Chen, Yue Wang, Hongbing Chen, Jiuqiang Li, Maolin Zhai
Experimental study with DFT validation on the effect of radiation on 1-carboxymethyl-3-methylimidazolium bis­(trifluoromethylsulfonyl) imide ([HOOCCH2MIM]­[NTf2]) as a solvent and extractant in rapid homogeneous extraction of UO22+ was performed for the first time. The radiolytic products of the anions and cations of [HOOCCH2MIM]­[NTf2] were identified by 19F NMR and high-resolution ESI-MS, respectively, and they were attributed to a decrease in UO22+ partitioning. Experimental study with DFT validation for complexing reactions between [HOOCCH2MIM]­[NTf2] and radiolytic products proved that F competition was one of the main reasons for the decrease in UO22+ partitioning. However, UO22+ partitioning in irradiated [HOOCCH2MIM]­[NTf2] can largely be recovered after thorough water washing because of the removal of radiolytic products of [NTf2].