Radiolysis of crown ether–ionic liquid systems: identification of radiolytic products and their effect on the removal of Sr2+ from nitric acid
Literature Information
Yinyong Ao, Weijin Yuan, Tianlin Yu, Jing Peng, Jiuqiang Li, Maolin Zhai, Long Zhao
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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