title: α-Radiolysis of ionic liquid irradiated with helium ion beam and the influence of radiolytic products on Dy3+ extraction.
abstract: Helium ion (He(+)) beam produced by a heavy ion linear accelerator was used to simulate α-rays for studying the radiation effect on 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid ([C4mim][NTf2]). The water-soluble radiolytic products of [C4mim][NTf2] under He(+) beam irradiation were analysed, and it was found that they were similar to those by γ-ray irradiation, but their amount was much less than that by γ-ray irradiation, which was attributed to the recombination of [C4mim][NTf2] radical cations in track by high linear energy transfer (LET) radiations of the He(+) beam. The extracting behaviour of Dy(3+) using irradiated [C4mim][NTf2] in combination with alkylated bis-triazinyl-pyridine (CA-BTP) was assessed, and found that the influence of He(+) beam on the extraction was less than that of γ-ray irradiation. In addition, radiolytic products have a different influence on Dy(3+) extraction at different doses; Dy(3+) partitioning decreases at 50 kGy due to the protonation of CA-BTP and the inhibition of cation exchange mechanism by radiation-formed hydrogen ions. The abnormal increase of Dy(3+) partitioning at 100 kGy is mainly attributed to the precipitation formed between Dy(3+) and radiolytic products (F(-) and SO3(2-)).
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China. mlzhai@pku.edu.cn.
authors.forename: Yinyong
authors.initials: Y
authors.lastname: Ao
authors.forename: Hanyang
authors.initials: H
authors.lastname: Zhou
authors.forename: Weijin
authors.initials: W
authors.lastname: Yuan
authors.forename: Shuojue
authors.initials: S
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Peng
authors.forename: Maolin
authors.initials: M
authors.lastname: Zhai
authors.forename: Jianyong
authors.initials: J
authors.lastname: Wang
authors.forename: Ziqiang
authors.initials: Z
authors.lastname: Zhao
authors.forename: Long
authors.initials: L
authors.lastname: Zhao
authors.forename: Yuezhou
authors.initials: Y
authors.lastname: Wei