γ-ray induced radiolysis of [C₂mim][NTf₂] and its effects on Dy³⁺ extraction

摘要: The water-soluble radiolytic products of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid ([C₂mim][NTf₂]) under γ-radiation, such as CF₃SOOH, CF₃SO₂NH₂, HF, and H₂SO₃, were identified by using ¹H NMR, ¹⁹F NMR, and ion chromatography. The extraction behavior of Dy³⁺ using irradiated [C₂mim][NTf₂] in combination with 2,6-di(5,6-diisobutyl-1,2,4-triazin-3-yl)pyridine (isobutyl-BTP) was studied and the abnormal increase of Dy³⁺ partitioning after irradiation is mainly attributed to the precipitation formed between Dy³⁺ and radiolytic products of [C₂mim][NTf₂] (F^- and SO₃^2-). Washing irradiated [C₂mim][NTf₂] with water provides a simple method for ionic liquid recycling.