The extraction behavior of several lanthanides（La^3＋, Eu^3＋, Lu^3＋） from nitric acid（HNO3） solution was studied using a novel extraction system based on 2,6-bis（5,6-dihexyl-1,2,4-triazin-3-yl） pyridine（isohe...The extraction behavior of several lanthanides（La^3＋, Eu^3＋, Lu^3＋） from nitric acid（HNO3） solution was studied using a novel extraction system based on 2,6-bis（5,6-dihexyl-1,2,4-triazin-3-yl） pyridine（isohexyl-BTP） as extractant in 1-alkyl-3-methylimidazolium bis（trifluoromethylsufonyl）imide（[Cnmim][NTf2]） ionic liquid. Isohexyl-BTP in ionic liquids exhibited remarkably better extraction performance for lanthanides than that in octanol-dodecane（3：7 v/v） system. Lower HNO3 concentration and short alkyl chain length of [Cnmim]^＋ were more favourable for removal of lanthanides. Besides, it was confirmed that isohexyl-BTP in ILs formed a 1：3 complex [Ln（BTP）3（NO3）n]^（3–n）＋（n=0, 1） by slope analysis. In addition, [C2mim][NTf2] preferred to extract lanthanides via a cation exchange mechanism at lower acidity, which was proved via UV-Vis measurement. It was speculated that extraction mechanism shifted from cation exchange to neutral species extraction with increase in HNO3 concentration and alkyl chain length of [Cnmim]^＋ due to the H^＋ completion, NO3^- inhibition and hydrophobicity of IL.展开更多
Extraction behavior of lanthanides(La, Eu, Dy, Lu) from HNO3 solution was studied using a novel extraction system with hydrophobic ionic liquid being diluent and isobutyl-BTP being extractant. Compared with that in is...Extraction behavior of lanthanides(La, Eu, Dy, Lu) from HNO3 solution was studied using a novel extraction system with hydrophobic ionic liquid being diluent and isobutyl-BTP being extractant. Compared with that in isobutyl-BTP/cyclohexane extraction system, application of ionic liquid as the extracting phase provided unprecedented enhancement of the extraction performance of isobutyl-BTP for lanthanides. It was found that the isobutyl-BTP/[Cnmim][NTf2] extraction system is favorable to get good extraction at low acidity condition(< 0.1 M). Of all the isobutyl-BTP/ [C n mim][NTf2](n = 2, 6, 8) systems, isobutyl-BTP/[C2mim][NTf2]extraction system provides the best extraction performance and fastest extraction kinetics within 5 min towards Dy3+. The extraction is spontaneous endothermic and temperature is good for extraction. The transfer of lanthanides, in isobutyl-BTP/[C2mim][NTf2] extraction system, proceeded via a cation exchange mechanism, in contrast to extraction of neutral complex in the cyclohexane system.展开更多
The water-soluble radiolytic products of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid([C2mim][NTf2]) under γ-radiation, such as CF3 SOOH, CF3SO2NH2, HF, and H2SO3, were identified by us...The water-soluble radiolytic products of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid([C2mim][NTf2]) under γ-radiation, such as CF3 SOOH, CF3SO2NH2, HF, and H2SO3, were identified by using1 H NMR,19 F 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 SO2–3). Washing irradiated[C2mim][NTf2] with water provides a simple method for ionic liquid recycling.展开更多
基金supported by the National Natural Science Foundation of China(11475112)the Ph.D.Programs of Foundation of Ministry of Education of China(20130073120051)
文摘The extraction behavior of several lanthanides（La^3＋, Eu^3＋, Lu^3＋） from nitric acid（HNO3） solution was studied using a novel extraction system based on 2,6-bis（5,6-dihexyl-1,2,4-triazin-3-yl） pyridine（isohexyl-BTP） as extractant in 1-alkyl-3-methylimidazolium bis（trifluoromethylsufonyl）imide（[Cnmim][NTf2]） ionic liquid. Isohexyl-BTP in ionic liquids exhibited remarkably better extraction performance for lanthanides than that in octanol-dodecane（3：7 v/v） system. Lower HNO3 concentration and short alkyl chain length of [Cnmim]^＋ were more favourable for removal of lanthanides. Besides, it was confirmed that isohexyl-BTP in ILs formed a 1：3 complex [Ln（BTP）3（NO3）n]^（3–n）＋（n=0, 1） by slope analysis. In addition, [C2mim][NTf2] preferred to extract lanthanides via a cation exchange mechanism at lower acidity, which was proved via UV-Vis measurement. It was speculated that extraction mechanism shifted from cation exchange to neutral species extraction with increase in HNO3 concentration and alkyl chain length of [Cnmim]^＋ due to the H^＋ completion, NO3^- inhibition and hydrophobicity of IL.
基金Supported by the National Natural Science Foundation of China(Nos.91126006 and 11475112)the Ph.D.Programs Foundation of Ministry of Education of China(No.20130073120051)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning
文摘Extraction behavior of lanthanides(La, Eu, Dy, Lu) from HNO3 solution was studied using a novel extraction system with hydrophobic ionic liquid being diluent and isobutyl-BTP being extractant. Compared with that in isobutyl-BTP/cyclohexane extraction system, application of ionic liquid as the extracting phase provided unprecedented enhancement of the extraction performance of isobutyl-BTP for lanthanides. It was found that the isobutyl-BTP/[Cnmim][NTf2] extraction system is favorable to get good extraction at low acidity condition(< 0.1 M). Of all the isobutyl-BTP/ [C n mim][NTf2](n = 2, 6, 8) systems, isobutyl-BTP/[C2mim][NTf2]extraction system provides the best extraction performance and fastest extraction kinetics within 5 min towards Dy3+. The extraction is spontaneous endothermic and temperature is good for extraction. The transfer of lanthanides, in isobutyl-BTP/[C2mim][NTf2] extraction system, proceeded via a cation exchange mechanism, in contrast to extraction of neutral complex in the cyclohexane system.
基金Supported by the Ph.D.Programs Foundation of Ministry of Education of China(No.20130073120051)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learningthe National Natural Science Foundation of China(No.11475112)
文摘The water-soluble radiolytic products of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid([C2mim][NTf2]) under γ-radiation, such as CF3 SOOH, CF3SO2NH2, HF, and H2SO3, were identified by using1 H NMR,19 F 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 SO2–3). Washing irradiated[C2mim][NTf2] with water provides a simple method for ionic liquid recycling.
