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Citation: YUAN Wei-Jin, DONG Zhen, ZHAO Long, YU Tian-Lin, ZHAI Mao-Lin. γ-Ray-Induced Radiolysis of CMPO/[C₂mim][NTf₂] and Its Effect on Eu³⁺ Extraction[J]. Acta Physico-Chimica Sinica, ;2016, 32(8): 2101-2107. doi: 10.3866/PKU.WHXB201604146 shu

γ-Ray-Induced Radiolysis of CMPO/[C₂mim][NTf₂] and Its Effect on Eu³⁺ Extraction

YUAN Wei-Jin ^1,2, ,
DONG Zhen ^1,2 ,
ZHAO Long ^1,2 ,
YU Tian-Lin ³ ,
ZHAI Mao-Lin ³

1.
Non-power Nuclear Technology Research & Development Center, Hubei University of Science & Technology, Xianning 437100, Hubei Province, P. R. China;
2.
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China;
3.
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 8 March 2016
Revised Date: 14 April 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (11475112) and Hubei 2011 Non-power Nuclear Technology Collaborative Innovation Plan, China.

The γ-radiolysis of octylphenyl-(N,N-(diisobutyl)carbamoyl-methyl) phosphine oxide (CMPO) in 1- ethyl-3-methylimidazoliumbis (trifluoromethylsulfonyl) imide ([C₂mim][NTf₂]) was studied. The effect of radiation on CMPO/[C₂mim][NTf₂] extractability was also investigated. Quantitative analysis of CMPO in irradiated CMPO/ [C₂mim][NTf₂] systems, identification and semi-quantitative analysis of the radiolytic products were performed using ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS). For comparison, CMPO/dodecane was also studied under the same conditions. The radiolysis ratio of CMPO in [C₂mim][NTf₂] was found to be lower than in dodecane, because of the different radiolysis pathways. The radiolysis pathway of CMPO in molecular solvent was mainly chain scission of C―P and C―N, while that in [C₂mim][NTf₂] was the elimination of isobutyl, as well as substitution reactions with [C₂mim]^+· and ·CF₃ generated from solvent [C₂mim][NTf₂]. Based on the radiolysis study, we propose a radiolysis pathway for CMPO/[C₂mim] [NTf₂], providing a deeper understanding of the radiolytic mechanism of CMPO in ionic liquids. Finally, the Eu³⁺ partitioning of CMPO/[C₂mim][NTf₂] from 0.01 mol·L^-1 HNO3 was higher than 99% at 800 kGy.
- CMPO,
- Ionic liquid,
- Extraction,
- Radiolysis study,
- Semi-quantitative analysis
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γ-Ray-Induced Radiolysis of CMPO/[C₂mim][NTf₂] and Its Effect on Eu³⁺ Extraction