Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (8): 2101-2107.doi: 10.3866/PKU.WHXB201604146

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

Wei-Jin YUAN1,2,Zhen DONG1,2,Long ZHAO1,2,*(),Tian-Lin YU3,Mao-Lin ZHAI3   

  1. 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:2016-03-08 Published:2016-07-29
  • Contact: Long ZHAO;
  • Supported by:
    the National Natural Science Foundation of China(11475112);Hubei 2011 Non-power Nuclear Technology Collaborative Innovation Plan, China


Theγ-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.

Key words: CMPO, Ionic liquid, Extraction, Radiolysis study, Semi-quantitative analysis


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