Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (Suppl): 32-38.doi: 10.3866/PKU.WHXB2014Ac10

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Investigation of Selective Extraction of UO22+ from Aqueous Solution by CMPO and TBP in Ionic Liquids

SUN Tao-Xiang, SHEN Xing-Hai, CHEN Qing-De   

  1. Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Published:2015-05-20
  • Contact: SHEN Xing-Hai
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20871009) and Fundamental Research Funds for the Central Universities, China.


The selective extraction of UO22+ from aqueous solution in the presence of other metal ions by octylphenyl-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) and tri-n-butyl phosphate (TBP) in ionic liquids (ILs), namely 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imides (CnmimNTf2, n=2, 4, 6, 8), were studied. The influences of the nitric acid concentration and the IL alkyl chain length on the distribution ratio and selectivity were examined. Compared with TBP in C4mimNTf2, CMPO in the ILs gave higher distribution ratios and better selectivities. Zr4+, ReO4-, and Cs+ were the main competing ions in the separation of UO22+ from simulated liquid waste (SLM) by the CnmimNTf2 systems. ReO4- and Cs+ were extracted by the ILs themselves. Zr4+ was extracted by CMPO or TBP in the ILs but not by the ILs themselves. This work gives further information on the use of ILs, and provides a basis for matching extractants with ILs in the processing of spent nuclear fuel.

Key words: Ionic liquid, Extraction, Separation, Selectivity, UO22+


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