物理化学学报 >> 2015, Vol. 31 >> Issue (Suppl): 32-38.doi: 10.3866/PKU.WHXB2014Ac10

研究论文 上一篇    下一篇

CMPO和TBP在离子液体中选择性萃取水溶液中铀酰离子的研究

孙涛祥, 沈兴海, 陈庆德   

  1. 北京大学化学与分子工程学院, 放射化学与辐射化学重点学科实验室, 北京分子科学国家实验室, 北京100871
  • 发布日期:2015-05-20
  • 通讯作者: 沈兴海 E-mail:xshen@pku.edu.cn
  • 基金资助:

    国家自然科学基金(20871009)和中央高校基本科研基金资助项目

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 E-mail:xshen@pku.edu.cn
  • Supported by:

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

摘要:

研究了以辛基(苯基)-N,N-二异丁基胺甲酰基甲基氧化膦(CMPO)和磷酸三丁酯(TBP)在离子液体(ILs)中选择性萃取水溶液中的铀酰离子(UO22+). 离子液体为1-烷基-3-甲基咪唑双三氟甲基磺酰亚胺盐(CnmimNTf2,n=2, 4, 6, 8). 水相硝酸浓度以及离子液体的取代基链长对UO22+的分配比和萃取选择性均有影响. 与TBP相比, CMPO在离子液体中对UO22+具有更高的萃取分配比和更好的萃取选择性. 对模拟废液(SLW)萃取发现,Zr4+, ReO4- 和Cs+是主要的竞争离子. ReO4-和Cs+可被离子液体本身萃取, 而Zr4+则是被CMPO和TBP萃取而不被离子液体本身萃取. 本研究工作表明, CMPO-ILs 体系在铀酰离子的选择性萃取分离中具有一定的应用前景.

关键词: 离子液体, 萃取, 分离, 选择性, 铀酰离子

Abstract:

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+

MSC2000: 

  • O645