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

doi:10.3866/PKU.WHXB2014Ac10

摘要/Abstract

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(C_nmimNTf₂,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 (C_nmimNTf₂, 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 C_nmimNTf₂ 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⁺

孙涛祥, 沈兴海, 陈庆德. 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[J]. 物理化学学报, 2015, 31(Suppl): 32-38.

SUN Tao-Xiang, SHEN Xing-Hai, CHEN Qing-De. Investigation of Selective Extraction of UO₂²⁺ from Aqueous Solution by CMPO and TBP in Ionic Liquids[J]. Acta Phys. -Chim. Sin., 2015, 31(Suppl): 32-38.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB2014Ac10

https://www.whxb.pku.edu.cn/CN/Y2015/V31/ISuppl/32

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