Citation: LIU Hai-Wang, SHEN Xing-Hai, CHEN Qing-De. Extraction Mechanism and Selectivity of UO₂(NO₃)₂ in Tributylphosphine Oxide-Ionic Liquid System[J]. Acta Physico-Chimica Sinica, ;2015, 31(5): 843-851. doi: 10.3866/PKU.WHXB201503202 shu

Extraction Mechanism and Selectivity of UO₂(NO₃)₂ in Tributylphosphine Oxide-Ionic Liquid System

1.
Beijing National Laboratory for Molecular Sciences, Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 13 January 2015
Available Online: 20 March 2015
Fund Project: 国家自然科学基金(91226112)资助项目 (91226112)

The extraction of UO₂(NO₃)₂ from aqueous solution was investigated using trioctylphosphine oxide (TOPO) and tributylphosphine oxide (TBPO) in ionic liquids (ILs) (C_nmimNTf₂, n=2, 4, 6, 8). A third phase was formed in the TOPO-C₂mimNTf₂ and TOPO-C₄mimNTf₂ extraction systems, whereas the extracted species of TBPO-C_nmimNTf₂ (n=2, 4, 6, 8) were well soluble in all ILs. The influence of the concentrations of the extractant, nitric acid, and salt on the extraction efficiency was also investigated. Adding HNO₃ to the aqueous phase decreased the extraction efficiency. The effect of salt indicates the presence of a cation-exchange mechanism in the extraction. The addition of NO₃ - in the aqueous phase increased the extraction efficiency of U, which indicates that NO₃ - participates in the extraction. Selective extraction research indicates that TBPO-C₄mimNTf₂ exhibits od selectivity for U at low acid concentration despite the significant extraction efficiency on Zr at high acid concentration. After removing U, TBPO-C₄mimNTf₂ still showed high selectivity for Nd at low acid concentration. We also confirmed the difference of the extraction mechanisms among TBPO-C_nmimNTf₂ by quantitative measurement of NNO₃ - in ILs, electrospray ionization mass spectroscopy (ESI- MS), and UV spectroscopy. There are two extraction species (UO₂(TBPO)₃(NO₃)⁺ and UO₂(TBPO)₃²⁺) and the proportion of UO₂(TBPO)₃(NO₃)⁺ increases from C₂mimNTf₂ to C₈mimNTf₂.
- Uranium,
- Ionic liquid,
- Extraction third phase,
- Extraction selectivity,
- Extraction mechanism
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Extraction Mechanism and Selectivity of UO2(NO3)2 in Tributylphosphine Oxide-Ionic Liquid System

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Extraction Mechanism and Selectivity of UO₂(NO₃)₂ in Tributylphosphine Oxide-Ionic Liquid System