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Solvent extraction of U(VI) by trioctylphosphine oxide using a room-temperature ionic liquid
Yuan LY(袁立永); Sun M(孙曼); Liao XH(廖翔鸿); Yuan, LY; Sun, M; Liao, XH; Zhao, YL; Chai, ZF; Shi, WQ; Zhao YL(赵宇亮); Chai ZF(柴之芳); Shi WQ(石伟群)
AbstractThe unique physical and chemical properties of room-temperature ionic liquids (RTILs) have recently received increasing attention as solvent alternatives for possible application in the field of nuclear industry, particularly in liquid-liquid separations of radioactive nuclides. We investigated solvent extraction of U(VI) from aqueous solutions into a commonly used ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(4)mim][NTf2]) using trioctylphosphine oxide (TOPO) as an extractant. The effects of contact time, TOPO concentration, acidity, and nitrate ions on the U(VI) extraction are discussed in detail. The extraction mechanism was proposed based on slope analysis and UV-Vis measurement. The results clearly show that TOPO/[C(4)mim][NTf2] provides a highly efficient extraction of U(VI) from aqueous solution under near-neutral conditions. When the TOPO concentration was 10 mmol/L, the extraction of 1 mmol/L U(VI) was almost complete (> 97%). Both the extraction efficiency and distribution coefficient were much larger than in conventional organic solvents such as dichloromethane. Slope analysis confirmed that three TOPO molecules in [C(4)mim][NTf2] bound with one U(VI) ion and one nitrate ion was also involved in the complexation and formed the final extracted species of [UO2(NO3)(TOPO)(3)](+). Such a complex suggests that extraction occurs by a cation-exchange mode, which was subsequently evidenced by the fact that the concentration of C(4)mim(+) in the aqueous phase increased linearly with the extraction percent of U(VI) recorded by UV-Vis measurement.
Keyworduranium solvent extraction ionic liquid trioctylphosphine oxide
Subject AreaChemistry
Indexed BySCI
WOS IDWOS:000345095600002
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Document Type期刊论文
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GB/T 7714
Yuan LY,Sun M,Liao XH,et al. Solvent extraction of U(VI) by trioctylphosphine oxide using a room-temperature ionic liquid[J]. SCIENCE CHINA-CHEMISTRY,2014,57(11):1432-1438.
APA 袁立永.,孙曼.,廖翔鸿.,Yuan, LY.,Sun, M.,...&石伟群.(2014).Solvent extraction of U(VI) by trioctylphosphine oxide using a room-temperature ionic liquid.SCIENCE CHINA-CHEMISTRY,57(11),1432-1438.
MLA 袁立永,et al."Solvent extraction of U(VI) by trioctylphosphine oxide using a room-temperature ionic liquid".SCIENCE CHINA-CHEMISTRY 57.11(2014):1432-1438.
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