The influence of the concentration of sodium oleate （NaOL） and pentanol on the water uptake of microemulsion was stuied. The effect of the concentraction of NaOL and pentanol on the extraction yield of samarium was ...The influence of the concentration of sodium oleate （NaOL） and pentanol on the water uptake of microemulsion was stuied. The effect of the concentraction of NaOL and pentanol on the extraction yield of samarium was investigated. The result shows that the extraction and concentration of samarium is effective under well-defined conditions utilizing Winsor Ⅱ microemulsioin systems. The FT-IR spectra and conductivity research may indicate that stable hydrophobic chelate complexes were produced after the extraction of Sm（Ⅲ） by NaOL micromulsion systems.展开更多
The 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, parti...The 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([C4mim][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/[C4mim][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 [C4mim][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 C4mim+ in the aqueous phase increased linearly with the extraction percent of U(VI) recorded by UV-Vis measurement.展开更多
基金Acknowledgments： This work was supported by the Nature Science Foundation of Shandong Province （No. Y2007B05）.
文摘The influence of the concentration of sodium oleate （NaOL） and pentanol on the water uptake of microemulsion was stuied. The effect of the concentraction of NaOL and pentanol on the extraction yield of samarium was investigated. The result shows that the extraction and concentration of samarium is effective under well-defined conditions utilizing Winsor Ⅱ microemulsioin systems. The FT-IR spectra and conductivity research may indicate that stable hydrophobic chelate complexes were produced after the extraction of Sm（Ⅲ） by NaOL micromulsion systems.
基金supported by the National Natural Science Foundation of China(91326202,11105162,91126006,11275219)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA030104)
文摘The 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([C4mim][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/[C4mim][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 [C4mim][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 C4mim+ in the aqueous phase increased linearly with the extraction percent of U(VI) recorded by UV-Vis measurement.
