Four ionic liquids （ILs）： 3-（diethoxyphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3P（OEt）2][PF6] （IL-1）, 3-（ethoxyphenylphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3...Four ionic liquids （ILs）： 3-（diethoxyphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3P（OEt）2][PF6] （IL-1）, 3-（ethoxyphenylphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3PPh（OEt）][PF6] （IL-2）, 3-（diphenylphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3P（Ph）2][PF6] （IL-3）, and 3-（diethoxyphosphoryl）propyl triphenylphosphinium bis（trifluoromethanesulfonyl）imide [Ph3PC3P（OEt）2][NTf2] （IL-4） were synthesized and characterized by IR and 31p, 1H, 13C NMR spectroscopy. The liquid-liquid extraction of neodymium（Ⅲ） by these phosphorus functionalized ionic liquids （PFILs） diluted with common room temperature ionic liquid 1-hexyl-3-methylimidazolium bis（trifluoromethylsulfonyl）imide [C6mim][NTf2] was studied. The extraction percentage of Nd（Ⅲ） was measured as a fimction of various parameters, such as the ini- tial pH of aqueous phase, equilibrium time, temperature, and concentration of PFIL extractant. The influence of the nature of diluents and salting-out reagents on extraction was also investigated. The results indicated that the extraction process was exothermical and the extraction percentage of Nd（Ⅲ） by IL-1 was the highest among the PFILs investigated. A possible metal complexation mechanism was proposed for the present PFIL/IL extraction system. And the loaded Nd（Ⅲ） ions by PFIL could be stripped completely from the ionic liquid phase by 1 mol/L nitric acid.展开更多
基金supported by Natural Science Foundation of Zhejiang Province(Y4100113)2014 Regional Demonstration Project of Marine Economic Development of Ministry of Finance PRC and State Oceanic Administra tion PRC
文摘Four ionic liquids （ILs）： 3-（diethoxyphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3P（OEt）2][PF6] （IL-1）, 3-（ethoxyphenylphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3PPh（OEt）][PF6] （IL-2）, 3-（diphenylphosphoryl）propyl triphenylphosphinium hexafluorophosphate [Ph3PC3P（Ph）2][PF6] （IL-3）, and 3-（diethoxyphosphoryl）propyl triphenylphosphinium bis（trifluoromethanesulfonyl）imide [Ph3PC3P（OEt）2][NTf2] （IL-4） were synthesized and characterized by IR and 31p, 1H, 13C NMR spectroscopy. The liquid-liquid extraction of neodymium（Ⅲ） by these phosphorus functionalized ionic liquids （PFILs） diluted with common room temperature ionic liquid 1-hexyl-3-methylimidazolium bis（trifluoromethylsulfonyl）imide [C6mim][NTf2] was studied. The extraction percentage of Nd（Ⅲ） was measured as a fimction of various parameters, such as the ini- tial pH of aqueous phase, equilibrium time, temperature, and concentration of PFIL extractant. The influence of the nature of diluents and salting-out reagents on extraction was also investigated. The results indicated that the extraction process was exothermical and the extraction percentage of Nd（Ⅲ） by IL-1 was the highest among the PFILs investigated. A possible metal complexation mechanism was proposed for the present PFIL/IL extraction system. And the loaded Nd（Ⅲ） ions by PFIL could be stripped completely from the ionic liquid phase by 1 mol/L nitric acid.
