Enhancing extraction ability by rational design of phosphoryl functionalized ionic liquids and mechanistic investigation on neodymium (III) extraction

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• 作者：Junping WANG ((王君平)) ; Jieying ZHAO ((赵洁莹)) ; Da FENG ((冯 达)) ; Xinchun KANG ((康鑫淳)) ; Yunyu SUN ((孙云雨)) ; Lingling ZHAO ((赵玲玲)) ; Hongze LIANG ((梁洪泽)) ; ^{lianghongze@nbu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ionic liquids ; extraction ; metal-solvate ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：34
• 期：1
• 页码：83-90
• 全文大小：772 K

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 function of various parameters, such as the initial 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.