A novel method for synthesis of styryl phosphonate monoester and its application in La(Ⅲ) extraction
来源期刊：JOURNAL OF RARE EARTHS2020年第6期
论文作者：Kaihua Huang Yun Jia Shuai Wang Jia Yang Hong Zhong
文章页码：649 - 656
摘 要：Herein,styryl phosphonate monoester（SPE） was synthesized and first introduced as rare earth extractant.The solvent extraction of lanthanum（Ⅲ） from nitrate solution using styryl phosphonate mono-isooctyl ester（SPE108）,di-2-ethylhexyl phosphoric acid（D2 EHPA） and 2-ethylhexyl phosphonic acidmono-2-ethylhexyl ester（EHEHPA） as extractants was investigated.The effects of experimental parameters including equilibrium time,extractant concentration,aqueous pH,phase ratio and salt concentration on the extraction process were studied.The results indicate that the extraction ability and capacity of the extractants follow the order:SPE108> D2 EHPA> EHEHPA.What’s more,the extraction process is less affected by ammonium sulfate in the aqueous phase with SPE108.The results of the separation between lanthanum and adjacent lanthanides（Ce,Pr,Nd,Sm） show that SPE108 can separate lanthanides efficiently at low pH.The extraction mechanism of SPE108 is proved to be similar to D2 EHPA,and the density functional theory（DFT） calculation results infer that SPE108 exhibits superior extraction ability due to its strong electron-accepting ability.
Kaihua Huang，Yun Jia，Shuai Wang，Jia Yang，Hong Zhong
College of Chemistry and Chemical Engineering,Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources,Central South University
摘 要：Herein,styryl phosphonate monoester（SPE） was synthesized and first introduced as rare earth extractant.The solvent extraction of lanthanum（Ⅲ） from nitrate solution using styryl phosphonate mono-isooctyl ester（SPE108）,di-2-ethylhexyl phosphoric acid（D2 EHPA） and 2-ethylhexyl phosphonic acidmono-2-ethylhexyl ester（EHEHPA） as extractants was investigated.The effects of experimental parameters including equilibrium time,extractant concentration,aqueous pH,phase ratio and salt concentration on the extraction process were studied.The results indicate that the extraction ability and capacity of the extractants follow the order:SPE108> D2 EHPA> EHEHPA.What’s more,the extraction process is less affected by ammonium sulfate in the aqueous phase with SPE108.The results of the separation between lanthanum and adjacent lanthanides（Ce,Pr,Nd,Sm） show that SPE108 can separate lanthanides efficiently at low pH.The extraction mechanism of SPE108 is proved to be similar to D2 EHPA,and the density functional theory（DFT） calculation results infer that SPE108 exhibits superior extraction ability due to its strong electron-accepting ability.
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