A novel method for synthesis of styryl phosphonate monoester and its application in La(III) extraction |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;1. Los Alamos National Laboratory, MPA-CMMS Group, Mailstop K764, Los Alamos, NM 87545, USA;2. Temple University, Philadelphia, PA 19121, USA;1. School of Civil Engineering, Central South University, Changsha 410075, China;2. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China;3. Department of Dam Safety Management, Nanjing Hydraulic Research Institute, Nanjing 210029, China;4. High Speed Railway Section, Guangzhou Railway (Group) Corporation, Guangzhou 510030, China |
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| Abstract: | 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-iso-octyl ester (SPE108), di-2-ethylhexyl phosphoric acid (D2EHPA) and 2-ethylhexyl phosphonic acid-mono-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 > D2EHPA > 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 D2EHPA, 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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| Keywords: | Styryl phosphonate monoester Rare earth Extraction Extractant |
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