A novel extractant bis（2-ethylhexyl）（（2-ethylhexylamino）methyl） phosphine oxide for cerium（Ⅳ） extraction and separation from sulfate medium
来源期刊：Journal of Rare Earths2020年第12期
论文作者：Mingxia Huang Yongmei Fu Youcai Lu Wuping Liao Zhongjun Li
文章页码：1330 - 1336
摘 要：By introducing the amine group into phosphorus extractant,a novel aminophosphine compound bis（2-ethylhexyl）（（2-ethylhexylamino）methyl） phosphine oxide（DEHAPO,abbreviated as A） was synthesized for the extraction of cerium（Ⅳ）（Ce（Ⅳ）） from sulfate medium（H2 SO4）.The influence factors including extractant concentration,H2 SO4 concentration and temperature on the Ce（Ⅳ） extraction were investigated and discussed.It is found that the extraction ability of Ce（Ⅳ）,thorium（Ⅳ）（Th（Ⅳ）） and rare earths（REs（Ⅲ））（La,Gd,Yb） decreases in sulphate medium in the following order:Ce（Ⅳ）> Th（Ⅳ）> REs（Ⅲ）.The extraction process is an exothermic reaction and the thermodynamic parameters were calculated.The extracted complex of Ce（HSO4）2 SO4·A in loaded organic solution was identified by the slope methods and further proved by FT-IR spectral analysis.Stripping studies indicate that Ce（IV） can be effectively stripped from the organic phase.The results of separation factors（β） and saturation loading capacity demonstrate that DEHAPO could be used to selectively extract Ce（Ⅳ） from sulphate medium with high separation efficiency and good extraction ability.
Mingxia Huang1，Yongmei Fu1，Youcai Lu1，Wuping Liao2，Zhongjun Li1
1. College of Chemistry,Zhengzhou University2. State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences
摘 要：By introducing the amine group into phosphorus extractant,a novel aminophosphine compound bis（2-ethylhexyl）（（2-ethylhexylamino）methyl） phosphine oxide（DEHAPO,abbreviated as A） was synthesized for the extraction of cerium（Ⅳ）（Ce（Ⅳ）） from sulfate medium（H2 SO4）.The influence factors including extractant concentration,H2 SO4 concentration and temperature on the Ce（Ⅳ） extraction were investigated and discussed.It is found that the extraction ability of Ce（Ⅳ）,thorium（Ⅳ）（Th（Ⅳ）） and rare earths（REs（Ⅲ））（La,Gd,Yb） decreases in sulphate medium in the following order:Ce（Ⅳ）> Th（Ⅳ）> REs（Ⅲ）.The extraction process is an exothermic reaction and the thermodynamic parameters were calculated.The extracted complex of Ce（HSO4）2 SO4·A in loaded organic solution was identified by the slope methods and further proved by FT-IR spectral analysis.Stripping studies indicate that Ce（IV） can be effectively stripped from the organic phase.The results of separation factors（β） and saturation loading capacity demonstrate that DEHAPO could be used to selectively extract Ce（Ⅳ） from sulphate medium with high separation efficiency and good extraction ability.
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