Solvent extraction of thorium(Ⅳ) using W/O microemulsion  

作　　者：GAO Song SHEN XingHai CHEN QingDe GAO HongCheng 

机构地区：[1]Beijing National Laboratory for Molecular Sciences(BNLMS),Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China

出　　处：《Science China Chemistry》2012年第9期1712-1718,共7页中国科学（化学英文版）

基　　金：supported by National Natural Science Foundation of China(20871009);the Fundamental Research Funds for the Central Universities

摘　　要：The extraction of thorium(IV) was investigated using two types of W/O microemulsion,one of which was formed by a surface-active saponified extractant sodium bis(2-ethylhexyl) phosphate(NaDEHP) and the other was formed by a mixture of an anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate(AOT) and an extractant bis(2-ethylhexyl)phosphoric acid(HDEHP) as the cosurfactant.The extraction capacities of the above two systems were higher than that of the HDEHP extraction system.High concentration of NaNO 3 showed no influence on the extraction in the NaDEHP based W/O microemulsion system,whilst reduced the extractability in the AOT-HDEHP W/O microemulsion system.The mechanism in acidic condition was demonstrated by the log-log plot method.The structure of the aggregations and the water content in the organic phase after extraction were measured by dynamic light scattering and Karl Fischer water titration,respectively.It was found that NaDEHP based W/O microemulsion broke up after extraction,while AOT-HDEHP W/O microemulsion was reserved.The extraction of thorium（IV） was investigated using two types of W/O microemulsion, one of which was formed by a sur- face-active saponified extractant sodium bis（2-ethylhexyl） phosphate （NaDEHP） and the other was formed by a mixture of an anionic surfactant sodium bis（2-ethylhexyl） sulfosuccinate （AOT） and an extractant bis（2-ethylhexyl）phosphoric acid （HDEHP） as the cosurfactant. The extraction capacities of the above two systems were higher than that of the HDEHP extraction system. High concentration of NaNO3 showed no influence on the extraction in the NaDEHP based W/O microemulsion system, whilst reduced the extractability in the AOT-HDEHP W/O microemulsion system. The mechanism in acidic condition was demon- strated by the log-log plot method. The structure of the aggregations and the water content in the organic phase after extraction were measured by dynamic light scattering and Karl Fischer water titration, respectively. It was found that NaDEHP based W/O microemulsion broke up after extraction, while AOT-HDEHP W/O microemulsion was reserved.

关 键 词：W/O microemulsion thorium ions EXTRACTION 

分 类 号：TF845[冶金工程—有色金属冶金]