Influence of the characteristics of a water-in-CO2 microemulsion on the separation of metal species |
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| Authors: | Joanna S Wang Chien M Wai Hwa-Kwang Yak |
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| Affiliation: | 1. Universal Technology Corporation, Dayton, Ohio, USA;2. Department of Chemistry, University of Idaho, Moscow, Idaho, USA;3. Department of Chemistry, Chung Yuan Christian University, Chung Li, Taiwan, ROC |
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| Abstract: | In this study, AOT sodium bis(2-ethylhexyl) sulfosuccinate] combined with fluorinated cosurfactant or alcohol was used to form a water-in-CO2 (W/C) microemulsion. The amount of water uptake in the microemulsion was closely related to the PFPE-PO4/AOT (P/A) ratio. The stability of the microemulsion decreased with the amount of water. Lower temperature and higher pressure stabilize W/C microemulsions. The extraction efficiencies of metals (Cd, Co, Cu, Pb, Zn), when this W/C microemulsion method was used, exceeded 90% (AOT + octanol). The efficiencies for the extraction of Eu, La, and Sr could exceed 94% (AOT + PFPE-PO4) in sc-CO2. |
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| Keywords: | Cosurfactant metal species microemulsion supercritical fluid CO2 surfactant |
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