Extraction of europium by sodium oleate/pentanol/heptane/NaCl microemulsion system |
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| Authors: | W Wang Y Z Yang H Zhao Q W Guo W J Lu Y M Lu |
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| Institution: | (1) Key Laboratory of Special Functional Aggregated Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;(2) National Engineering Technology Research Center for Colloidal Materials, Shandong University, Jinan, 250100, China; |
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| Abstract: | The extraction of europium to a W/O microemulsion with an anionic surfactant was studied. In the sodium oleate (NaOL)/pentanol/heptane/NaCl
system, the influence of aqueous-microemulsion ratio, concentration of NaOL, extraction temperature, concentration of cosurfactant,
pH and salting-out agent on the extraction yield were investigated. Europium was probably extracted into the microemulsion
phase in the form of Eu(OL)2Cl, and the extraction yield (E%) was above 99% when R = 8. The enthalpy and entropy of Eu(III) extraction were calculated to be −12.18 kJ/mol and −61.41 J/(mol K), respectively.
The back-extraction is conducted by hydrochloric acid (0.8 mol/L), which provided better back-extraction yields (95.15%). |
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