Extraction of lanthanide ions from aqueous solution by bis(2-ethylhexyl)phosphoric acid with room-temperature ionic liquids
作者： Sang Jun Yoon , Jae Goo Lee , Hideo Tajima , Akihiro Yamasaki , Fumio Kiyono
DOI: 10.1016/J.JIEC.2009.09.063
关键词: Inorganic chemistry 、 Ionic radius 、 Lanthanide 、 Aqueous solution 、 Hexane 、 Ionic liquid 、 Phosphoric acid 、 Chemistry 、 Metal ions in aqueous solution 、 Partition coefficient
摘要: Abstract Extractions of five kinds lanthanide metal ions by bis(2-ethylhexyl)phosphoric acid (DEHPA) with [1-Cn-3-methylimidazolium][PF 6 ](Cn = C 2 , C 4 ) or [1-butyl-4-methylpyridinium][PF ] were carried out under various DEHPA and HNO 3 concentrations from 0 to 1 M different temperature conditions 298 333 K. These results compared those using the conventional organic solvent, hexane, in terms their distribution coefficient values. Under all this study, ionic liquid system shows more than three times greater extractability for when hexane was used. The decreased as length alkyl chain increased ethyl butyl. In addition, imidazolium cation generally a higher pyridinium an liquid. concentration ratio lanthanides resulted extraction affinity transition lanthanides. Also evaluated study issues related selectivity associated mixture dependency radius during extraction.
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