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Chemistry - A European Journal 12, 6 (2005) 1760-1766
Extraction of Lanthanides from Aqueous Solution by Using Room-Temperature Ionic Liquid and Supercritical Carbon Dioxide in Conjunction
Soufiane Mekki1, 2, 3, Chien M. Wai4, Isabelle Billard1, Gilles Moutiers3, James Burt4, Byunghoon Yoon4, Joanna S. Wang4, Clotilde Gaillard1, Ali Ouadi1, Peter Hesemann5

For the first time, the study of a three-step extraction system of water/ionic liquid/supercritical CO2 has been performed. Extraction of trivalent lanthanum and europium from an aqueous nitric acid solution to a supercritical CO2 phase via an imidazolium-based ionic liquid phase is demonstrated, and extraction efficiencies higher than 87 % were achieved. The quantitative extraction is obtained by using different fluorinated -diketones with and without the addition of tri(n-butyl)phosphate. The complexation phenomenon occurring in the room-temperature ionic-liquid (RTIL) phase was evidenced by using luminescence spectroscopy.
1 :  IReS - Institut de Recherches Subatomiques
3 :  SCP - Service de Chimie Physique
4 :  DEPARTMENT OF CHEMISTRY - University of Idaho
5 :  UMR 5076 - Hétérochimie Moléculaire et Macromoléculaire
Chimie/Chimie de coordination

Chimie/Génie chimique
carbon dioxide – ionic liquids – lanthanides – metal extraction – supercritical fluids