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Extraction of Lanthanides from Aqueous Solution by Using Room‐Temperature Ionic Liquid and Supercritical Carbon Dioxide in Conjunction
Author(s) -
Mekki Soufiane,
Wai Chien M.,
Billard Isabelle,
Moutiers Gilles,
Burt James,
Yoon Byunghoon,
Wang Joanna S.,
Gaillard Clotilde,
Ouadi Ali,
Hesemann Peter
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200500559
Subject(s) - ionic liquid , extraction (chemistry) , supercritical carbon dioxide , aqueous solution , europium , supercritical fluid , chemistry , lanthanide , supercritical fluid extraction , aqueous two phase system , inorganic chemistry , nitric acid , phase (matter) , chromatography , organic chemistry , ion , catalysis
For the first time, the study of a three‐step extraction system of water/ionic liquid/supercritical CO 2 has been performed. Extraction of trivalent lanthanum and europium from an aqueous nitric acid solution to a supercritical CO 2 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 β‐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.