Extraction of lanthanides from aqueous solution by using room-temperature ionic liquid and supercritical carbon dioxide in conjunction |
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Authors: | Mekki Soufiane Wai Chien M Billard Isabelle Moutiers Gilles Burt James Yoon Byunghoon Wang Joanna S Gaillard Clotilde Ouadi Ali Hesemann Peter |
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Affiliation: | IReS, CNRS/IN2P3-ULP Chimie Nucléaire, B.P. 28, 67037 Strasbourg Cedex 2, France. soufiane.mekki@ires.in2p3.fr |
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Abstract: | 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 beta-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. |
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Keywords: | carbon dioxide ionic liquids lanthanides metal extraction supercritical fluids |
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