title: Extraction of lanthanides from aqueous solution by using room-temperature ionic liquid and supercritical carbon dioxide in conjunction.
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.
authors.affiliation: IReS, CNRS/IN2P3-ULP Chimie Nucléaire, B.P. 28, 67037 Strasbourg Cedex 2, France. soufiane.mekki@ires.in2p3.fr
authors.forename: Soufiane
authors.initials: S
authors.lastname: Mekki
authors.forename: Chien M
authors.initials: CM
authors.lastname: Wai
authors.forename: Isabelle
authors.initials: I
authors.lastname: Billard
authors.forename: Gilles
authors.initials: G
authors.lastname: Moutiers
authors.forename: James
authors.initials: J
authors.lastname: Burt
authors.forename: Byunghoon
authors.initials: B
authors.lastname: Yoon
authors.forename: Joanna S
authors.initials: JS
authors.lastname: Wang
authors.forename: Clotilde
authors.initials: C
authors.lastname: Gaillard
authors.forename: Ali
authors.initials: A
authors.lastname: Ouadi
authors.forename: Peter
authors.initials: P
authors.lastname: Hesemann