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