|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Electrochemical and Spectroscopic Study of Eu(III)/Eu(II) Couple in the Ehtylmethylimidazolium Bis(trifluromethanesulfonyl)imide Ionic Liquid
||David Bengio, Thomas Dumas, Eric Mendes, Pier Lorenzo Solari, Richard Husar, Michel Schlegel, Philippe Moisy, Stéphane Pellet-Rostaing
|On-Site Speaker (Planned)
Ionic liquids are room-temperature molten salts which demonstrate unique physico-chemical properties. They stabilize some species and allow the use of electrochemical techniques to apply redox-controlled conditions. In particular, the separation of rare-earths could be achieved by selectively modifying the oxidation state of one element. Thus, we have studied the electrolytic reduction of Eu(III) to Eu(II) by different spectroscopic techniques. First, absorption and fluorescence spectroscopies were used to monitor the electrolysis and improve the setup. Then, X-ray absorption spectroscopy (XANES and EXAFS) was used in order to provide information on the coordination state of Eu(III) and Eu(II). The influence of water concentration on Eu redox properties and speciation has also been studied. This data will be useful to develop electrochemical separation processes for rare-earths or other critical elements. To the best of our knowledge, it is the first in-situ XAS measurements during an electrolysis performed in an ionic liquid.