title: Performances and mechanistic investigations of a triphosphine trioxide/ionic liquid system for rare earth extraction.
abstract: The extraction of rare earth elements (REEs) from nitric acid solution with a triphosphine trioxide (TPO) is presented. Performances of such a ligand in ionic liquids vs. a classical solvent (benzyl ether) are compared. TPO seems to be 10 to 100 times more efficient when it is dissolved in ionic media whatever the concentration of nitric acid involved. Mechanistic investigations reveal that cation exchange classically observed in ionic liquids is not consistent with the experimental data. Moreover, clear differences in the TPO/Ln complexes between classical and ionic media are highlighted. A stable complex of 1 lanthanide for 3 TPO is formed in an ionic liquid whereas a complex of 1 lanthanide for 6 to 9 TPO is formed in benzyl ether. Back extraction is also studied and good recovery of REEs could be obtained. The TPO/ionic liquid system shows remarkable performances i.e. efficiency and selectivity towards lanthanides in a simulated leaching solution of a Nd/Fe/B/Dy magnet.
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-CNRS-UM-ENSCM, Laboratoire de Tri ionique par les Systèmes Moléculaires auto-assemblés, Site de Marcoule, BP17171, 30207 Bagnols sur Cèze, France. guilhem.arrachart@cea.fr stephane.pellet-rostaing@cea.fr.
authors.forename: R
authors.initials: R
authors.lastname: Turgis
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-CNRS-UM-ENSCM, Laboratoire de Tri ionique par les Systèmes Moléculaires auto-assemblés, Site de Marcoule, BP17171, 30207 Bagnols sur Cèze, France. guilhem.arrachart@cea.fr stephane.pellet-rostaing@cea.fr.
authors.forename: G
authors.initials: G
authors.lastname: Arrachart
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-CNRS-UM-ENSCM, Laboratoire de Tri ionique par les Systèmes Moléculaires auto-assemblés, Site de Marcoule, BP17171, 30207 Bagnols sur Cèze, France. guilhem.arrachart@cea.fr stephane.pellet-rostaing@cea.fr.
authors.forename: V
authors.initials: V
authors.lastname: Dubois
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-CNRS-UM-ENSCM, Laboratoire de Tri ionique par les Systèmes Moléculaires auto-assemblés, Site de Marcoule, BP17171, 30207 Bagnols sur Cèze, France. guilhem.arrachart@cea.fr stephane.pellet-rostaing@cea.fr.
authors.forename: S
authors.initials: S
authors.lastname: Dourdain
authors.affiliation: Institut Charles Gerhardt - UMR 5253 - équipe AM2N, ENSCM, 8 rue de l'Ecole Normale, 34 296 Montpellier Cedex 5, France.
authors.forename: D
authors.initials: D
authors.lastname: Virieux
authors.affiliation: Université de Lorraine, Institut Jean Lamour, UMR CNRS 7198, Groupe Chimie et Electrochimie des Matériaux, 1 boulevard Arago, 57078 Metz Cedex 3, France.
authors.forename: S
authors.initials: S
authors.lastname: Michel
authors.affiliation: Université de Lorraine, Institut Jean Lamour, UMR CNRS 7198, Groupe Chimie et Electrochimie des Matériaux, 1 boulevard Arago, 57078 Metz Cedex 3, France.
authors.forename: S
authors.initials: S
authors.lastname: Legeai
authors.affiliation: Université de Savoie Mont Blanc, Laboratoire de Chimie Moléculaire et Environnement, Campus Scientifique Savoie Technolac, 73376 Le Bourget du Lac Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Lejeune
authors.affiliation: Université de Savoie Mont Blanc, Laboratoire de Chimie Moléculaire et Environnement, Campus Scientifique Savoie Technolac, 73376 Le Bourget du Lac Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Draye
authors.affiliation: Institut de Chimie Séparative de Marcoule, UMR 5257, CEA-CNRS-UM-ENSCM, Laboratoire de Tri ionique par les Systèmes Moléculaires auto-assemblés, Site de Marcoule, BP17171, 30207 Bagnols sur Cèze, France. guilhem.arrachart@cea.fr stephane.pellet-rostaing@cea.fr.
authors.forename: S
authors.initials: S
authors.lastname: Pellet-Rostaing