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Turgis, R., Arrachart, G., Dubois, V., Dourdain, S., Virieux, D., Michel, S., Legeai, S., Lejeune, M., Draye, M. and Pellet-Rostaing, S.
Dalton Transactions, 45(Copyright (C) 2016 American Chemical Society (ACS). All Rights Reserved.):1259-1268
2016

Resume: The extn. of rare earth elements (REEs) from nitric acid soln. with a triphosphine trioxide (TPO) is presented. Performances of such a ligand in ionic liqs. 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 concn. of nitric acid involved. Mechanistic investigations reveal that cation exchange classically obsd. in ionic liqs. is not consistent with the exptl. 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 liq. whereas a complex of 1 lanthanide for 6 to 9 TPO is formed in benzyl ether. Back extn. is also studied and good recovery of REEs could be obtained. The TPO/ionic liq. system shows remarkable performances i.e. efficiency and selectivity towards lanthanides in a simulated leaching soln. of a Nd/Fe/B/Dy magnet. [on SciFinder(R)]

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Thiebaud, Laura, Legeai, Sophie and Stein, Nicolas
Electrochimica Acta,
2016

Mots clefs: Electrodeposition Nanowires Tellurium Ionic liquid Hollow nanostructures

Resume: Abstract Template-free electrodeposition of Te one-dimensional (1 D) nanostructures was carried out from an ionic liquid binary mixture: 1-ethyl-1-octyl-piperidinium bis(trifluoromethylsulfonyl)imide:1-ethyl-1-octyl-piperidinium bromide (EOPipTFSI:EOPipBr 95:5 (mol%)). SAED and XRD analyses confirm the formation of Te 1D nanostructures with a hexagonal single crystalline structure following the [001] direction. A systematic study of the influence of synthesis parameters on the deposits morphology has shown that it is possible to control the shape and the dimensions of the deposited nanostructures. Specifically, the applied potential has a strong influence on the morphology of the deposits. Nanowires or hollow nanostructures can be obtained, depending on mass transport conditions, as confirmed by the use of a soluble anode.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

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