| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Legeai, Sophie
Université de Lorraine
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024Propylene glycol-based deep eutectic solvent as an alternative to Ethaline for electrometallurgycitations
- 2024Propeline: a green alternative to Ethaline for electrometallurgy of precious metals ? ; Propeline: a green alternative to Ethaline for electrometallurgy of precious metals ?: The economical viability of WEEE (Waste from Electrical and Electronic Equipment) recycling is mainly based on the recovery of copper and precious metals. In this context, we aim at developing a green process for the recovery of silver, palladium, and gold from rich printed-circuit boards (cell phones, labtops…). The recovery will be conducted after the necessary stages of non-metallic materials removal and the beneficiation of less precious metals such as copper and nickel, carried out by Terra Nova Development (TND), our industrial partner.The process envisaged is based on electrometallurgy in “Deep eutectic solvents” (DES), a technology that can be considered as green alternative to conventional hydrometallurgy for precious metals recovery. Indeed, DES have a low reactivity and volatility, making them far less noxious to environment than corrosive liquors employed in conventional processes (cyanides, aqua regia). In particular, the DES named Ethaline (choline chloride-ethylene glycol mixture) has been widely used in electrometallurgy, because of its acceptable viscosity and the presence of substantial Cl- concentration leading to a high solubility of numerous metallic compounds. However, if choline chloride (ChCl) can be considered as a “green” reactant, ethylene glycol (EG) is known to be harmful to men and animals in case of repeated exposure or inhalation periods. Comparable DES with a lower toxic nature than Ethaline can be obtained by replacing EG by other glycols e.g. propylene glycol (PG), widely used in cosmetics and pharmacology, with costs comparable to those of EG: The resulting DES is named Propeline. We will present the potential of this less known DES in the recovery of precious metals. Because the change in the hydrogen bond donor with PG leads to a modification of the DES bulk properties, the first part of this work deals with the determination of Propeline density, viscosity, conductivity and electrochemical stability, which are properties of interest for electrochemical processes. The influence of water content on these properties was thoroughly investigated. Values of the above property parameters are compared to those obtained with Ethaline as a reference DES. In a second part, we will present the performances of Propeline for the electrochemical leaching of Ag, Pd and Au. The performance of Propeline in leaching was evaluated in ambient atmosphere, i.e. in the presence of water at percent levels. Leaching efficiencies could be studied after thorough development of analytical procedures dedicated to elemental analysis e.g. ICP-EOS in DES. The speciation of leached metals was determined by use of cross-linked analysis, namely UV-vis, and EXAFS/XANES spectroscopic techniques, in both cases with comparison with those in Ethaline. Systems (leached metal species-DES) were then thoroughly studied by electrochemical methods. In particular, diffusion coefficients of the solvated metal species were determined by electrochemical transient and stationary techniques, in the aim of leached metal recovery by electrochemical deposition.
- 2024Electroleaching and electrodeposition of silver in ethaline 1 : 2 and propeline 1 : 3: transport properties and electrode phenomena†
- 2023Propeline: a green alternative to Ethaline for electrochemical recovery of precious metals
- 2023Propeline : a new candidate for precious metal recovery 3rd International Meeting on Deep Eutectic Systems, Lisbonne, 19-22 juin 2023
- 2022Coupling electrochemical leaching and electrodeposition in ionic solvents for critical and precious metals recovery
- 2021Mass transport in Ionic Solvents during electrodeposition of gold and palladium
- 2021Electrochemical recovery of precious metals in Ionic Liquid mixtures or Deep Eutectic Solvents
- 2018Recovery of Metals from Secondary Raw Materials by Coupled Electroleaching and Electrodeposition in Aqueous or Ionic Liquid Mediacitations
- 2018Recycling of WEEE ...... we do not stop progress!
- 2017Electrochemical recovery of platinum from spent proton exchange membrane fuel cells using ionic liquid melts
- 2016Tuning the morphology of Te 1D nanostructures by template-free electrochemical deposition in an ionic liquid
- 2015Electrosynthesis of self-standing single crystalline Te nanostructures in an ionic liquid
- 2014Indium recovery by coupling liquid-liquid extraction and electrodeposition in ionic liquids
- 2014Electrodeposition of stoichiometric bismuth telluride Bi2Te3 using a piperidinium ionic liquid binary mixturecitations
- 2012Auto-supported Te nanowires synthesis by template-free electrodeposition from a piperidinium ionic liquid
- 2012Template-free electrodeposition of Te nanowires in a piperidinium-based ionic liquid
- 2011New insight into indium electrochemistry in a Tf2N-based room-temperature ionic liquidcitations
- 2006A copper bismuth film electrode for adsorptive cathodic stripping analysis of trace nickel using square wave voltammetrycitations
- 2005Economic bismuth-film microsensor for anodic stripping analysis of trace heavy metals using differential pulse voltammetry.citations
Places of action
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conferencepaper
Tuning the morphology of Te 1D nanostructures by template-free electrochemical deposition in an ionic liquid
Abstract
Tellurium and its alloys are used in many applications such as photoconductors, piezoelectric devices, thermoelectric generators and coolers [1]. For thermoelectric applications, the transport properties (thermal conductivity, electrical resistivity, Seebeck coefficient) of tellurium and its compounds can be improved by nanostructuring [2]. One-dimensional nanostructures like nanowires [3] and core-shell nanowires [4] are particularly promising due to the high phonon interface scattering and the blocking of the phonon conduction along the wire axis which lead to an increase of the thermoelectric conversion efficiency. Te nanowires can represent a base to create core-shell structures, being the core that could be further capped with a shell to get arrays of Te-based thermoelectric nanostructures like BiTe [5], AgTe [6] or LaTe [7].Template assisted electrodeposition is a low cost technique widely used in literature for the synthesis of nanowires but implies several preparation steps and the removal of the template after the growth of the nanowires. The aim of this work is to develop a template free synthesis route that would be more convenient. For this purpose, Room-Temperature Ionic Liquids (RTILs) appear as promising solvents. Indeed, it has been highlighted that they can act as stabilizing agents for nanoparticles and nanostructured films synthesis [8]. In a previous work ([9]), our laboratory showed that Te nanowires can be obtained in an ionic liquid binary mixture: 1-ethyl-1-octyl-piperidinium bis(trifluoromethylsulfonyl)imide:1-ethyl-1-octyl-piperidinium bromide (EOPipTFSI:EOPipBr).In the present work, several morphologies were obtained by varying the synthesis parameters (applied fixed potential, Te(IV) concentration, electrolyte composition). Under charge transfer control, micrometer faceted grains are formed. Under diffusion control, the deposits are composed of nanowires, which are single crystalline as proven by SAED (Selected Area Electronic Diffraction) and TEM (Transmission Electron Microscopy) analyses.In highest tested overpotential conditions, nanowires turn progressively into crystallized hollow nanostructures (HNs) when the coulometric charge increases. This phenomenon is more accentuated at low concentration and disappears when using a soluble anode, showing that the formation of HNs is due to a limitation by species supply. The geometry of HNs, with a high surface to volume ratio, is particularly interesting to create high performances thermoelectric materials. Indeed, this geometry could further decrease the lattice part of the thermal diffusion coefficient by phonon confinement.