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365 results on '"Pellet-Rostaing, Stéphane"'

22. Electrochemical and Spectroscopic Study of Eu(III)/Eu(II) Couple in the 1-Ethyl-3-Methylimidazolium Bis(Trifluromethanesulfonyl)Imide Ionic Liquid

Author

Bengio, David, Dumas, Thomas, Mendes, Eric, Solari, Pier-Lorenzo, Husar, Richard, Schlegel, Michel, Moisy, Philippe, Pellet-Rostaing, Stéphane, Kim, Hojong, editor, Wesstrom, Bradford, editor, Alam, Shafiq, editor, Ouchi, Takanari, editor, Azimi, Gisele, editor, Neelameggham, Neale R., editor, Wang, Shijie, editor, and Guan, Xiaofei, editor

Published
2018
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30. Exploring the Aggregation Behavior of Extractant Molecules in Ionic Liquids: A Coupled Polarizable Molecular Dynamics and SAXS Study

Author

Le Crom, Sébastien, Dourdain, Sandrine, Pellet-Rostaing, Stéphane, Duvail, Magali, Modélisation Mésoscopique et Chimie Théorique (LMCT), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), Tri ionique par les Systèmes Moléculaires auto-assemblés (LTSM), and ANR-16-IDEX-0006,MUSE,MUSE(2016)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
Abstract

International audience; This study presents a comprehensive investigation of the aggregation behavior of a malonamide extractant molecule (N,N′-dimethyl,N,N′-dioctylhexylethoxymalonamide (DMDOHEMA)) in three different solvents, including two piperidinium- and (trifluoromethylsulfonyl)imide-based ionic liquids (1-ethyl-1-butylpiperidinium bis(trifluoromethylsulfonyl)imide ([EBPip+][NTf2–]) and 1-ethyl-1-octylpiperidinium bis(trifluoromethylsulfonyl)imide ([EOPip+][NTf2–])) and n-dodecane. By combining polarizable molecular dynamics simulations and small-angle X-ray scattering experiments, we extensively investigated the arrangement of supramolecular assemblies of the extractant molecules. Our results showed that the insertion of the alkyl chains of the extractant molecules into the apolar domain of [EOPip+][NTf2–] has a significant impact on the aggregation behavior of the extractant molecules, leading to the formation of smaller aggregates having a higher dispersion compared to other solvents. These findings provide new insights into the physicochemical properties of this type of system and are crucial in designing more effective solvents for rare earth metal extraction.

Published
2023
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32. Hydrophobic Porous Liquids with Controlled Cavity Size and Physico‐Chemical Properties.

Author

Ginot, Lorianne, El Bakkouche, Amal, Giusti, Fabrice, Dourdain, Sandrine, and Pellet‐Rostaing, Stéphane

Subjects
ETHYLENE oxide, LIQUIDS, LIQUID-liquid extraction, PHASE separation, MOLECULAR weights, HYDROPHOBIC compounds
Abstract

Developing greener hydrometallurgical processes implies offering alternatives to conventional solvents used for liquid‐liquid extraction (LLE) of metals. In this context, it is proposed to substitute the organic phase by a hydrophobic silica‐based porous liquid (PL). Two different sulfonated hollow silica particles (HSPs) are modified with various polyethoxylated fatty amines (EthAs) forming a canopy that provides both the targeted hydrophobicity and liquefying properties. This study shows that these properties can be tuned by varying the number of ethylene oxide units in the EthA: middle‐range molecular weight EthAs allow obtaining a liquid at room temperature, while too short or too long EthA leads to solid particles. Viscosity is also impacted by the density and size of the silica spheres: less viscous PLs are obtained with small low‐density spheres, while for larger spheres (c.a. 200 nm) the density has a less significant impact on viscosity. According to this approach, hydrophobic PLs are successfully synthesized. When contacted with an aqueous phase, the most hydrophobic PLs obtained allow a subsequent phase separation. Preliminary extraction tests on three rare earth elements have further shown that functionalization of the PL is necessary to observe metal extraction. [ABSTRACT FROM AUTHOR]

Published
2024
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46. New Carbamoyl Surface-Modified ZrO 2 Nanohybrids for Selective Au Extraction from E-Waste.

Author

Asaad, Sarah, Hamandi, Marwa, Arrachart, Guilhem, Pellet-Rostaing, Stéphane, Kimbel, Serge, and Daniele, Stéphane

Subjects
LANGMUIR isotherms, ELECTRONIC waste, PHOSPHONIC acids, ZIRCONIUM oxide, ETHANOL, ADSORPTION capacity, PRECIOUS metals
Abstract

Efficient and selective extractions of precious and critical metal ions such as Au(III) and Pd(II) were investigated using zirconia nanoparticles surface modified with different organic mono- and di-carbamoyl phosphonic acid ligands. The modification is made on the surface of commercial ZrO2 that is dispersed in aqueous suspension and was achieved by optimizing the Bronsted acid–base reaction in ethanol/H2O solution (1:2), resulting in inorganic–organic systems of ZrO2-Ln (Ln: organic carbamoyl phosphonic acid ligand). The presence, binding, amount, and stability of the organic ligand on the surface of zirconia nanoparticles were confirmed by different characterizations such as TGA, BET, ATR-FTIR, and 31P-NMR. Characterizations showed that all the prepared modified zirconia had a similar specific surface area (50 m2.g−1) and the same amount of ligand on the zirconia surface in a 1:50 molar ratio. ATR-FTIR and 31P-NMR data were used to elucidate the most favorable binding mode. Batch adsorption results showed that (i) ZrO2 surface modified with di-carbamoyl phosphonic acid ligands had the highest adsorption efficiency to extract metals than mono-carbamoyl ligands, and (ii) higher hydrophobicity of the ligand led to better adsorption efficiency. The surface-modified ZrO2 with di-N,N-butyl carbamoyl pentyl phosphonic acid ligand (ZrO2-L6) showed promising stability, efficiency, and reusability in industrial applications for selective gold recovery. In terms of thermodynamic and kinetic adsorption data, ZrO2-L6 fits the Langmuir adsorption model and pseudo-second-order kinetic model for the adsorption of Au(III) with maximum experimental adsorption capacity qmax = 6.4 mg.g−1. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Surface modification of nano-ZrO2 for adsorption of palladium and gold.

Author

Trieu, Quoc-An, Bui, Trung Huu, Arachart, Guilhem, Pellet-Rostaing, Stéphane, and Daniele, Stéphane

Subjects
LANGMUIR isotherms, ATTENUATED total reflectance, FOURIER transform infrared spectroscopy, ADSORPTION kinetics, LIPOIC acid, LEAD removal (Sewage purification)
Abstract

Management and recycling of e-waste closely relate to many sustainable development goals, including decent work & economic growth, good health & well-being, clean water & sanitation, and life below water. Hydrometallurgical techniques, particularly adsorption processes, have drawn significant attention due to their capabilities to recover trace amounts of noble metals in the effluents from recycling plants. In this study, the synthesis of surface-modified ZrO2 nano- hybrids to capture efficiently and selectively Au(III) and Pd(II) ions was investigated. The resultant materials including thioctic acid (TOA), dioctyldiglycoamide (DODGA), (N, N)-bis(2-ethylhexyl)carbamoylmethylphosphonic acid (DEHCMPA), (N,N)-dioctylcarbamoylmethylphosphonic acid (DOCMPA), phosphonomethylimino diacetic acid (PMIDAA) surface-modified nano-ZrO2 were extensively characterized using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR). The results showed that the thioctic acid-modified nano-ZrO2 (ZrO2−TOA) exhibited superior adsorption properties toward both Pd(II) and Au(III) among the nano-hybrid adsorbents. The adsorption data of ZrO2−TOA toward Pd(II) and Au(III) were well fitted to the nonlinear Langmuir adsorption model. The adsorption kinetics of ZrO2−TOA was described by the nonlinear pseudo-second model in which chemical interaction between active sites of materials and targeted metal ions is the rate-limiting step. The TOA-modified nano-ZrO2 has demonstrated promising adsorption capabilities in the recovery of Pd and Au from industrial effluents. [ABSTRACT FROM AUTHOR]

Published
2022
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