NDLI: Effects of ultrasound and temperature on copper electro reduction in Deep Eutectic Solvents (DES).

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Effects of ultrasound and temperature on copper electro reduction in Deep Eutectic Solvents (DES).

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Effects of ultrasound and temperature on copper electro reduction in Deep Eutectic Solvents (DES).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mandroyan, Audrey Mourad-Mahmoud, Mahmoud Doche, Marie-Laure Hihn, Jean-Yves
Description	Country affiliation: France Author Affiliation: Mandroyan A ( Équipe Sonochimie et Réactivité des Surfaces, Institut UTINAM, UMR CNRS 6213, Université de Bourgogne Franche Comté (UFC), 25009 Besançon, France.); Mourad-Mahmoud M ( Équipe Sonochimie et Réactivité des Surfaces, Institut UTINAM, UMR CNRS 6213, Université de Bourgogne Franche Comté (UFC), 25009 Besançon, France.); Doche ML ( Équipe Sonochimie et Réactivité des Surfaces, Institut UTINAM, UMR CNRS 6213, Université de Bourgogne Franche Comté (UFC), 25009 Besançon, France.); Hihn JY ( Équipe Sonochimie et Réactivité des Surfaces, Institut UTINAM, UMR CNRS 6213, Université de Bourgogne Franche Comté (UFC), 25009 Besançon, France. Electronic address: jean-yves.hihn@univ-fcomte.fr.)
Abstract	This paper concerns a preliminary study for a new copper recovery process from ionic solvent. The aim of this work is to study the reduction of copper in Deep Eutectic Solvent (choline chloride-ethylene glycol) and to compare the influence of temperature and the ultrasound effects on kinetic parameters. Solutions were prepared by dissolution of chloride copper salt CuCl2 (to obtain Copper in oxidation degree II) or CuCl (to obtain Copper in oxidation degree I) and by leaching metallic copper directly in DES. The spectrophotometry UV-visible analysis of the leached solution showed that the copper soluble form obtained is at oxidation degree I (Copper I). Both cyclic voltammetry and linear voltammetry were performed in the three solutions at three temperatures (25, 50 and 80°C) and under ultrasonic conditions (F=20kHz, PT=5.8W) to calculate the mass transfer diffusion coefficient kD and the standard rate coefficient k°. These parameters are used to determine that copper reduction is carried out via a mixed kinetic-diffusion control process. Temperature and ultrasound have the same effect on mass transfer for reduction of Cu(II)/Cu(I). On the other hand, temperature is more beneficial than ultrasound for mass transfer of Cu(I)/Cu. Standard rate constant improvement due to temperature increase is of the same order as that obtained with ultrasound. But, by combining higher temperature and ultrasound (F=20kHz, PT=5.6W at 50°C), reduction limiting current is increased by a factor of 10 compared to initial conditions (T=25°C, silent), because ultrasonic stirring is more efficient in lower viscosity fluid. These values can be considered as key-parameters in the design of copper recovery in global processes using ultrasound.
File Format	HTM / HTML
ISSN	13504177
Issue Number	6
Journal	Ultrasonics Sonochemistry
Volume Number	21
e-ISSN	18732828
Language	English
Publisher	Elsevier
Publisher Date	2014-11-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Diagnostic Imaging
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Environmental Chemistry Acoustics and Ultrasonics Radiology, Nuclear Medicine and Imaging Chemical Engineering Inorganic Chemistry

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