Anodic dissolution of metals in ionic liquids

Abbott, Andrew P.; Frisch, Gero; Hartley, Jennifer M.; Karim, Wrya O.; Ryder, Karl S.

doi:10.1016/j.pnsc.2015.11.005

Cited by 115 publications

(88 citation statements)

References 35 publications

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“…9 are likely to contain glycolates as ligands. 36 If the carbon and oxygen only came from the glycolate ligand, it would be expected that the C : O ratio would be 1. In all cases the C : O ratio is <1 meaning that some iron oxide must also be present.…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

et al. 2017

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a Processing sulfur containing minerals is one of the biggest sources of acute anthropogenic pollution particularly in the form of acid mine drainage. This study attempts to show an innovative method for processing sulfide-based minerals. It is shown that pyrite can be solubilised by both electrochemical oxidation and reduction in a deep eutectic solvent (DES) Ethaline, a mixture of choline chloride and ethylene glycol.A novel method is demonstrated to investigate the redox properties of minerals using a paste made from the mineral powder in a DES. The first bulk electrochemical dissolution of pyrite is shown without the formation of H 2 S or SO 2 . It is also shown that the soluble species, including elements such as arsenic, can be recovered electrochemically which could potentially decrease acid mine drainage. The electrochemical properties of other iron-sulfur and iron-arsenic minerals are also presented and compared to those of pyrite.

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Section: Uv-vis Spectroscopymentioning

confidence: 99%

Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

et al. 2017

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“…Despite such concerns, studies of the anodic behaviour of metals in deep eutectic solvents are relatively rare, but a recent paper by Ryder and co-workers 21 has examined the dissolution of several metals in pure ethaline and an imidazolium RTIL. For stationary copper electrodes at low applied potentials, active dissolution of copper was observed and it was suggested that this arose from the formation of CuCl 2 -species.…”

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confidence: 99%

Anodic Reactions and the Corrosion of Copper in Deep Eutectic Solvents

Green

Valverde

Roy

2018

J. Electrochem. Soc.

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An analysis of the anodic reaction occurring at soluble copper anodes during the electrodeposition of copper from an ethaline-based deep eutectic solvent (DES) has been performed. It was shown by UV-Vis spectroscopy and electrochemical measurements that the dominant anodic species produced is the CuCl 2 -complex. In pure ethaline the current efficiency of the anodic process is 100% and the dissolution valency is one. However, in the presence of Cu(II) species the apparent dissolution valency measured gravimetrically was typically less than unity, corresponding to an observed mass loss greater than that expected from Faraday's law.Moreover, the apparent dissolution valency showed a marked dependence on the electrode

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“…This window is usually far larger than 2 V, which makes it possible to perform anodic dissolution and electrodeposition of various metals with a limited ionic liquid degradation [8,23,24]. ILs appear promising for the recovery of hardly reducible metals [9,25,26], or noble metals of troublesome oxidation [27][28][29][30]. Moreover, ILs composed of coordinating anions (such as Cl − , Br − , SCN − , N(CN) 2 − .…”

Section: Direct Electroleaching/electrodeposition Of Platinum In Ionimentioning

confidence: 99%

Recovery of Metals from Secondary Raw Materials by Coupled Electroleaching and Electrodeposition in Aqueous or Ionic Liquid Media

Leclerc

Legeai

Balva

et al. 2018

Metals

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This paper presents recent views on a hybrid process for beneficiation of secondary raw materials by combined electroleaching of targeted metals and electrodeposition. On the basis of several case studies with aqueous solutions or in ionic liquid media, the paper describes the potential and the limits of the novel, hybrid technique, together with the methodology employed, combining determination of speciation, physical chemistry, electrochemistry, and chemical engineering. On one hand, the case of electroleaching/electrodeposition (E/E) process in aqueous media, although often investigated at the bench scale, appears nevertheless relatively mature, because of the developed methodology, and the appreciable current density allowed, and so it can be used to successfully treat electrode materials of spent Zn/MnO 2 batteries or Ni/Cd accumulators and Waelz oxide. On the other hand, the use of ionic liquids as promising media for the recovery of various metals can be considered for other types of wastes, as shown here for the case of electrodes of aged fuel cells. The combined (E/E) technique could be successfully used for the above waste, in particular by the tricky selection of ionic liquid media. Nevertheless, further investigations in physical chemistry and chemical engineering appear necessary for possible developments of larger-scale processes for the recovery of these strategic resources.

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Anodic dissolution of metals in ionic liquids

Cited by 115 publications

References 35 publications

Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

Dissolution of pyrite and other Fe–S–As minerals using deep eutectic solvents

Anodic Reactions and the Corrosion of Copper in Deep Eutectic Solvents

Recovery of Metals from Secondary Raw Materials by Coupled Electroleaching and Electrodeposition in Aqueous or Ionic Liquid Media

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