Feasibility studies on electrochemical recovery of uranium from solid wastes contaminated with uranium using 1-butyl-3-methylimidazorium chloride as an electrolyte

Ohashi, Yusuke; Harada, Masayuki; Asanuma, Noriko; Ikeda, Yasuhisa

doi:10.1016/j.jnucmat.2015.04.024

Cited by 19 publications

(3 citation statements)

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“…ii) as a possible alternative to high temperature molten salts (e.g. LiClKCl) in nonaqueous-based pyrochemical reprocessing [9][10][11][12][13][14][15][16][17][18][19]. In this way, the substitution of unsymmetrical organic cation in place of alkali metal cation of the inorganic salts, drastically reduces the melting point of the resulting organic chloride to near ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…From these backgrounds, various ILs having a wide electrochemical window, adequate thermal and radiation stability, and ability to dissolve organic and inorganic compounds has been proposed, being between them the 1-butyl-3-methyl imidazolium chloride (C 4 mimCl) [11,[13][14][15][16][17]20] and the 1-ethyl-3-methyl imidazolium chloride (C 2 mimCl) [19]. In order to evaluate the applicability of ILs, as alternative media to the conventional molten salts in the pyroreprocessing process, the knowledge of the electrochemical behaviour of actinides (Ans) and fission products (FPs), mainly lanthanides (Lns), is a major concern.…”

Section: Introductionmentioning

confidence: 99%

“…In order to evaluate the applicability of ILs, as alternative media to the conventional molten salts in the pyroreprocessing process, the knowledge of the electrochemical behaviour of actinides (Ans) and fission products (FPs), mainly lanthanides (Lns), is a major concern. Nevertheless, the reported information in C 4 mimCl and C 2 mimCl is scarce, ambiguous and conflicting [13][14][15][16][17]19].…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of the cathodic behaviour of EuCl3 in two imidazolium chloride ionic liquids, the 1-butyl-3-methylimidazolium (C4mimCl) and the 1-ethyl-3-methylimidazolium (C2mimCl), on a glassy carbon electrode

Barrado

Rodríguez

Castrillejo

2017

Journal of Electroanalytical Chemistry

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A B S T R A C TThis work presents a comparative study of the electrochemical behaviour, on a glassy carbon electrode, of dissolved EuCl 3 in two chlorobasic ionic liquids, the 1-ethyl-3-methylimidazolium chloride, C 2 mimCl, and the 1-buthyl-3-methylimidazolium chloride, C 4 mimCl, over the temperature ranges 363-398 K and 343-363 K respectively. In both media, the electro-reduction of EuCl 6 3 − takes place via only one electrochemical step . The electrochemical system EuCl 6 4 − /Eu(0) has not been observed within the electrochemical window of both ILs, due to the prior reduction of the respective imidazolium cation from the solvents, which inhibits the electro-extraction of Eu (0) from the media on the GC electrode. The paper describes how several electrochemical techniques (e.g. cyclic voltammetry (CV), convolutive potential sweep voltammetry (CPSV), steady state voltammetry (SSV), chronopotentiometry (CP) and chronoamperometry (CA)) have been used experimentally: i) verifying assumptions used in their theoretical analysis, and ii) ensuring reproducible conditions at the electrode/electrolyte interface, with the aim to obtain highprecision measurements of the diffusion coefficient of EuCl 6 3 − . In order to know if there are discrepancies between the obtained data, a two-way analysis of variance, ANOVA, has been carried out. The analysis has shown that with a 95% confidence level there are no significant differences between the diffusion coefficients obtained by the different techniques. On the other hand, the diffusion coefficient of EuCl 6 3 − increases with the temperature following the Arrhenius law, being the activation energy for diffusion 40.4 ± 2.6 and 60.2 ± 1.8 kJ mol − 1 in C 2 mimCl and C 4 mimCl respectively. The dimensionless Schmidt numbers, defined as the ratio between solvent viscosity and solute diffusivity (Sc = ν/D), have also been calculated to characterise the solute global mass transport through its environment. On the GC electrode, the electro-reduction of EuCl 6 3 − to EuCl 6 4 − is a quasi-reversible process. Accurate values of the kinetic parameters (i.e. the intrinsic rate constant of charge transfer, k 0 , and the charge transfer coefficient, α), as well as the reversible half wave potential, E r 1/2 , have been obtained for the first time in the mentioned ionic liquids, by simulation of the cyclic voltammograms and logarithmic analysis of the voltammograms and convoluted curves.

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