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| In this paper, the cyclic voltammograms and thermodynamic properties of Eu(III), Sm(III), Dy(III) and Nd(III) in 1-butyl-3-methylimidazolium bromide ionic liquid were studied at GC working electrode in the temperature range of 298-373 K. The cyclic voltammograms of these lanthanide ions were composed of quasi-reversible waves and the current intensity increases with the temperature increased. At 373 K, the cathodic peak and anode peak potentials of Eu(III), Sm(III), Dy(III) and Nd(III) were -0.664 V, -0.511 V, -0.521 V, -0.508 V and -0.410 V, 0.293 V, 0.280 V, 0.269 V, respectively, while were due to the reduction of Ln(III) (Ln= Eu, Sm, Dy, Nd) to Ln(II) and the oxidation of Ln(II) to Ln(III). The diffusion coefficients, transfer coefficients and charge transfer rate constants of these trivalents were estimated. Moreover, the apparent standard potentials and some thermodynamic properties of the reduction of Ln(III) to Ln(II) were also investigated. |
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| Keywords:cyclic voltammetry; thermodynamic properties; diffusion coefficients; transfer coefficients; charge transfer rate constants |
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