The investigation of the adsorptive behaviour of electroactive species by means of admittance analysis: Part II. Anion-induced adsorption of cadmium(II) from bromide and iodide solutions at the dropping mercury electrode |
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Authors: | E Fatás-Lahoz M Sluyters-Rehbach JH Sluyters |
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Institution: | Van''t Hoff Laboratory of Physical and Colloid Chemistry, Padualaan 8, 3584 CH Utrecht The Netherlands |
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Abstract: | The adsorption of Cd(II) has been studied by measuring the interfacial admittance spectra at different dc potentials of the dropping mercury electrode (DME) in solutions of: (a) 1 M KBr+0.48 mM Cd(NO3)2,(b) 1 M KI+0.105 mM CdI2 and (c) 0.1 M NaI+0.9 M NaClO4 +0.116 mM CdI2 The experimental data were analysed using the procedures described in Part I of this series. The frequency dependence of the admittance corresponds to that of a reversible electrode reaction with reactant adsorption. The potential dependence of the resulting adsorption parameters can be mathematically described by a Langmuir isotherm for adsorption of Cd(II) with the adsorption energy being at least a quadratic function of potential. Detailed checks on the consistency of this model have been applied and were found to be satisfactory. |
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Keywords: | To whom correspondence should be address |
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