Electrochemical behavior of Fe(CN) 3- 4-6 ions at H-, Na- and Ca-montmorillonite-modified Pt-electrodes incorporating methylene blue and neutral red cationic dyes, and cetyltrimethylammonium bromide (CTAB) cationic surfactant was investigated by cyclic voltammetry. The rate of the redox process was found to be mainly determined by the structure of the film of clay mineral particles. In the case of the Na-montmorillonite-modified electrode, the local pH effect and the mediated electron transfer must also be taken into account. Electrochemical investigations yielded additional information on the microstructure of montmorillonite films. The magnitude of the voltammetric peak currents for the Fe(CN) 3- 4-6 redox reaction depends on the permeability of the film affected by incorporated dye and surfactant ions.
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