Turkish Journal of Chemistry




The mixed adsorption layers of tetramethylthiourea and a neutral detergent formed at the electrode surface in 1 M NaClO_4 are described in this paper. The systems were characterized by the measurement of differential capacity, zero charge potential, and surface tension at the same potential. The data were analyzed to obtain the surface pressure and relative surface excess of tetramethylthiourea as a function of electrode charge and bulk concentration of the studied compounds. The values of the lateral interaction parameters, obtained in the presence and in the absence of decanoyl-N-methylglucamide (C_{17}H_{35}NO_6), change differently depending on the isotherm used, but \Delta G° values were clearly smaller in the presence of C_{17}H_{35}NO_6. Electrostatic parameters of the inner layer were assigned. A compensation for the inhibition and accelerating effect was obtained for the bulk concentrations ratio c_{TMTU}:c_{detergent} \approx 13.3. For c_{TMTU} > 0.01 M the acceleration of Zn^{2+} electroreduction appeared.


Adsorption isotherms, cyclic voltammetry, neutral detergent, standard rate constants

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