Studies of the mixed adsorption layer on a mercury electrode in the system p-toluidine-polyethyleneglycol-1 M NaClO4

摘要

The properties of the mixed adsorbption layer on a mercury electrode in the system 1 M NaClO4-p-toluidine-poryethyleneglycol (average molecular masses of polyethyleneglycols: 400 or 10000) are discussed. The parameters of the Frumkin and virial isotherms were determined in the range of strong adsorption potentials. In the range of more negative potentials, a mixed adsorption layer was found by investigating the kinetics of the reduction of Zn(II) ion as a pilot ion. Depending on the concentration ratio of the studied organic substances, inhibition, acceleration, or compensation of both with respect to Zn(II) electroreduction was observed. In the presence of polyethyleneglycol, the efficiency of the Zn(II)ion electroreduction increases due to a greater adsorption lability of p-toluidine molecules on the mercury surface.