The zero charge potential shift upon adsorption of various organic compounds at bismuth │ solution interface

摘要

The adsorption behaviour of aliphatic carboxylic acids (ACA), amines (AAM), ketones (AK) and esters (AE) on the polycrystalline Bi│electrolyte solution interface has been studied by the differential capacity-electrode potential measurement method. The values of the limiting Gibbs adsorption, interaction constant a{sub}0 in the Frumkin isotherm, zero charge potential shift △E{sub}(σ=0) due to the organic compound adsorption and other adsorption parameters have been obtained and compared with the corresponding values for linear aliphatic alcohols (AA). The dependence of △E{sub}(σ=0) on the surface coverage θ has been discussed with the aid of Nikitas et al. model. The shape of the △E{sub}(σ=0){sup}(-1), θ{sup}(-1)-plot depends on the hydrocarbon chain structure, as well as on the chemical nature of the functional group of organic compound studied.