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

The adsorption behaviour of aliphatic carboxylic acids (ACA), amines (AAM), ketones (AK) and esters (AE) on the polycrystalline Bi \ electrolyte solut ion interface has been studied by the differential capacity-electrode poten tial measurement method. The values of the limiting Gibbs adsorption, inter action constant a(0) in the Frumkin isotherm, zero charge potential shift D elta E-sigma=0 due to the organic compound adsorption and other adsorption parameters have been obtained and compared with the corresponding values fo r linear aliphatic alcohols (AA). The dependence of Delta E-sigma=0 on the surface coverage theta has been discussed with the aid of Nikitas et al. mo del. The shape of the Delta E-sigma=0(-1), theta(-1)-plot depends on the hy drocarbon chain structure, a well as on the chemical nature of the function al group of organic compound studied. (C) 1999 Elsevier Science Ltd. All ri ghts reserved.