Coadsorption of orgaqic molecules on mercury electrode

Abstract

Coadsorption of <i>o</i>-hydroxybenzoic aci with o-methoxybenzoic acid and/or o-aminobenzoic acid at the mercury/0.1 <i>M</i> Na₂SO₄ solution interf ce has been studied using a capillary electrometer. Thermodynamic parameters, such as surface charge density (q^M), surface excess of the organic molecule adsorbed (Г_org) and coverage (<i>θ</i>) have been evaluate. It is observed from the adsorption data that coadsorption takes place by the partial replacement of ready adsorbed organic compound on the metal surface and the adsorption of both the compounds is found to take place over a wide range of potentials.