Abstract
Surface complexation models of the electrical double layer at the metal oxide/electrolyte interface are used to describe behavior of such systems dependent on the background electrolyte concentration. When inert electrolyte concentration increases, it well known, that the surface charge increases while potential decreases. However, all of these models predict negligible adsorption of cations from solutions below pHpzc and anions above pHpzc. Numerous adsorption data show detectable adsorption of ions in these pH ranges. According to Johnson’s proposal (Johnson E. R. (1984) A Thermodynamic Description of the Double Layer Surrounding Hydrous Oxides J. Colloid Interface Sci. 100(2), 540–554) adsorption of ions on neutral sites can take place in addition to the reactions considered by standard complexation model. This adsorption is described by Frumkin isotherm which takes into account lateral interaction with charged groups and adsorbed ions.
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