Electrosurface Characteristics of (Hydr)oxides and Oxide Nanostructures in 1 : 1 Electrolyte Solutions. 3. Calculation of the Electrical Double Layer Parameters for Boehmite, Goethite, and Silicon Oxide According to Adsorption and Electrokinetic Data

Abstract

The charge components, potentials, and capacities of the electrical double layer are calculated for aluminum, iron, and silicon (hydr)oxides on the basis of adsorption and electrokinetic measurements conducted in NaCl and KCl solutions. The dissociation degrees of surface groups in the point of zero charge and in the isoelectric point are estimated on the basis of the surface reaction constants. The 2-pK model in combination with the Graham model is shown to be applicable for describing the experimental results obtained for the systems in question.