Surface charge and adsorption of background electrolyte ions at anatase/electrolyte interface

Abstract

Attempt of estimation of C 1 and C 2 capacities of the compact layer and distribution of potentials within the electrical double layer at the TiO 2(anatase)-electrolyte interface is presented in this paper taking into consideration the potentiometric titration, adsorption of swamping electrolyte ions, and electrokinetic data for this system. The ionization and complexation constants of surface groups are determined as well. The measurements were performed in LiCl, NaCl, KCI, CsCl, NaBr, and NaI solutions of different concentrations—from 0.001 to 0.1 M. The adsorption densities were determined by use of radiometric technique. New methods of surface ionization and complexation constants determination have been used. The limited applicability of the ionization-complexation model of the electrical double layer to the system studied has been ascertained.