Titanium dioxide–electrolyte interface. Part 2.—Surface charge (titration) studies

Abstract

Surface charge–pH isotherms for TiO₂ in K⁺, Li⁺, Mg²⁺ and tetramethylammonium electrolyte solutions are reported for a TiO₂ colloid sample shown previously to be essentially holocrystalline and non-porous. The charge data are similar to other oxides with the exception of precipitated silica. The adsorption sequence obtained is Mg²⁺ Li⁺ > K⁺≃(CH₃)₄N⁺.