Abstract
The influence of pretreatment of TiO 2 in oxidizing or reducing atmospheres on surface charge, charge behind the electrokinetic slipping plane, and stability toward coagulation has been investigated. No influence was found on pure TiO 2, which does not show any specific adsorption of K +, Cl −, or NO 3 − ions. Impurities in the TiO 2, however, lead to effects suggesting specific adsorption of anions (SO 4 2−). Pretreatment of impure TiO 2 under reducing conditions enhances this effect (reduction of SO 4 2− to S 2−, which is strongly specifically adsorbed). However, the effect is compensated behind the electrokinetic slipping plane by additional adsorption of anions or desorption of cations.
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