Water influence on the surfactant adsorption on TiO2

The influence of water on the adsorption of long-chain aliphatic amine, alc ohol and carboxylic acid from toluene solutions on the surface of TiO2 (rut ile) was investigated. It was found that under wet adsorption conditions th e chemisorption of the acid is decreased, the chemisorption of the amine re mains the same as under anhydrous conditions and there is no chemisorption of the alcohol on TiO2. The mechanism of the surfactant adsorption and deso rption in the presence of water was studied using model systems with short- chain surfactant analogs and adsorption from vapors. (C) 1999 Elsevier Scie nce B.V. All rights reserved.