On the anomalous behavior of alcohol adsorption on polymer-coated siliceous materials

Adsorption of alcohols on polymer-coated silica materials is considered. Th e data obtained show that the inner structure of the polymer layer determin es the adsorptive properties of the material. From the presented results it follows that the adsorption of polar alcohol molecules from nonpolar solve nt occurs in two steps of different kinetics. A simple model which explains large discrepancies between the adsorption and desorption heats is propose d. It is also demonstrated that the model allows us to explain the adsorpti on behavior of polar solutes from polar solvent. (C) 1999 Academic Press.