Abstract: The specific surface area, specific pore volume and the average pore radius of the silanized active carbon were determined.The wetting and adsorption properties of the same active carbon were studied.The results indicate.(1) with the lapse of the time of the reaction between the active carbon and ClSi(CH₃)₃ vapor, the specific surface area and specific pore volume decrease greatly, but the average pore radius and pore size distribution are nearly unchanged; (2) the hydrophobicity of the silanized active carbon is stronger than that of the original carbon; (3) the adsorption of butanol from water onto the active carbon increases with the silanization.The above-mentioned results can be explained by the surface reaction between the surface oxygenated groups of the active carbon and the ClSi(CH₃)₃ vapor.

Key words: Active carbon, Surface modification, Wetting, Adsorption