ACETONE ADSORPTION ON HYDROXYLATED SILICA-GEL - CORRELATION OF SORPTION ISOTHERMS AND IR-SPECTRA

Results of adsorption and IR studies on the interaction of acetone wit h fully and partially hydroxylated surfaces of a KSS-3 silica gel are presented. Two plateaus on adsorption isotherms and two CO bands in IR absorption spectra are in close connection, which clearly indicates t wo adsorption complexes of acetone with different surface OH groups of silica. The weaker adsorption form (CO stretching vibration at 1705 c m(-1)) corresponds to the formation of an adsorption complex between a n acetone molecule and a terminal OH-group (OH stretching vibration at 3740 cm(-1)). An abnormally high fractal dimension of the silica gel surface has been obtained and discussed.