The surface properties of activated carbon and the surface-treated ones with organochlorosilanes, alcohols and phenylhydrazine were investigated by means of X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, dispersive property and pyrolysis. The followings were recognized : (1) The surface of activated carbon was covered by the functional groups which contained oxygen ; (2) From the results of FTIR spectra the surface of activated carbon was perceived to be surface-treated by chlorosilanes and alcohols ; (3) The change of surface property from hydrophylic to hydrophobic by the surface-treatment was not remarkable except that silanes polymerized on the surface, therefore the surface hydroxyl group was considered to be minor ; (4) Because of the existence of surface group which reacted with phenylhydrazine, carbonyl group was the component of the surface groups ; (5) Pyrolytic properties indicated that the surface groups converted by the surface treatment were_??_COR, _??_COSi (OH)
2R or _??_COSiR
3 formed by the reactions of dehydrochlorination and dehydration between surface hydroxyl group and chlorosilanes and alcohols.
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