IMPROVEMENT OF CARBON SILICA SORBENT (CARBOSIL) SURFACE-PROPERTIES UPON STEAM ACTIVATION AT 1073-K

Results are presented concerning the changes in the surface structural parameters of carbon-silica sorbents (carbosils) prepared by thermal decomposition of dichloromethane on silica gel grains (Merck, silica g el grade 100) and their further activation with steam at 1073 K. The a ctivation process was accomplished in a thermogravimetric apparatus by partial gasification of the deposited carbon material on silica gel g rains to burn off 50% of the carbon content. The pore structure parame ters of the sorbents investigated were evaluated from their sorption b ehavior toward carbon dioxide and benzene molecules, determined at 298 K. It was shown that the activation process caused a two- to threefol d increase in the pore parameter values of the activation products, wh ich also resulted in their higher efficiency toward removal of halogen ated organic compounds from water solution.