Effect of hydrothermal treatment on the structure of water layers in carbosils suspensions

Carbon/silica samples prepared using mesoporous silica gel (SG, Si-60) modified by methylene chloride pyrolysis and then hydrothermal treatment using H2O2 as a modifier were studied by nitrogen adsorption, quasi-isothermal thermogravimetry and 1H NMR method. On the base of this method the concentration of strong (Cws) and weak (Cww) bound water, maximum decrease of Gibbs free energy of strongly and weakly bound water (ΔGs and ΔGw) as well as surface free energy of the adsorbent in the aqueous medium was determined. No distinct correlation was found between the characteristics of the water layers adsorbed on the carbosils surface and the carbon phase content. Hydrothermal treatment affects the interactions of adsorbent surface with the aqueous phase insignificantly.