Abstract:

Novel Ti-doped silica gel adsorptive materials were prepared by treating ceramic fiber paper with the sequential impregnation of water glass and the aqueous solution of acidic titanium salt.The optimal reaction conditions were accordingly obtained,that is,30% (mass fraction)of the titanium salt content,1 mol/L of the additional sulfutic acid concentration,80℃of the impregn ation temperature and 120 min of the impregnation time.It is found that the characteristic peak of Ti- O-Si linkage in the Ti-doped silica gel is shown on the FTIR spectra at the wavenum-ber of 954 cm^-1.Th e SEM photograph reveals that the Ti-doped silica gel well scatters on the surface and in the apertures
of the ceramic fiber paper;an d the porous medium surface area an alysis shows that the mesopore is dominant in the Ti-doped silica gel.Th e present study also presents an X-ray EDS analysis of the existence and content of Ti⁴⁺ in the adsorptive materials.It is concluded that,compared with the original silica gel,the Ti-doped silica gel is of greater
specific surface area,pore volume and adsorptive capacity.and possesses stronger thermal stability because of the formation of Ti- O- Si linkage on the surface.

Key words: Ti-doped silica gel, preparation, impregnation, adsorptive capacity, thermal stability