关键词: 钛掺杂硅胶, 浸渍, 吸附性能, 耐热性能

The novel honeycomb monolithic Ti-doped silica gel adsorbents based on ceramic fiber were prepared by treating ceramic fiber paper with impregnation-coprecipitation of water glass and acidic titanyl sulfate solution sequentially. In FTIR spectra, the peak at about 954 cm^－1 is the characteristic of Ti—O—Si linkage of the Ti-doped silica gel. XRD spectra show the amorphous structure of the novel adsorbents. SEM image reveals that the particles of Ti-doped silica gel are well scattered on the surface and in the apertures of the ceramic fiber paper. EDS and XPS analysis indicates the composition and the doped Ti content of the novel materials. According to the changes of Si2p, O1s, Ti2p 3/2 binding energy from XPS, as well as the difference of silica atom chemical shift from ²⁹Si MAS NMR before and after Ti-doping, it can be inferred that the titanium atoms insert into the silica gel framework. BET analysis shows that the mesopore is dominant for Ti-doped silica gel. The Ti-doping increases the specific surface area and pore volume, leading to greater adsorptive capacity and thermal stability of the novel monolithic adsorbents than that of silica gel.

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