【摘要】 以陶瓷纤维纸为基材,顺次经水玻璃、酸性硫酸氧钛溶液浸渍共沉淀制得新型蜂窝状陶瓷基钛掺杂硅胶块体吸附剂.FTIR谱在波数954cm-1附近的特征吸收峰表明钛掺杂硅胶中存在Si—O—Ti键;XRD谱显示掺杂材料为无定型非晶相材料;SEM显示钛掺杂硅胶粒子较好地分散在陶瓷纤维表面及其空隙中;用EDS及XPS揭示了材料的组成和钛原子含量,根据钛掺杂前后XPS中Si2p,O1s,Ti2p3/2电子结合能变化以及29SiMASNMR中硅原子化学位移差异,进一步表明钛原子替代硅原子进入了四面体骨架;BET分析显示掺杂材料以中孔为主.与硅胶相比,由于钛掺杂,其比表面积、孔容增大,吸附性能、耐热性能增强.更多还原

【Abstract】 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 aper- tures 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 in- ferred 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.更多还原