化学学报 ›› 2006, Vol. 64 ›› Issue (6): 515-520. 上一篇    下一篇

研究论文

陶瓷基钛掺杂硅胶块体吸附剂研究

方玉堂*,易立群,刘艳山,高学农   

  1. (1华南理工大学传热强化与过程节能教育部重点实验室 广州 510640)
    (2南方医科大学化学系 广州 510515)
  • 投稿日期:2005-01-25 修回日期:2005-12-07 发布日期:2006-03-28
  • 通讯作者: 方玉堂

Study on Monolithic Ti-Doped Silica Gel Adsorbent Based on Ceramic Fiber

FANG Yu-Tang*, YI Li-Qun, LIU Yan-Shan, GAO Xue-Nong   

  1. (1 The Key Laboratory of Enhanced Heat Transfer & Energy Conservation, Ministry of Education of China, South China
    University of Technology, Guangzhou 510640)
    (2 Department of Chemistry, Southern Medical University, Guangzhou 510515)
  • Received:2005-01-25 Revised:2005-12-07 Published:2006-03-28
  • Contact: FANG Yu-Tang

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954 cm-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, Ti2p 3/2电子结合能变化以及29Si MAS NMR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.

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