纳米TiO_2光催化剂防团聚的光谱研究

Spectrum Study on the Agglomeration-prevention of the Nanosized Titania Photocatalyst

本文用溶胶 凝胶过程超临界CO2 萃取制备纳米二氧化钛气凝胶 ,用FT Raman ,FTIR ,FS分别对初生态气凝胶粒子、在常态下以气凝胶形式保存了 36 0天的TiO2 纳米粒子及以初生态气凝胶的粉体保存了36 0天的TiO2 粒子进行表征 ,以光催化降解甲基橙为模型反应 ,结果表明 ,在常态下以气凝胶形式保存纳米TiO2 粒子能有效地防止由纳米TiO2 表面超亲水性引起粒子间的团聚 ,保持了初生态粒子的光催化活性。

In this paper, nanocrystal titania aerogel was prepared through sol-gel extracted by supercritical carbon dioxide, and three different nanosized particles, newly born aerogel particle, titania particles preserved in the form of aerogel for one year and preserved in the form of newly born aerogel powder particle for one year, were characterized by FT-Raman, FTIR, and FS. The degradation of methyl orange by photocatalysis is regarded as a model reaction, and the result indicates that the particles preserved in the form of aerogel can prevent the agglomeration of super-hydrophility of TiO2 surface very well and maintain photocatalystic activity of the newly born particles.