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将硫酸钛浸渍到SBA-15孔道中,经升温原位沉淀、焙烧得到纳米孔道中均匀分散的锐钛矿相TiO2.用TEM,BET,XRD,SAXD,Raman,UV-Vis漫反射吸收光谱,XPS,XRF等方法对材料进行了表征.表征结果表明,改性后的SBA-15仍保持着有序的孔道,TiO2颗粒较均匀地分布在SBA-15孔道内部,SBA-15孔道合适的纳米尺寸对TiO2颗粒的长大起到较好的限制作用,从拉曼光谱和XPS数据上看,未发现有Ti—O—Si键形成,氧化钛多以TiO2的形式沉积在载体上;紫外光下的甲基橙光降解结果表明,TiO2颗粒大小和含量对光催化活性均有较大影响,6～7nm左右的TiO2颗粒有最佳的光催化效果.20% TiO2/SBA-15样品焙烧后五次重复利用效果基本得以保持.
The titanium sulfate was impregnated into the pores of SBA-15, and the anatase phase TiO2 uniformly dispersed in the nanopore was obtained by precipitation and calcination in situ at elevated temperature.The absorption spectra were characterized by TEM, BET, XRD, SAXD, Raman and UV- XPS, XRF, etc. The characterization results show that the modified SBA-15 still maintains ordered pores, and the particles of TiO2 are distributed more evenly inside the pores of SBA-15, Size of TiO2 particles play a better role in the growth restriction, from the Raman spectroscopy and XPS data point of view, found no Ti-O-Si bond formation, titanium oxide in the form of TiO2 deposited on the carrier; UV light The results of photodegradation of methyl orange showed that the particle size and content of TiO2 had a significant effect on the photocatalytic activity, and the best photocatalytic activity was obtained on the TiO2 particles of 6 ~ 7nm. After the sample of 20% TiO2 / SBA-15 was calcined Five times the basic effect of re-use to be maintained.