微波辅助法制备纳米TiO_2及其光催化性能  

Photocatalysis characterization of TiO_2 nanoparticles prepared with Sol-Gel method under Microwave Radiation

作　　者：张新玉[1] 李静霞[1] 曹锋雷[1] 霍宇凝[1] 李和兴[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《上海师范大学学报（自然科学版）》2006年第3期47-51,共5页Journal of Shanghai Normal University(Natural Sciences)

基　　金：国家自然科学基金(20377031)

摘　　要：在微波条件下采用Sol-Gel法制备了纳米TiO_2光催化剂,通过XRD,TEM,BET,荧光吸收等考察了焙烧温度对TiO_2结构的影响．以光催化降解苯酚反应为探针,考察了微波对于TiO_2活性的影响．结果表明,微波用于凝胶合成能够显著提高TiO_2的光催化活性,降低由锐钛矿型向金红石型的转化温度．这主要归因于微波加热可以提高反应物的分散度,在低温焙烧就可得到高结晶度的锐钛矿型TiO_2,且晶粒均匀．A new TiO2-based photoeatalyst was synthesized by Sol - Gel method under microwave radiation and was denoted as TiO2-MW. During phenol photocatalytie degradation in aqueous solution, the TiO2 -MW exhibited much higher activity than the corresponding TiO2-DC obtained via direct calcination. XRD, TEM, BET, and fluorescence spectra revealed that the preparation of TiO2 under microwave radiation could affect the TiO2 structure. The promoting effect of microwave could be attributed to the uniform nanoparticles and increasing surface area which facilitated the adsorption of both the UV light and the phenol molecules. It could also be attributed to the enhancement of the crystallization degree of anatase in TiO2 under low calcination temperature. As well known, the anatase phase was more active than the rutile in photocatalysis and the increase of anatase crystallization degree was favorable for its photocatalytie activity.

关 键 词：二氧化钛 光催化 微波辐射 Sol—Gel法 苯酚降解 

分 类 号：O643.322[理学—物理化学]