焙烧温度对玻璃纤维网负载氮改性TiO_2的影响

Study on the influences of calcination temperature on fiberglass net loaded immobilized nitrogen modified TiO_2 catalyst

以尿素为改性剂,采用溶胶-凝胶法在玻璃纤维网上制备固定膜氮改性TiO_2催化剂。研究了焙烧温度对催化剂样品的影响。结果表明,不同温度(甚至焙烧温度达到800℃时)焙烧的样品均为锐钛矿型TiO_2。氮改性抑制了TiO_2从锐钛矿型向金红石型的转变。经400℃和500℃焙烧的氮改性催化剂发生了明显的红移现象。TiO_2改性是由取代性N和聚合敏化物共同作用的结果。N-TiO_2降解布洛芬的催化活性受晶粒大小、对紫外光响应和可见光不同响应的共同影响。最佳焙烧温度为500℃。

Immobilized membrane nitrogen modified TiO： catalyst has been prepared on the fiberglass net by sol-gel method with urea as modifying agent. The influence of calcination temperature on nitrogen modified TiO2 catalyst samples is investigated. The results indicate that the samples calcinated at different temperature（even calcinated as high as 800 ℃ ） are all of anatase type TiO2. Nitrogen modification inhibits the transition of TiO2 from anatase type to rutile type. An obvious red shift phenomenon occurs to the nitrogen modified catalyst after it has been calcinated at 400 ℃ and 500℃. TiO2 modification is a result from the combined action of substitutional N and polymeric sensitization. The nitrogen modified TiO2 degradation of ibuprofen catalytic activity can be influenced by the crystal size and different photoabsorbance responses of UV and visible light. The optimal calcination temperature is 500 ℃.