摘要：

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TiO₂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TiO₂。氮改性抑制了TiO₂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。TiO₂改性是由取代性N和聚合敏化物共同作用的结果。N-TiO₂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℃。

关键词: 氮改性TiO₂, 溶胶-凝胶法, 焙烧温度, 布洛芬

Abstract:

Immobilized membrane nitrogen modified TiO₂ 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℃.

Key words: nitrogen modified titanium dioxide, sol-gel method, calcinations temperature, ibuprofen

中图分类号: 

• X703