微波加热制备泡沫镍负载La3+掺杂纳米TiO2及其光催化降解甲醛的性能

 采用常规加热和微波加热方法制备了两种泡沫镍负载La3+掺杂的纳米TiO2光催化剂,以甲醛光催化降解为模型反应,考察了制备方法和掺杂La3+对催化剂催化性能的影响,并采用扫描电镜、透射电镜、 X射线衍射和能量分散式光谱分析对催化剂进行了表征. 结果表明,微波加热法制备的纳米TiO2具有典型的锐钛矿型晶体结构,其粒径均匀且明显小于常规加热法制备的催化剂. 泡沫镍负载1.5%La3+掺杂的TiO2的光催化性能得到明显改善,反应90 min后甲醛的降解率仍达到93%. 在实验中发现催化剂有失活现象,但经简单清洗后其活性能够恢复.

Preparation of Porous Nickel Mesh-Supported La3+-Doped TiO2 by Microwave and Its Photocatalytic Performance for Formaldehyde Degradation

The La~ 3 -doped TiO_2 photocatalysts were prepared by conventional method and microwave, respectively, and they were used for formaldehyde degradation. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and energy dispersive X-ray analysis were applied to characterize the photocatalysts. The results showed that the TiO_2 prepared by microwave had a crystalline structure of anatase, and its particles were well-dispersed and smaller than that prepared by conventional method. A 1.5%La~ 3 -doped TiO_2 was immobilized onto porous nickel mesh by coating and the prepared catalyst showed high photocatalytic activity for formaldehyde degradation. The conversion rate of formaldehyde was 93% after reaction for 90 min. The deactivation of TiO_2 photocatalyst was observed but it could be easily recovered by simple cleanness.