微波加热制备泡沫镍负载La^(3+)掺杂纳米TiO_2及其光催化降解甲醛的性能  

Preparation of Porous Nickel Mesh-Supported La^(3+)-Doped TiO_2 by Microwave and Its Photocatalytic Performance for Formaldehyde Degradation

作　　者：丁震[1] 陈晓东[1] 陈连生[1] 林萍[1] 付德刚[2] 袁春伟[2] 

机构地区：[1]江苏省疾病预防控制中心,江苏南京210009 [2]东南大学生物电子学国家重点实验室,江苏南京210096

出　　处：《催化学报》2006年第5期449-453,共5页

基　　金：国家高技术研究发展计划(863计划)(2002AA304302);江苏省社会科技发展项目(BS2002059)资助

摘　　要：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Ti O2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Ti O2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Ti O2的光催化性能得到明显改善,反应90min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.The La^3＋-doped TiO2 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 TiO2 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 TiO2 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 rain. The deactivation of TiO2 photocatalyst was observed but it could be easily recovered by simple cleanness.

关 键 词：微波 镧 掺杂 二氧化钛 泡沫镍 甲醛 光催化降解 

分 类 号：O643.32[理学—物理化学]