催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (5): 449-453.

• 研究论文 • 上一篇    下一篇

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

丁震1,2,陈晓东1,陈连生1,林萍1,付德刚2,袁春伟2   

  1. 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
  • 收稿日期:2006-05-25 出版日期:2006-05-25 发布日期:2006-05-25

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

DING Zhen1,2*, CHEN Xiaodong1, CHEN Liansheng1, LIN Ping1, FU Degang2, YUAN Chunwei2   

  1. 1 Jiangsu Centers for Diseases Prevention and Control, Nanjing 210009, Jiangsu, China; 2 State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2006-05-25 Online:2006-05-25 Published:2006-05-25

PDF

895

被引次数

49

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.

关键词: 微波, 镧, 掺杂, 二氧化钛, 泡沫镍, 甲醛, 光催化降解

Abstract: The La3+-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%La3+-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 min. The deactivation of TiO2 photocatalyst was observed but it could be easily recovered by simple cleanness.

Key words: microwave, lanthanum, doping, titania, porous nickel, formaldehyde, photocatalytic degradation