物理化学学报 >> 2002, Vol. 18 >> Issue (04): 332-335.doi: 10.3866/PKU.WHXB20020409

研究论文 上一篇    下一篇

微波-光催化耦合效应及其机理研究

李旦振;郑宜;付贤智   

  1. 福州大学光催化研究所，福州　350002
  • 收稿日期:2001-09-25 修回日期:2001-12-21 发布日期:2002-04-15
  • 通讯作者: 付贤智 E-mail:xzfu@fzu.edu.cn

Study on the Effect and Mechanism of the Coupling between Microwave and Photocatalysis

Li Dan-Zhen;Zheng Yi;Fu Xian-Zhi   

  1. Research Institute of Photocatalysis, Fuzhou University, Fuzhou　350002
  • Received:2001-09-25 Revised:2001-12-21 Published:2002-04-15
  • Contact: Fu Xian-Zhi E-mail:xzfu@fzu.edu.cn

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摘要： 采用溶胶凝胶法制备了TiO2和/TiO2催化剂，运用XRD、BET比表面积测定及微波吸收谱等技术对催化剂的结构进行了表征，并以C2H4为模型反应物考察了微波对催化剂的光催化氧化反应性能的影响.研究结果表明，在微波场中TiO2和/TiO2催化剂的光催化氧化性能得到明显改善.时间分辨紫外可见吸收谱证实微波场的存在有效地提高了催化剂对紫外光的吸收率.因此，微波场与紫外光的耦合使光催化活性提高的可能原因是微波场对多缺陷催化剂的极化作用,提高了光致电子的跃迁几率，并在半导体表面形成陷阱中心,降低了电子空穴对的复合率.

关键词: 纳米二氧化钛, 光催化氧化, 微波, 乙烯

Abstract: The TiO2 and /TiO2 catalysts were prepared by solgel method and charaterized by Xray diffraction, N2 absorption analysis applying BET method, and microwave absorption spectrum. Photocatalytic oxidation of C2H4 in air stream was studied. The results(see Fig.1) showed that the photocatalytic activity of both /TiO2 and TiO2 catalysts was obviously increased under the reaction condition of ultraviolet(UV) combined with microwave(MW). The time resolved UVVis absorption spectrum substantiated that absorptivity of UV of catalysts was effectively enhanced in the presence of microwave field(see Fig.2). The improvement on photocatalytic activity was attributed to the polarization effect of the highly defected catalysts in microwave field, which increased the transition probability of photongenerated electrons and decreased the electronhole recombination on semiconductor surface.

Key words: Nanotitania, Photocatalytic oxidation, Microwave, Ethylene