催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (12): 1122-1126.

• 研究论文 • 上一篇    下一篇

室温水汽对Au/TiO2上光催化分解臭氧的影响

杨冬梅,贺攀科,董芳,张敏,杨建军   

  1. 河南大学特种功能材料重点实验室, 河南开封 475001
  • 收稿日期:2006-12-25 出版日期:2006-12-25 发布日期:2006-12-25

Effect of Water Vapor at Room Temperature on Photocatalytic Decomposition of Gaseous Ozone over Au/TiO2

YANG Dongmei, HE Panke, DONG Fang, ZHANG Min, YANG Jianjun*   

  1. Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, Henan, China
  • Received:2006-12-25 Online:2006-12-25 Published:2006-12-25

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摘要： 采用沉积-沉淀法制备了Au/TiO2光催化剂,并用紫外-可见漫反射光谱和X射线光电子能谱对其进行了表征,详细考察了室温水汽的引入对Au/TiO2光催化分解臭氧活性的影响. 结果表明,同干燥状态时相比,室温引入水汽后催化剂活性较低,并且较快地达到了稳定值. 催化剂的O 1s和Au 4f的XPS分析结果表明,水汽的存在导致TiO2的表面结构发生变化,进而使金-载体之间的相互作用力减弱. 这是导致催化剂活性下降的主要原因.

关键词: 室温水汽, 金, 二氧化钛, 光催化分解, 臭氧

Abstract: The Au/TiO2 photocatalyst was prepared by the deposition-precipitation method and was characterized by UV-Vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The influence of water vapor at room temperature on the photocatalytic activity of Au/TiO2 for ozone decomposition was studied. The results showed that the catalytic activity of Au/TiO2 decreased significantly when water vapor was introduced into the dried feed gas. In addition, the ozone removal rate over Au/TiO2 reached a steady value rapidly. The results of O 1s and Au 4f XPS showed that the surface structure of TiO2 was changed, and the interaction between the gold and the support was weakened in the presence of water vapor, which was responsible for the decrease in the photocatalytic activity of the catalyst.

Key words: room temperature water vapor, gold, titania, photocatalytic decomposition, ozone