Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (10): 978-981.doi: 10.3866/PKU.WHXB20031020

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Effect of Morphological Structure and Photoelectric Properties on Photocatalytic Performance of TiO2

Ding Zheng-Xin;Hou Yi-Dong;Li Dan-Zhen;Wang Xu-Xu;Fu Xian-Zhi;Liu Ping   

  1. Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002
  • Received:2003-04-14 Revised:2003-06-30 Published:2003-10-15
  • Contact: Li Dan-Zhen

Abstract: TiO2 photocatalysts prepared by sol-gel method were characterized by X-ray diffraction (XRD), UV diffuse reflectance spectroscopy (DRS), N2 adsorption BET method, surface photovoltage spectroscopy (SPS). A test compound ethylene in the gas phase was employed in the heterogeneous photocatalytic oxidation to investigate the effects of properties of TiO2 nanoparticles on photocatalytic performance. The results showed that crystal size of TiO2 increased slowly and its surface area downgraded with the increasing of calcination temperature; the crystal phase of TiO2 changed from anatase to rutile, the threshold of SPS decreased and the band edge red-shifted to yield smaller redox potential, leading to the significantly decreased of photocatalytic activity.

Key words: Photocatalysis, Titanium dioxide, Nanocrystalline, Surface photovoltage spectroscopy