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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 1: 61 - 65

DOI: https://doi.org/10.3724/SP.J.1077.2008.00061

Research Paper

Effects of Heat Treatment and Atmosphere on the Visible Light Photocatalytic Activity of Nano-TiO2

  • ZHOU Wu-Yi ,
  • TANG Shao-Qiu ,
  • Wei Ze-Bin ,
  • XU Yue-Hua ,
  • LU Qi-Ming
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  • (1. Department of Applied Chemistry. College of Science, South-China Agricultural University. Guangzhou 510642, China; 2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China; 3. College of Resource and Environment, South China Agricultural University, Guangzhou 510642, China)

Received date: 2006-12-31

  Revised date: 2007-04-24

  Online published: 2008-01-20

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Abstract

The nano-TiO2 powders were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscope (XPS). The results show that nano-TiO2 is transformed to rutile crystal after treating at 400℃ in N2 atmosphere and the nano-TiO2 particles obtained are uniform. Part N atoms are intruded into the TiO2 crystals and substituted for some of O atoms, which produce oxygen defects. Those oxygen defects become the center of photo activity, which result in the increase of absorbed photons and the formation of broad band gap and make the absorption spectrum move to the visible light. The photocatalytic degradation of methylene blue shows that the visible light catalytic activity of nano-TiO2 calcined in N2 atmosphere is improved.


Key words： nano-TiO2; heat treatment; atmosphere; visible-light catalytic

Cite this article

ZHOU Wu-Yi , TANG Shao-Qiu , Wei Ze-Bin , XU Yue-Hua , LU Qi-Ming . Effects of Heat Treatment and Atmosphere on the Visible Light Photocatalytic Activity of Nano-TiO2[J]. Journal of Inorganic Materials, 2008 , 23(1) : 61 -65 . DOI: 10.3724/SP.J.1077.2008.00061

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