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Undoped visible-light-sensitive titania photocatalyst

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Abstract

Colorful rutile TiO2 was prepared by heating Ti2O3 at 550–900 °C to develop novel visible-light-sensitive and eco-friendly photocatalysts for environmental remediation under visible-light irradiation. The colors of the prepared samples, which ranged from grayish green to yellowish off-white via yellow differed from the reported colors of reduced TiO2, such as blue and black. The TiO2 prepared in this study was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and UV–Visible spectroscopy. These measurements showed that the TiO2 contained Ti3+-interstitial sites. The TiO2 was sensitive to visible light, and calculation of the band diagram demonstrated that this visible-light absorption is caused mainly by formation of Ti3+-interstitial sites in rutile TiO2. Among the prepared samples, the TiO2 prepared by heating Ti2O3 at 700 °C shows the highest photocatalytic activity under visible-light irradiation. In addition, the sample was further and mildly ground using a bead-milling machine. The ground sample possessed higher surface area and better photocatalytic activity.

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Authors and Affiliations

  1. Catalytic Materials Group, Research Unit for Environmental Remediation Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan

    Tetsuya Kako, Naoto Umezawa, Kui Xie & Jinhua Ye

Authors
  1. Tetsuya Kako
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  2. Naoto Umezawa
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  3. Kui Xie
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  4. Jinhua Ye
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Correspondence to Tetsuya Kako.

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Kako, T., Umezawa, N., Xie, K. et al. Undoped visible-light-sensitive titania photocatalyst. J Mater Sci 48, 108–114 (2013). https://doi.org/10.1007/s10853-012-6888-y

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  • DOI: https://doi.org/10.1007/s10853-012-6888-y

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