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The structural, morphological, and surface properties of tungsten-doped TiO2 nanopowders and their contribution to the photocatalytic activity

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Abstract

Tungsten-doped TiO2 nanopowders (W-TiO2) were prepared by chemical vapor synthesis and the effects of a post-heat treatment on their physical, surface, and photocatalytic properties were investigated. The W-TiO2 nanopowders containing about 1.0 mol % of tungsten were obtained and annealed from 400 to 700 °C. The as-synthesized and annealed W-TiO2 nanopowders were carefully examined for their crystalline and opto-electronic structure and morphology by means of X-ray diffraction, UV–Vis spectroscopy, and transmission electron microscopy. In addition, the surface condition was investigated by X-ray photoelectron spectroscopy. The photocatalytic activities were studied by the oxidative degradation of 2-propanol under UV light irradiation. We found that the photocatalytic activity of W-TiO2 varied significantly with the temperature of the heat treatment, exceeding the performance of P25 after annealing at 600 °C. Interestingly, the chemical composition of titanium and tungsten of W-TiO2 played a crucial role to its photocatalytic activity as the mixed valence states, Tin+ (n = 4, 3, 2, 0) and Wn+ (n = 6, 5, 4), were found in accordance with altering the annealing temperature.

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Acknowledgments

We acknowledge financial support from KIST institutional funding (Project No. 2E23891). We give special thanks to Prof. M. Anpo (Osaka Prefecture University) for giving us valuable comments to improve this manuscript. S.H.C. appreciates the time and effort given by Prof. M. Matsuoka in organizing this special issue for the OPU–KIST–ECUST joint symposium.

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Authors and Affiliations

  1. Center for Materials Architecturing, Institute of Multidisciplinary Convergence of Materials, Korea Institute of Science and Technology, Seoul, 130-650, Republic of Korea

    Bo-In Park, Hyunseock Jie, Bong-Geun Song, Jong-Ku Park & So-Hye Cho

  2. Department of Materials Science & Engineering, Seoul National University of Science and Technology, Seoul, 139-743, Republic of Korea

    Bo-In Park & Kae-Myung Kang

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  1. Bo-In Park
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  2. Hyunseock Jie
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Correspondence to So-Hye Cho.

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Park, BI., Jie, H., Song, BG. et al. The structural, morphological, and surface properties of tungsten-doped TiO2 nanopowders and their contribution to the photocatalytic activity. Res Chem Intermed 40, 115–126 (2014). https://doi.org/10.1007/s11164-013-1461-0

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  • DOI: https://doi.org/10.1007/s11164-013-1461-0

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