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

Autor: Bong-Geun Song, Jong Ku Park, Kae-Myung Kang, Hyunseock Jie, Bo-In Park, So-Hye Cho
Rok vydání: 2013
Předmět:
Zdroj: Research on Chemical Intermediates. 40:115-126
ISSN: 1568-5675
0922-6168
DOI: 10.1007/s11164-013-1461-0
Popis: 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, Ti n+ (n = 4, 3, 2, 0) and W n+ (n = 6, 5, 4), were found in accordance with altering the annealing temperature.
Databáze: OpenAIRE
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