The structural, morphological, and surface properties of tungsten-doped TiO2 nanopowders and their contribution to the photocatalytic activity
- The structural, morphological, and surface properties of tungsten-doped TiO2 nanopowders and their contribution to the photocatalytic activity
- 박보인; 지현석; 송봉근; 강계명; 박종구; 조소혜
- nanoparticle; TiO2; photocatalysis; TiO2 nanopowders; Chemical vapor synthesis; Tungsten; Doping
- Issue Date
- Research on chemical intermediates
- VOL 40, NO 1, 115-126
- 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.
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