کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
584477 | 1453182 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis, characterization, and photocatalytic activity of TiO2âxNx nanocatalyst
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Nitrogen-doped titanium dioxide powders were prepared by wet method, that is, the hydrolysis of acidic tetra-butyl titanate using aqueous ammonia solution, followed by calcination at temperatures about 350 °C. The catalysts exhibited photocatalytic activity in the visible light region owing to N-doping. The light absorption onset of TiO2âxNx was shifted to the visible region at 459 nm compared to 330 nm of pure TiO2. An obvious decrease in the band gap was observed by the optical absorption spectroscopy, which resulted from N2p localized states above the valence band of TiO2âxNx (compared to TiO2). The TiO2âxNx catalyst was characterized to be anatase with oxygen-deficient stoichiometry by X-ray diffraction (XRD), surface photovoltage spectroscopy (SPS) and X-ray photoelectron spectroscopy (XPS). The binding energy of N1s measured by XPS characterization was 396.6 eV (TiN bonds, β-N) and 400.9 eV (NN bonds, γ-N2), respectively. The photocatalytic activity of TiO2âxNx under visible light was induced by the formation of β-N in the structure. Photocatalytic decomposition of benzoic acid solutions was carried out in the ultraviolet and visible (UV-vis) light region, and the TiO2âxNx catalyst showed higher activity than pure TiO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 144, Issues 1â2, 1 June 2007, Pages 328-333
Journal: Journal of Hazardous Materials - Volume 144, Issues 1â2, 1 June 2007, Pages 328-333
نویسندگان
Y.Q. Wang, X.J. Yu, D.Z. Sun,