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Title: Photocatalytic activity of WO x-TiO 2 under visible light irradiation
Authors: Li, XZ
Li, FB
Yang, CL
Ge, WK
Keywords: Methylene blue
Photocatalytic properties
Photoluminescence spectra
Surface photovoltage spectra
Titanium dioxide
Tungsten oxide
Issue Date: 2001
Source: Journal of photochemistry and photobiology a : chemistry, 2001, v. 141, no. 2-3, p. 209-217 How to cite?
Journal: Journal of Photochemistry and Photobiology A: Chemistry 
Abstract: With an attempt to extend light absorption of the TiO 2-based photocatalysts toward the visible light range and eliminate the rapid recombination of excited electrons/holes during photoreaction, new photocatalyst (WO x-TiO 2) powder was prepared by a sol-gel method. The photooxidation efficiency of WO x-TiO 2 catalyst was also evaluated by conducting a set of experiments to photodegrade methylene blue (MB) in aqueous solution. The photocatalytic activity of WO x-TiO 2 was examined by X-ray diffraction (XRD), UV-VIS absorption spectra, X-ray photoelectron emission spectroscopy (XPS), photoluminescence spectra (PL), surface photovoltage spectra (SPS) and electron-field-induced surface photovoltage spectra (EFISPS). The experiments demonstrated that the MB in aqueous solution was successfully photodegraded using WO x-TiO 2 under visible light irradiation. It was found that an optimal WO x dosage of 3% in WO x-TiO 2 achieved the highest rate of MB photodegradation in this experimental condition. It has been confirmed that WO x-TiO 2 could be excited by visible light (E<3.2eV) and the recombination rate of electrons/holes in WO x-TiO 2 declined due to the existence of WO 3 doped in TiO 2. The order of its photoactivity from weak to strong had a good agreement with that of PL intensity and that of EFISPS intensity from strong to weak.
ISSN: 1010-6030
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