Preparation, Characterization of Sulfur-Doped Nanosized TiO₂ and Photocatalytic Degradation of Methylene Blue Under Visible Light

Sulfur-doped TiO₂ catalysts were prepared by a mechanochemical method. The prepared catalysts exhibited photocatalytic activity in methylene blue degradation under visible light. The catalyst structure has been characterized using UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ra...

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Bibliographic Details
Published in:Catalysis letters 2010-10, Vol.139 (1-2), p.77-84
Main Authors: Ang, Thiam Peng, Law, Jia Yan, Han, Yi-Fan
Format: Article
Language:English
Subjects:
Anatase
Ball milling
Brookite
Catalysis
Catalysts
Catalytic activity
Chemistry
Chemistry and Materials Science
Dyes
Exact sciences and technology
Fourier transforms
General and physical chemistry
Industrial Chemistry/Chemical Engineering
Infrared analysis
Infrared spectroscopy
light
Mechanochemical method
Methylene blue
Methylene blue degradation
Organometallic Chemistry
Photocatalysis
Photochemistry
Photodegradation
Photoelectrons
Physical Chemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Spectrum analysis
Sulfur
Sulfur-doped TiO
Synergetic effect
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thermogravimetry
Titanium dioxide
Transmission electron microscopy
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Sulfur-doped TiO₂ catalysts were prepared by a mechanochemical method. The prepared catalysts exhibited photocatalytic activity in methylene blue degradation under visible light. The catalyst structure has been characterized using UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetry analysis (TGA) as well as Fourier transform infrared spectroscopy (FT-IR). UV-visible spectroscopy revealed that the absorption edge of the doped TiO₂ was red-shifted compared with bare TiO₂. XRD patterns suggested that the brookite phase became more prevalent with increasing ball milling duration. In addition, surface sulfate species were detected by FT-IR, XPS and TGA. We deduce the rise of catalytic activity is due to the synergetic effect between the brookite phase and the anatase phase that would probably retard the electron-hole recombination. On the other hand, methylene blue was found to be N-demethylated during the irradiation thus giving rise to blue-shifting of peak at 664 nm in UV-visible spectroscopy.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-010-0390-4