Journal
APPLIED SURFACE SCIENCE
Volume 332, Issue -, Pages 172-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.01.110
Keywords
(N, S and C) co-doping; TiO2; Calcination temperature; Photocatalytic activity; Visible light; Cr(VI)
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Funding
- Natural Science Foundation-Steel and Iron Foundation of Hebei Province [E2012501012]
- National Basic Research of Program of China [2014CB643405]
- National Natural Science Foundation of China [51204036]
- Basic Scientific Research costs of Central Colleges [N110423003]
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The (N, S and C) co-doped TiO2 samples (NSC-TiO2) were synthesized by the sol-gel method combining with the high energy ball milling method calcined at the different temperature (400-700 degrees C), employing butyl titanate as the titanium source and thiourea as the doping agent. The structures of NSC-TiO2 samples were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (DRS), X-ray photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), scanning electron microscopy (SEM) and nitrogen adsorption-desorption isotherms. The photocatalytic activities were checked through the photocatalytic reduction of Cr(VI) as a model compound under visible light irradiation. The results showed that the (N, S and C) co-doping and the calcination temperature played important role on the microstructure and photocatalytic activity of the samples. According to XPS spectra, sulfur was mainly attributed to the Ti-O-S bond; nitrogen was ascribed to the Ti-O-N and Ti-N bonds; carbon was assigned to the Ti-O-C bond in the NSC-TiO2 samples. (N, S and C) co-doped TiO2 samples calcinated at 500 degrees C exhibits higher photocatalytic activity than that of the other samples under visible light irradiation, which can be attributed to the synergic effect of its enhancing crystallization of anatase and (N, S and C) co-doping. (C) 2015 Elsevier B.V. All rights reserved.
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