期刊
APPLIED SURFACE SCIENCE
卷 254, 期 13, 页码 3762-3766出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2007.11.047
关键词
TiO2/C composites; visible-light; solvothermal method; photocatalysis
Preparation of anatase type titania nanoparticles and their carbon modification were synchronously achieved by the solvothermal method with glycerol as the carbon source. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and diffuse reflectance spectra (DRS). It was found that the glycerol/ethanol ratio affected significantly the morphology and properties of TiO2/C composites. The TiO2/C composite which was obtained in the solution with the glycerol/ethanol ratio of 5/75, contained 1.2 mass% carbon and exhibited both superior adsorption capability and visible-light photocatalytic activity. Contrary to this, samples prepared in the solution with higher glycerol/ethanol ratio, exhibited lower photocatalytic activity similar to that of the titania without carbon modification. It was suggested that excess addition of glycerol might contribute to large amounts of carbonaceous species and severe aggregation of the as-prepared samples, and thus reduced the surface area. As a result, the adsorption capability and visible-light photocatalytic activity increased at first and then decreased with the increase of glycerol addition. Present study provided a facile one-step method to obtain TiO2/C composites with a controllable carbon content and photocatalytic performance under mild temperature. (C) 2008 Elsevier B.V. All rights reserved.
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