(169c) The Synthesis and Characterization of Highly Visible-Active TiO2-Based Photocatalyst
AIChE Annual Meeting
2007
2007 Annual Meeting
Environmental and Regulatory Policy Issues in Nanotechnology
Environmental Effects on Nanomaterials
Tuesday, November 6, 2007 - 9:06am to 9:24am
The present study focuses on the photocatalytic activity of carbon-doped TiO2 prepared by the sol-gel method. The decomposition of acetaldehyde under visible light illumination showed that modified TiO2 catalyst had high activity under visible irradiation (> 420 nm), 8 times higher than that of commercial P25 TiO2. Catalysts were characterized by X-Ray powder diffraction (XRD), UV-vis diffuse reflectance spectrophotometer (DRS), X-Ray photoelectron spectroscopy (XPS), and surface area measurement by N2 adsorption-desorption. It was found that elemental carbon was doped both on the surface and inside the bulk of TiO2. The elemental carbon acted as a photosensitiser. Under visible light irradiation, the excited photosensitiser injected the electron into the conduction band of TiO2 and then the electron was transferred to adsorbed O2, producing superoxide radical anion O2?- which participated in the oxidation of acetaldehyde.
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