(169c) The Synthesis and Characterization of Highly Visible-Active TiO2-Based Photocatalyst

Authors: 
Yang, X., Kansas State University
Cao, C., Kansas State University
Erickson, L., Kansas State University
Maghirang, R. G., Kansas State University
Klabunde, K. J., Kansas State University

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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