Efficient Complete Oxidation of Acetaldehyde into CO2 Over Au/TiO2 Core–Shell Nano Catalyst Under UV and Visible Light Irradiation
Abstract:Photocatalytic degradation of acetaldehyde and its photocatalytic mechanisms over Au/TiO2 core–shell nano catalyst were, for the first time, investigated under UV and visible light irradiation. The results indicate that Au/TiO2 core–shell catalyst shows higher activity for the oxidation of acetaldehyde into CO2 under both UV and visible light irradiation comparing with P-25 and metal-deposited TiO2 photocatalysts. When Au/TiO2 core–shell catalyst is excited by UV light, the Au-core acts as the sink to restore the separated electrons, thus to improve the photoinduced charge separation; while under visible light irradiation, the mechanism can be understood as the coordinate effect of the plasmon resonance of Au-core particles and the formation of an impurity energy level induced by TiO2−xFx.
Document Type: Research Article
Publication date: 2009-10-01
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