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Effect of Au supported TiO2 with dominant exposed {0 0 1} facets on the visible-light photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
46647 46444 2012 10 PDF Available
Title
Effect of Au supported TiO2 with dominant exposed {0 0 1} facets on the visible-light photocatalytic activity
Abstract

Novel visible-light-driven plasmonic photocatalyst Au/TiO2 nanosheets with a high percentage of exposed {0 0 1} facets were fabricated by hydrothermal treatment of tetrabutyl titanate and hydrofluoric acid, followed by the polyol reduction process (denoted by Au/TiO2-0 0 1). The prepared samples were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2-sorption, UV-vis diffuse reflectance spectroscopy, and photoluminescence spectra. The variations of photoelectric response after depositing Au nanoparticles (NPs) on TiO2-0 0 1 nanosheets were investigated by the photoelectrochemical experiment. The results display that the Au NPs with average diameter of ca. 5 nm were deposited on (0 0 1) facet of TiO2 nanosheets in the form of metallic state. The samples exhibited a strong absorption in the visible light region due to the surface plasmon resonance (SPR) effect of Au NPs. For the photocatalytic degradation of rhodamine B (RhB) in aqueous solution, the Au/TiO2-0 0 1 showed superior photocatalytic activities compared with bare TiO2-0 0 1 and other Au deposited photocatalysts, such as Au/P25 (Degussa TiO2), Au/anatase TiO2, and Au/rutile TiO2. The enhanced photocatalytic activities can be explained by its unique morphology, larger surface area, and smaller crystallite. Meanwhile, TiO2 dominated {0 0 1} facets with higher electron mobility and better adsorption of pollutant molecule may be another reason for the higher photocatalytic activity. In addition, the Au NPs are believed to play an essential role in enhancing the photoreactivity because they are able to generate photoelectrons and enhance the visible light absorption intensity. The effects of the Au content, the calcination temperature of TiO2-0 0 1, the supporter, and the reaction atmosphere on photocatalytic activities were investigated in detail. The decomposition mechanism of RhB over Au/TiO2-0 0 1 under visible light irradiation and the active species in the photocatalytic process had also been discussed. It is hoped that our work could render guided information for steering toward the design and application of noble metal/semiconductor nanocompositions with high visible-light photocatalytic activity.

Graphical abstractNovel Au/TiO2 nanosheet photocatalyst with dominant exposed {0 0 1} facets is successfully prepared for the first time. Compared with the other plasmonic photocatalyst Au/TiO2, such as Au/P25, Au/anatase TiO2, and Au/rutile TiO2, our photocatalyst shows much higher photocatalytic activity for the degradation of RhB.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Novel Au/TiO2 with dominant exposed {0 0 1} facets is successfully prepared. ► SPR effect of Au NPs ensures the catalysts work under the visible light irradiation. ► Au/TiO2-0 0 1 samples show superior visible light photocatalytic activities for RhB. ► Relationship between photoelectric response and photoactivity was investigated. ► Roles of (0 0 1) facet on the photocatalysis and photoelectrochemistry are discussed.

Keywords
TiO2 nanosheets; Au nanoparticles; {0 0 1} facets; Plasmonic photocatalyst; Visible light
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Effect of Au supported TiO2 with dominant exposed {0 0 1} facets on the visible-light photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 146–155
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us