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Synthesis and photocatalytic properties of nanocrystalline Au, Pd and Pt photodeposited onto mesoporous RuO2-TiO2 nanocomposites

Paper ID Volume ID Publish Year Pages File Format Full-Text
40793 45866 2012 7 PDF Available
Title
Synthesis and photocatalytic properties of nanocrystalline Au, Pd and Pt photodeposited onto mesoporous RuO2-TiO2 nanocomposites
Abstract

Noble metals (Au, Pd and Pt) have been photodeposited onto hexagonal mesoporous RuO2-TiO2 nanocomposites to study their influence on the photocatalytic activity under UV and visible lights by determination of the formation rate of HCHO generated by photooxidation of CH3OH in aqueous solution. X-ray diffraction (XRD) patterns and N2 sorption isotherms reveal that highly crystalline TiO2 and mesoporous structure have been formed with high surface area (150–180 m2/g) and pore diameter ranging from 6.8 to 7.3 nm. TEM measurements show that the framework of the highly crystalline mesoporous RuO2-TiO2 is composed of anatase phase grown along [1 0 1] direction. The dependence of HCHO formation rate on the noble metals/RuO2-TiO2 nanocomposites, behaves quite differently depending on noble metals as electrons sink. Under UV light, the findings reveal that Pd/RuO2-TiO2 offers an improvement in term photooxidation rate of CH3OH and photonic efficiencies over Pt/RuO2-TiO2 and Au/RuO2-TiO2. However, under visible light, the photocatalytic activity of mesoporous RuO2-TiO2 containing Au nanoparticles towards CH3OH oxidation is remarkable and the photonic efficiency of RuO2-TiO2 has been improved two times. Pt and Pd nanoparticles could not be observed in any improvement in photocatalytic activity of RuO2-TiO2 under visible light.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (133 K)Download as PowerPoint slideHighlights► Noble metals have been photodeposited onto mesoporous RuO2-TiO2 photocatalysts. ► Under UV light, Pd/RuO2-TiO2 is much than other. ► Under visible light, the photonic efficiency of RuO2-TiO2 improved two times by addition Au. ► Pt and Pd could not be improved the photocatalytic activity of RuO2-TiO2.

Keywords
Noble metals; RuO2-TiO2 ;Mesoporous; Photooxidation; Methanol; UV and visible light
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Synthesis and photocatalytic properties of nanocrystalline Au, Pd and Pt photodeposited onto mesoporous RuO2-TiO2 nanocomposites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 431–432, 26 July 2012, Pages 62–68
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
Online Support
Any Questions? feel free to contact us