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Visible-light active black TiO2-Ag/TiOx particles

Paper ID Volume ID Publish Year Pages File Format Full-Text
45034 46395 2014 7 PDF Available
Title
Visible-light active black TiO2-Ag/TiOx particles
Abstract

•Visible-light active catalysts were made by scalable flame aerosol technology.•Thermally stable crystalline TiOx layers were formed onto nano-Ag and TiO2.•Strong photo-reduction and -oxidation of cationic species (Cr6+) and organics (MB).•Visible-light induced charge separation by TiOx was demonstrated by EPR.•Silver promote TiOx formation at high temperature and/or reducing conditions.

Visible-light active materials are sought in photocatalysis and solar energy utilization. Here a material architecture active under visible-light and comprising of titanium suboxide (e.g. Ti4O7, Ti3O5) layers onto nanosilver on nanostructured TiO2 is formed by flame aerosol technology. Abundant combustion intermediates present during flame synthesis of these materials partially reduce TiO2 and induce strong metal–support interactions (SMSI) resulting in crystalline Ti-suboxides as determined by X-ray diffraction. The growth of such suboxides can be controlled through their flame spray synthesis conditions allowing for tuning the light absorption intensity in the visible spectrum. The as-prepared Ti-suboxides are stable upon annealing in air, at least, up to 350 °C for 2 h. Their presence on the Ag/TiO2 particle surface and efficiency in generating photoinduced charge separation under visible light is demonstrated by electron paramagnetic resonance spectroscopy. Under visible light (λ > 400 nm), these nanoparticles exhibit strong photo-reduction of cationic species (Cr6+) and photo-oxidation of organics (methylene blue).

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Keywords
Nanosilver; Titanium oxide; Photocatalyst; Flame synthesis; Strong metal–support interaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 154–155, July–August 2014, Pages 9–15
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