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Effects of silica coating on photocatalytic reactions of anatase titanium dioxide studied by quantitative detection of reactive oxygen species

Paper ID Volume ID Publish Year Pages File Format Full-Text
46008 46428 2013 5 PDF Available
Title
Effects of silica coating on photocatalytic reactions of anatase titanium dioxide studied by quantitative detection of reactive oxygen species
Abstract

The effects of silica coating on the photocatalytic properties of anatase titanium dioxide (TiO2) were studied by quantitative detection of reactive oxygen species under UV-irradiation, because the surface modification with silica has been practically used to suppress the photocatalytic activity in organic supports. For reactive oxygen species such as superoxide radicals (O2−), H2O2, and OH radicals, the detection methods using MCLA chemiluminescence, lucigenin chemiluminescence, and coumarin fluorescence were employed respectively. By comparing silica-coated TiO2 with uncoated TiO2 powders, the amount of H2O2 detected under UV irradiation was significantly decreased by silica coating. Thus the silica modification suppressed the release of H2O2, which may be the nature of the effect of silica coating for suppressing photocatalytic activity against organic supports.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Active oxygens were quantitatively detected for UV-irradiated anatase TiO2 suspension. ► H2O2 was produced from both oxidation of water and reduction of O2. ► By silica coating, the photocatalytic formation of H2O2 was significantly suppressed. ► The weather resistance by silica coating may be explained by the suppression of H2O2.

Keywords
Titanium dioxide; Silica coating; Photocatalytic reaction; Reactive oxygen species
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Effects of silica coating on photocatalytic reactions of anatase titanium dioxide studied by quantitative detection of reactive oxygen species
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 282–286
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