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Enhanced photocatalytic activity of hierarchical macro/mesoporous TiO2–graphene composites for photodegradation of acetone in air

Paper ID Volume ID Publish Year Pages File Format Full-Text
46642 46444 2012 8 PDF Available
Title
Enhanced photocatalytic activity of hierarchical macro/mesoporous TiO2–graphene composites for photodegradation of acetone in air
Abstract

Graphene, a single layer of graphite, possesses a unique two-dimensional structure, high conductivity, superior electron mobility and extremely high specific surface area, and can be obtained on a large scale at low cost. Thus, it has been regarded as an excellent catalyst support. Recently, graphene-based semiconductor photocatalysts have attracted more attention due to their enhanced photocatalytic activity. In this work, hierarchical macro/mesoporpous TiO2–graphene composites with low loadings (0–0.2 wt.%) of graphene were first produced by a simple one-step hydrothermal method using tetrabutyl titanate as the titanium precursor. The prepared composite samples presented enhanced photocatalytic activity in photodegradation of acetone in air. Graphene content exhibited an obvious influence on photocatalytic activity and the optimal graphene addition content was determined. At the optimal graphene concentration (0.05 wt.%), the prepared composites showed the highest photocatalytic activity, exceeding that of pure TiO2 and Degussa P-25 by a factor of 1.7 and 1.6, respectively. The enhanced photocatalytic activity is due to graphene as an excellent electron acceptor and transporter, thus reducing the recombination of charge carriers and enhancing the photocatalytic activity. The transient photocurrent response experiment further confirmed the transfer of photogenerated electrons from TiO2 to graphene and the suggested mechanism.

Graphical abstractHierarchical macro/mesoporpous TiO2–graphene composites with low loadings (0.05 wt.%) of graphene showed an enhanced photocatalytic activity in photodegradation of acetone in air.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Hierarchical macro/mesoporpous TiO2–graphene composites with low loadings (0–0.2 wt.%) of graphene were prepared. ► The prepared samples showed enhanced photocatalytic activity in photodegradation of acetone in air. ► At graphene content = 0.05 wt.%, the TiO2–graphene composites exhibited the highest photocatalytic activity, which exceeds that of pure TiO2 by a factor of 1.7. ► The transient photocurrent response experiment confirmed the transfer of photogenerated electrons from TiO2 to graphene.

Keywords
Hierarchical; Macro/mesoporous; Graphene; Titania; Photocatalytic activity
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Enhanced photocatalytic activity of hierarchical macro/mesoporous TiO2–graphene composites for photodegradation of acetone in air
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 109–116
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