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Carbon nanotube/titania composites prepared by a micro-emulsion method exhibiting improved photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
40948 45872 2012 7 PDF Available
Title
Carbon nanotube/titania composites prepared by a micro-emulsion method exhibiting improved photocatalytic activity
Abstract

A micro-emulsion method was used to prepare TiO2-coated carbon nanotubes (ME-TCNTs). The physico-chemical properties of these composites were characterized by modern analytical tools. Crystalline TiO2 within the composites was composed solely of anatase. Carbon nanotubes (CNTs) within the composites were virtually uniformly covered with TiO2. CNT addition increased the surface area and the amount of hydroxyl groups on the composite surface, which suppressed the recombination of photo-generated electron/hole pairs (excitons). The composite photoactivity was greater than that of pure TiO2 and the commercial photocatalyst P25 for methylene blue degradation, predominantly due to the effect of CNT addition. An optimal TiO2 loading of 12% was found to result in the highest photoactivity in comparison with other two loadings (6% and 15%). Too little TiO2 or excessive CNT addition shielded the TiO2 and reduced the UV intensity, due to photon scattering by the bare CNTs. However, a high TiO2 content was found to be ineffective in suppressing exciton recombination because of the large distance between the TiO2 and CNTs. The photoactivity of ME-TCNTs was greater than that of TiO2 coated carbon nanotubes (TiO2-CNTs) prepared by the sol–gel method. The uniform nanometer-scale TiO2 layer on the CNT surface provided a high concentration of surface hydroxyl groups, a low exciton recombination rate and a high surface area.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (139 K)Download as PowerPoint slideHighlights► TiO2-coated carbon nanotubes (METCNTs) are prepared by a micro-emulsion method. ► METCNTs possess a high surface area and uniform titania layer. ► METCNTs show higher photoactivity than sol–gel TiO2/CNTs and commercial P25. ► A mechanism for highly efficient methylene blue degradation by METCNTs is proposed.

Keywords
Titania; Carbon nanotubes; Micro-emulsion; Photocatalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 1–7
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