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Bactericidal activity under UV and visible light of cotton fabrics coated with anthraquinone-sensitized TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
55038 47038 2013 6 PDF Available
Title
Bactericidal activity under UV and visible light of cotton fabrics coated with anthraquinone-sensitized TiO2
Abstract

This study describes a method derived from ISO/TC 206/SC specifications to assess the bactericidal activity against a bacterial strain, Pseudomonas fluorescens, of various photocatalytic fabrics, under UVA and filtered visible light. The experimental method allowed the accurate quantification of bacteria survival on photoactive surfaces and films under UVA and UV-free visible irradiation.Cotton fabrics coated with TiO2, anthraquinone or anthraquinone-sensitized TiO2 display a significant bactericidal efficiency. TiO2-coated fabrics are very efficient against P. fluorescens after 4 h UVA irradiation (bacteria survival below the detection limit). Under UVA-free visible light, anthraquinone-sensitized TiO2 coated fabrics induced a significant bactericidal activity after 2 h irradiation, while anthraquinone alone-coated fabrics were not as efficient and TiO2 coated fabrics were almost inefficient. These results show that although exhibiting a weak n–π* band in the 350–420 nm range, anthraquinone is a good candidate as an efficient visible light photosensitizer. A synergy effect between anthraquinone and TiO2 was demonstrated. A possible reaction mechanism, involving a synergy effect for singlet oxygen formation with anthraquinone-sensitized TiO2 is proposed to account for these results.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (223 K)Download as PowerPoint slideHighlights► Accurate determination of bactericidal activity of films and surfaces. ► UVA and filtered visible light experiments. ► Photocatalytic coatings with anthraquinone, TiO2 or anthraquinone-sensitized TiO2. ► Singlet oxygen sensitization for bactericidal activity.

Keywords
Bactericidal fabrics; Photocatalysis; Dye-sensitized TiO2; Anthraquinone; UVA; Visible light
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Bactericidal activity under UV and visible light of cotton fabrics coated with anthraquinone-sensitized TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 209, 15 June 2013, Pages 134–139
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