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

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    Type
    Article
    Authors
    Rahal, Raed
    Le Béchec, Mickaël
    Guyoneaud, Rémy
    Pigot, Thierry
    Paolacci, H.
    Lacombe, Sylvie M.
    KAUST Department
    KAUST Catalysis Center (KCC)
    Date
    2013-06
    Permanent link to this record
    http://hdl.handle.net/10754/562791
    
    Metadata
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    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. © 2012 Elsevier B.V. All rights reserved.
    Citation
    Rahal, R., Le Bechec, M., Guyoneaud, R., Pigot, T., Paolacci, H., & Lacombe, S. (2013). Bactericidal activity under UV and visible light of cotton fabrics coated with anthraquinone-sensitized TiO2. Catalysis Today, 209, 134–139. doi:10.1016/j.cattod.2012.10.012
    Publisher
    Elsevier BV
    Journal
    Catalysis Today
    DOI
    10.1016/j.cattod.2012.10.012
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cattod.2012.10.012
    Scopus Count
    Collections
    Articles; KAUST Catalysis Center (KCC)

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