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Photocatalytic antimicrobial activity of thin surface films of TiO2, CuO and TiO2 /CuO dual layers on Escherichia coli and bacteriophage T4

Ditta, IB, Steele, A, Liptrott, C, Tobin, J, Tyler, H, Yates, HM, Sheel, DW and Foster, HA 2008, 'Photocatalytic antimicrobial activity of thin surface films of TiO2, CuO and TiO2 /CuO dual layers on Escherichia coli and bacteriophage T4' , Applied Microbiology and Biotechnology, 79 (1) , pp. 127-133.

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    Abstract

    TiO2 coated surfaces are increasingly studied for their ability to inactivate microorganisms. The activity of glass coated with thin films of TiO2, CuO and hybrid CuO/TiO2 prepared by atmospheric Chemical Vapour Deposition (Ap-CVD) and TiO2 prepared by a sol-gel process was investigated using the inactivation of bacteriophage T4 as a model for inactivation of viruses. The chemical oxidising activity was also determined by measuring stearic acid oxidation. The results showed that the rate of inactivation of bacteriophage T4 increased with increasing chemical oxidising activity with the maximum rate obtained on highly active sol-gel preparations. However these were delicate and easily damaged unlike the Ap-CVD coatings. Inactivation rates were highest on CuO and CuO/TiO2 which had the lowest chemical oxidising activities. The inactivation of T4 was higher than that of Escherichia coli on low activity surfaces. The combination of photocatalysis and toxicity of copper acted synergistically to inactivate bacteriophage T4 and retained some selfcleaning activity. The presence of phosphate ions slowed inactivation but NaCl had no effect. The results show that TiO2/CuO coated surfaces are highly antiviral and may have applications in the food and healthcare industries.

    Item Type: Article
    Uncontrolled Keywords: Antimicrobial, bacteriophage T4, CVD, Escherichia coli, photocatalysis, surfaces, TiO2
    Themes: Built and Human Environment
    Health and Wellbeing
    Schools: Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
    Journal or Publication Title: Applied Microbiology and Biotechnology
    Publisher: Springer Verlag
    Refereed: No
    ISSN: 0175-7598
    Depositing User: HM Yates
    Date Deposited: 21 Oct 2011 10:54
    Last Modified: 20 Aug 2013 18:15
    URI: http://usir.salford.ac.uk/id/eprint/18579

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