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  • Comparative Studies of Photocatalytic and Photoelectrocatalytic Inactivation of E. coli in Presence of Halides

    Author(s)
    Li, Guiying
    Liu, Xiaolu
    Zhang, Haimin
    Wong, Po-Keung
    An, Taicheng
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Year published
    2013
    Metadata
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    Abstract
    The bactericidal performances of photocatalytic and photoelectrocatalytic systems in absence and presence of low concentrations of X- (X = Br, Cl) were quantitatively studied and meaningfully compared under identical experimental conditions. The photoelectrocatalytic system in presence of low concentration of Br- was found to be the most effective bactericidal system amongst all systems investigated, capable of inactivating 100% of 9.0 x 106 CFU/mL Escherichia coli within 1.57 s. The photocatalytically generated active oxygen species are important attributes to the bactericidal performance of all cases investigated except ...
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    The bactericidal performances of photocatalytic and photoelectrocatalytic systems in absence and presence of low concentrations of X- (X = Br, Cl) were quantitatively studied and meaningfully compared under identical experimental conditions. The photoelectrocatalytic system in presence of low concentration of Br- was found to be the most effective bactericidal system amongst all systems investigated, capable of inactivating 100% of 9.0 x 106 CFU/mL Escherichia coli within 1.57 s. The photocatalytically generated active oxygen species are important attributes to the bactericidal performance of all cases investigated except the case of photoelectrocatalytic inactivation in presence of Br- for which the bactericidal performance is dominated by the photoelectrocatalytically generated Brradical dot-/Br2radical dot-. The results revealed that in a photocatalysis or photoelectrocatalysis bactericidal process, X- acts as an electron mediator that does not change its chemical form before and after bactericidal process, and a high bactericidal performance photoelectrocatalytic system can be established with Br- concentration as low as 50 卮 The findings of this work confirm that new forms of effective bactericides such as Xradical dot-/X2radical dot- can be generated in situ via a photocatalysis or photoelectrocatalysis process for high performance bactericidal system.Keywords: Biohazards; Disinfection; Brradical dot-/Br2radical dot-; Photocatalysis; Photoelectrocatalysis
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    Journal Title
    Applied Catalysis B: Environmental
    Volume
    140-141
    DOI
    https://doi.org/10.1016/j.apcatb.2013.04.004
    Subject
    Inorganic chemistry not elsewhere classified
    Physical chemistry
    Chemical engineering
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/60371
    Collection
    • Journal articles

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