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  • Comparative study on the photoelectrocatalytic inactivation of Escherichia coli K-12 and its mutant Escherichia coli BW25113 using TiO2 nanotubes as a photoanode

    Author(s)
    Nie, Xin
    Li, Guiying
    Gao, Minghui
    Sun, Hongwei
    Liu, Xiaolu
    Zhao, Huijun
    Wong, Po-Keung
    An, Taicheng
    Griffith University Author(s)
    Zhao, Huijun
    Liu, Xiaolu
    Year published
    2014
    Metadata
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    Abstract
    Photoelectrocatalytic (PEC) and photocatalytic (PC) inactivation of ancestor Escherichia coli K-12 and its mutant E. coli BW25113 were systematically compared using a TiO2 nanotubular photoanode. The results showed that PEC inactivation was more effective to both bacterial strains than PC process, and E. coli BW25113 showed higher resistance than E. coli K-12 in both PEC and PC systems. The findings indicate that the two strains with different genes are varied in their susceptibilities and responses to the PEC and PC treatments. The h+ was found to be the major reactive species and predominantly responsible for PEC inactivation. ...
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    Photoelectrocatalytic (PEC) and photocatalytic (PC) inactivation of ancestor Escherichia coli K-12 and its mutant E. coli BW25113 were systematically compared using a TiO2 nanotubular photoanode. The results showed that PEC inactivation was more effective to both bacterial strains than PC process, and E. coli BW25113 showed higher resistance than E. coli K-12 in both PEC and PC systems. The findings indicate that the two strains with different genes are varied in their susceptibilities and responses to the PEC and PC treatments. The h+ was found to be the major reactive species and predominantly responsible for PEC inactivation. Scanning electron microscopy images demonstrated that the cells were severely damaged and resulted in a leakage of the intracellular components during PEC inactivation process. For a given bacterial strain, no significant effect was found on the PEC inactivation efficiency as different electrolytes were employed. However, in the presence of NaCl or NaBr, PEC inactivation efficiencies of both strains were remarkably enhanced. This phenomenon can be attributed to the efficient formation of halide and dihalide radical anions during PEC process. The different efficiencies of the two bacterial strains under same conditions can be ascribed to their different abilities to resist the inactivation of bacterial strains with different genotypes.
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    Journal Title
    Applied Catalysis B: Environmental
    Volume
    147
    DOI
    https://doi.org/10.1016/j.apcatb.2013.09.037
    Subject
    Inorganic chemistry not elsewhere classified
    Physical chemistry
    Chemical engineering
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/67215
    Collection
    • Journal articles

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