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)
Year published
2013
Metadata
Show full item recordAbstract
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 ...
View more >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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View more >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
Subject
Inorganic chemistry not elsewhere classified
Physical chemistry
Chemical engineering
Environmental engineering