Mechanistic study of the visible-light-driven photocatalytic inactivation of bacteria by graphene oxide-zinc oxide composite
Refereed conference paper presented and published in conference proceedings


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AbstractThe visible-light-driven (VLD) photocatalytic activity of graphene oxide-zinc oxide (GO-ZnO) composite prepared by a simple hydrothermal method was evaluated toward the inactivation of Escherichia coli K-12. The results showed that GO-ZnO composite had excellent VLD photocatalytic bacterial inactivation activity, comparing with those of ZnO and GO, which was attributed to the strong interaction between ZnO and GO in the composite. Accordingly, an interaction induced VLD photocatalytic inactivation mechanism of the strong interaction of GO with ZnO within the GO-ZnO composite was proposed. GO served as a photosensitizer and facilitated the charge separation and transfer, thus boosted the massive production of reactive oxygen species such as OHbulk, which was identified as the major reactive species from conduction band of ZnO, and resulted in a remarkable enhancement of bacterial inactivation efficiency. Moreover, GO-ZnO composite showed obviously superior photocatalytic bacterial inactivation within 10 min under natural solar light irradiation, indicating that GO-ZnO composite has great potential in wastewater treatment and environmental protection.
All Author(s) ListWu D., An T., Li G., Wang W., Cai Y., Yip H.Y., Zhao H., Wong P.K.
Journal nameApplied Surface Science
Detailed descriptionorganized by Wuhan University of technology,
Year2015
Month12
Day15
Volume Number358
PublisherElsevier BV
Place of PublicationNetherlands
Pages137 - 145
ISSN0169-4332
eISSN1873-5584
LanguagesEnglish-United Kingdom
KeywordsBacterial inactivation, Graphene oxide-zinc oxide composite, Photosensitizing mechanism, Visible-light-driven photocatalyst

Last updated on 2021-03-05 at 23:46