Mechanistic study of the visible-light-driven photocatalytic inactivation of bacteria by graphene oxide-zinc oxide composite
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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 center dot 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. (C) 2015 Elsevier B.V. All rights reserved.
All Author(s) ListWu D, An TC, Li GY, Wang W, Cai YC, Yip HY, Zhao HJ, Wong PK
Name of Conference1st International Workshop on Graphene and C3N4-based Photocatalysts (IWGCP)
Start Date of Conference05/06/2015
End Date of Conference08/06/2015
Place of ConferenceWuhan
Journal nameApplied Surface Science
Volume Number358
Pages137 - 145
LanguagesEnglish-United Kingdom
KeywordsBacterial inactivation; Graphene oxide-zinc oxide composite; Photosensitizing mechanism; Visible light driven photocatalyst
Web of Science Subject CategoriesChemistry; Chemistry, Physical; Materials Science; Materials Science, Coatings & Films; Physics; Physics, Applied; Physics, Condensed Matter

Last updated on 2021-12-10 at 00:25