Journal
CHINESE JOURNAL OF CATALYSIS
Volume 41, Issue 10, Pages 1488-1497Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(19)63409-1
Keywords
Photocatalysis; WO3; Microwave; Oxygen vacancy; Bacterial inactivation
Funding
- National Natural Science Foundation of China [21607028, 41425015, 41573086]
- Research Grant Council of Hong Kong SAR Government [GRF14100115]
- Science and Technology Project of Guangdong Province [2017A050506049]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z032]
- Innovation Team Project of Guangdong Provincial Department of Education [2017KCXTD012]
- Leading Scientific, Technical and Innovation Talents of Guangdong Special Support Program [2016TX03Z094]
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Surface defect modulation has emerged as a potential strategy for promoting the photocatalytic activity of photocatalysts for various applications, while the impact of the oxygen vacancy on bacterial inactivation is still debated. In this study, oxygen vacancies were introduced to tungsten trioxide nanosheets (WO3-x) via a microwave-assisted route. The as-prepared WO3-x nanosheets exhibited excellent visible-light-driven photocatalytic activity toward E. coli K-12 inactivation, and 6 log orders of the bacterial cells could be completely inactivated within 150 min. The obtained bacterial inactivation rate constant was 15.2 times higher than that of pristine WO3 without oxygen vacancies, suggesting that the surface oxygen vacancy could significantly promote the bacterial inactivation efficiency. The mechanism study indicated that the inactivation of bacterial cells occurs via a direct h(+) oxidation pathway. In addition, the role of the oxygen vacancy was studied in detail; the oxygen vacancy was found to not only promote interfacial charge separation but also tune the band structure of WO3, thereby leading to increased h+ oxidation power. Finally, a possible oxygen vacancy-dominated photocatalytic bacterial inactivation mechanism is proposed. This work is expected to offer new insights into the microwave-assisted synthesis of defective photocatalysts and the use of the oxygen vacancy for promoting photocatalytic antibacterial activities. (c) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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