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Abstract
Ag2O/TiO2 heterojunctions were prepared by a simple method, i.e., the grinding of argentous oxide with six different titania photocatalysts. The physicochemical properties of the obtained photocatalysts were characterized by diffuse-reflectance spectroscopy (DRS), X-ray powder diffraction (XRD) and scanning transmission electron microscopy (STEM) with an energy dispersive X-ray spectroscopy (EDS). The photocatalytic activity was investigated for the oxidative decomposition of acetic acid and methanol dehydrogenation under UV/vis irradiation and for the oxidative decomposition of phenol and 2-propanol under vis irradiation. Antimicrobial properties were tested for bacteria (Escherichia coli) and fungi (Candida albicans and Penicillium chrysogenum) under UV and vis irradiation and in the dark. Enhanced activity was observed under UV/vis (with synergism for fine anatase-containing samples) and vis irradiation for almost all samples. This suggests a hindered recombination of charge carriers by p-n heterojunction or Z-scheme mechanisms under UV irradiation and photo-excited electron transfer from Ag2O to TiO2 under vis irradiation. Improved antimicrobial properties were achieved, especially under vis irradiation, probably due to electrostatic attractions between the negative surface of microorganisms and the positively charged Ag2O.
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Authors (8)
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Maya Endo-Kimura
- Hokkaido University Institute for Photocatalysis
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Marcin Janczarek dr inż.
- Politechnika Poznańska, Wydział Technologii Chemicznej Instytut Technologii i Inżynierii Chemicznej
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Dong Zhang
- Hokkaido University Institute for Photocatalysis
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Kunlei Wang
- Hokkaido University Institute for Photocatalysis
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A. Markowska-Szczupak
- Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
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Ewa Kowalska
- Hokkaido University Institute for Photocatalysis
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Details
- Category:
- Articles
- Type:
- publikacja w in. zagranicznym czasopiśmie naukowym (tylko język obcy)
- Published in:
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ChemEngineering
no. 3,
pages 1 - 18,
ISSN: - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Endo-Kimura, M., Janczarek M., Bielan Z., Zhang D., Wang K., Markowska-Szczupak A., Kowalska E.. Photocatalytic and Antimicrobial Properties of Ag2O/TiO2 Heterojunction. ChemEngineering, 2019, Vol. 3, nr. 1, s.1-18
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/chemengineering3010003
- Verified by:
- Gdańsk University of Technology
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