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Silver-modified titania with enhanced photocatalytic and antimicrobial properties under UV and visible light irradiation
Abstract
Commercial titania photocatalysts were modified with 2 wt% of silver by photodeposition. The properties of the samples were characterized by DRS, XPS, XRD, FE-SEM and STEM. The modified samples exhibited activity under visible light and enhanced activity under UV irradiation for 2-propanol and acetic acid oxidation, respectively. The time-resolved microwave conductivity (TRMC) analysis indicated that enhanced activity (2.5–8-fold enhancement depending on titania) under UV irradiation was caused by an electron storage in metallic nanoparticles (NPs), and therefore decreasing the recombination between charge carriers. The action spectrum (AS) analysis proved that localized surface plasmon resonance (LSPR) of silver NPs induced the photocatalytic activity under visible light irradiation. The increase of antimicrobial properties under visible light irradiation indicated that not only intrinsic properties of silver in the dark, but also plasmonic properties of Ag@TiO2 were responsible for overall bacteria killing. The evolution of carbon dioxide under both irradiation ranges indicated mineralization of bacteria cells, and therefore possible application of silver-modified titania for decomposition of chemical and biological pollutants.
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Authors (10)
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E. Kowalska
- Hakkaido University Catalysis Resarch Center
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Z. Wei
- Hakkaido University Catalysis Resarch Center
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B. Karabiyik
- Hakkaido University Catalysis Resarch Center
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A. Herissan
- Universite de Paris-Sud Laboratoire de Chemie Physique
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M. Endo
- Hakkaido University Catalysis Resarch Center
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A. Markowska-Szczupak
- Hakkaido University Catalysis Resarch Center
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H. Remita
- Universite de Paris-Sud Laboratoire de Chemie Physique
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B. Ohtani
- Hakkaido University Catalysis Resarch Center
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.cattod.2014.10.038
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
CATALYSIS TODAY
no. 252,
pages 136 - 142,
ISSN: 0920-5861 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Kowalska E., Wei Z., Karabiyik B., Herissan A., Janczarek M., Endo M., Markowska-Szczupak A., Remita H., Ohtani B.: Silver-modified titania with enhanced photocatalytic and antimicrobial properties under UV and visible light irradiation// CATALYSIS TODAY. -Vol. 252, (2015), s.136-142
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.cattod.2014.10.038
- Verified by:
- Gdańsk University of Technology
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