Facile fabrication of Ag/C-TiO 2 nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis
This work aimed to investigate the promotive effect of Ag modification on C-TiO2 for visible light photocatalytic disinfection of microorganisms. Ag/C-TiO2 was prepared by a facile one-step synthesis approach through thermal oxidation of AgNO3-impregnated TiC precursor. The self-doped carbon exists...
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sg-ntu-dr.10356-838502020-03-07T14:02:43Z Facile fabrication of Ag/C-TiO 2 nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis Zhang, Li Han, Mandi Tan, Ooi Kiang Tse, Man Siu Wang, Yu Xi Sze, Chun Chau School of Electrical and Electronic Engineering School of Biological Sciences Escherichia coli Photocatalytic disinfections This work aimed to investigate the promotive effect of Ag modification on C-TiO2 for visible light photocatalytic disinfection of microorganisms. Ag/C-TiO2 was prepared by a facile one-step synthesis approach through thermal oxidation of AgNO3-impregnated TiC precursor. The self-doped carbon exists as both interstitial and substitutional carbon to collectively enhance the visible light photocatalytic absorption. The loaded silver nanoparticles were uniformly distributed on the TiO2 surface in the Ag0 metallic state, further enhancing the visible light absorption due to surface plasmon resonance yet inhibiting the charge carrier recombination by conduction band electron trapping. The band structure and a tentative visible light photocatalytic disinfection mechanism of Ag/C-TiO2 with four pathways were thus proposed, and the enhanced visible light photocatalytic performance was demonstrated for disinfection of Escherichia coli (E. coli) and Enterococcus faecalis (E. faecalis) in comparison with C-TiO2. This improvement was more pronounced with increasing Ag loading in the range of 0.5–5.0 wt%, which can be attributed to the improved visible light absorption and good charge carrier separation due to Ag modification as well as to the inherent bactericidal effect of metallic Ag. ASTAR (Agency for Sci., Tech. and Research, S’pore) 2016-09-23T02:12:54Z 2019-12-06T15:33:11Z 2016-09-23T02:12:54Z 2019-12-06T15:33:11Z 2013 Journal Article Zhang, L., Han, M., Tan, O. K., Tse, M. S., Wang, Y. X.,& Sze, C. C. (2013). Facile fabrication of Ag/C-TiO 2 nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis . J. Mater. Chem. B, 1(4), 564-570. https://hdl.handle.net/10356/83850 http://hdl.handle.net/10220/41480 10.1039/C2TB00113F en J. Mater. Chem. B © Royal Society of Chemistry 2016. |
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Escherichia coli Photocatalytic disinfections Zhang, Li Han, Mandi Tan, Ooi Kiang Tse, Man Siu Wang, Yu Xi Sze, Chun Chau Facile fabrication of Ag/C-TiO 2 nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
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This work aimed to investigate the promotive effect of Ag modification on C-TiO2 for visible light photocatalytic disinfection of microorganisms. Ag/C-TiO2 was prepared by a facile one-step synthesis approach through thermal oxidation of AgNO3-impregnated TiC precursor. The self-doped carbon exists as both interstitial and substitutional carbon to collectively enhance the visible light photocatalytic absorption. The loaded silver nanoparticles were uniformly distributed on the TiO2 surface in the Ag0 metallic state, further enhancing the visible light absorption due to surface plasmon resonance yet inhibiting the charge carrier recombination by conduction band electron trapping. The band structure and a tentative visible light photocatalytic disinfection mechanism of Ag/C-TiO2 with four pathways were thus proposed, and the enhanced visible light photocatalytic performance was demonstrated for disinfection of Escherichia coli (E. coli) and Enterococcus faecalis (E. faecalis) in comparison with C-TiO2. This improvement was more pronounced with increasing Ag loading in the range of 0.5–5.0 wt%, which can be attributed to the improved visible light absorption and good charge carrier separation due to Ag modification as well as to the inherent bactericidal effect of metallic Ag. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Zhang, Li Han, Mandi Tan, Ooi Kiang Tse, Man Siu Wang, Yu Xi Sze, Chun Chau |
format |
Article |
author |
Zhang, Li Han, Mandi Tan, Ooi Kiang Tse, Man Siu Wang, Yu Xi Sze, Chun Chau |
author_sort |
Zhang, Li |
title |
Facile fabrication of Ag/C-TiO
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
title_short |
Facile fabrication of Ag/C-TiO
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
title_full |
Facile fabrication of Ag/C-TiO
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
title_fullStr |
Facile fabrication of Ag/C-TiO
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
title_full_unstemmed |
Facile fabrication of Ag/C-TiO
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of Escherichia coli and Enterococcus faecalis |
title_sort |
facile fabrication of ag/c-tio
2
nanoparticles with enhanced visible light photocatalytic activity for disinfection of escherichia coli and enterococcus faecalis |
publishDate |
2016 |
url |
https://hdl.handle.net/10356/83850 http://hdl.handle.net/10220/41480 |
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1681038467828547584 |