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Title: Enhanced inactivation of bacteria with silver-modified mesoporous TiO 2 under weak ultraviolet irradiation
Authors: Ma, J. 
Xiong, Z.
David Waite, T.
Ng, W.J.
Zhao, X.S. 
Keywords: Antibacterial activity
Fluorescence label
Silver nanoparticles
Silver-modified TiO2
Issue Date: Oct-2011
Citation: Ma, J., Xiong, Z., David Waite, T., Ng, W.J., Zhao, X.S. (2011-10). Enhanced inactivation of bacteria with silver-modified mesoporous TiO 2 under weak ultraviolet irradiation. Microporous and Mesoporous Materials 144 (1-3) : 97-104. ScholarBank@NUS Repository.
Abstract: The efficient antibacterial activity of silver-modified mesoporous TiO 2 materials with different silver contents were investigated under weak ultraviolet light (UVA) (200 μW) irradiation using Escherichia coli (E. coli) as a model strain. The comparison with the antibacterial results of three silver-modified TiO2 photocatalysts indicated that sample TiO 2-Ag2.0% with 2.0 wt.% of Ag exhibited the highest antibacterial activity with 108-109 CFU/mL E. coli being completely inactivated in 150 min. The photocatalytic destruction of E. coli cells was observed directly from field-emission scanning electron microscope and transmission electron microscope images and confirmed by using the confocal laser scanning microscopy technique, demonstrating that the surface of bacteria cells were covered by silver-modified TiO2 and the cell membrane was damaged seriously. Experimental results also revealed that an optimal amount of Ag deposited on TiO2 promise a good stability of silver-modified TiO2 materials. © 2011 Elsevier Inc. All rights reserved.
Source Title: Microporous and Mesoporous Materials
ISSN: 13871811
DOI: 10.1016/j.micromeso.2011.03.040
Appears in Collections:Staff Publications

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