Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 144, Issue 1-3, Pages 97-104Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2011.03.040
Keywords
Silver-modified TiO2; Antibacterial activity; Silver nanoparticles; Bacteria; Fluorescence label
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The efficient antibacterial activity of silver-modified mesoporous TiO2 materials with different silver contents were investigated under weak ultraviolet light (UVA) (200 mu W) 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 TiO2-Ag2.0% with 2.0 wt.% of Ag exhibited the highest antibacterial activity with 10(8)-10(9) 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. (C) 2011 Elsevier Inc. All rights reserved.
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