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Enhanced inactivation of Escherichia coli with Ag-coated TiO2 thin film under UV-C irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27570 44030 2011 7 PDF Available
Title
Enhanced inactivation of Escherichia coli with Ag-coated TiO2 thin film under UV-C irradiation
Abstract

The inactivation of Escherichia coli (E. coli) in water was investigated systematically with Ag-coated TiO2 thin film under UV-C irradiation. Compared with UV-C irradiation alone, the inactivation of E. coli by the UV/Ag-TiO2 process was enhanced and the photoreactivation of the bacteria was much repressed. Moreover, atomic force microscopy (AFM) measurements of E. coli showed that the presence of Ag-TiO2 thin film during UV exposure could expedite the destruction of cell wall and cell membrane, which was further confirmed by the formation of malondialdehyde (MDA) and leakage of intracellular potassium ion (K+) and protein. The results suggest that the cell structure destruction might be the major reason for the enhancement of inactivation efficiency, and the prepared Ag-TiO2 thin films show potential as a new improvement tool for UV-C disinfection.

Keywords
Ag-TiO2 thin film; Escherichia coli; Ultraviolet-C; Disinfection; Bactericidal mechanism
First Page Preview
Enhanced inactivation of Escherichia coli with Ag-coated TiO2 thin film under UV-C irradiation
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 217, Issue 1, 1 January 2011, Pages 177ā€“183
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering