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Inactivation of Escherichia coli on immobilized TiO2 using fluorescent light

Paper ID Volume ID Publish Year Pages File Format Full-Text
28263 44067 2009 7 PDF Available
Title
Inactivation of Escherichia coli on immobilized TiO2 using fluorescent light
Abstract

There are many circumstances where it is necessary or desirable to remove or to kill microorganisms found on surfaces. In this paper, we present evidence of the photocatalytic inactivation of Escherichia coli (ATCC8739) cells deposited on TiO2 loaded membrane filters during irradiation with fluorescent light. The TiO2 selected was the photocatalyst PC105, with loadings ranging from 520 to 15,590 mg m−2. Irradiation was produced by eight 8 W lamps with visible light, and UV (290–400 nm) at 0.05–0.12 W m−2 intensity. E. coli inactivation as a function of time was monitored for up to 120 min. In the presence of fluorescent light, the inactivation rate of E. coli increased with a decrease in the TiO2 loading, giving the best results at 520 mg m−2 loading, with complete inactivation achieved after 2 h of exposure. TiO2 loading higher than 6236 mg m−2 resulted in decreased inactivation. SEM images of photocatalyst and bacteria show that increasing the particle contact with the bacteria enhanced the disinfection process. Thus excess TiO2 did not enhance the antibacterial effect, once maximum cell–photocatalyst contact had been achieved.

Keywords
Photocatalysis; TiO2; UV inactivation; E. coli; Fluorescent light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 202, Issues 2–3, 25 February 2009, Pages 92–98
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us