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Antimicrobial activity of Fe–TiO2 thin film photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
27376 44018 2011 7 PDF Available
Title
Antimicrobial activity of Fe–TiO2 thin film photocatalysts
Abstract

Fe–TiO2 sol–gel thin film photocatalysts were prepared by the spin-coating method. Precursory Fe–TiO2 films, containing 3 and 5 wt.% Fe, were thermally treated at 400 and 800 °C; the dominant crystalline phases of TiO2 were anatase and rutile, respectively. The thin films were characterized by X-ray diffraction, UV–vis spectroscopy, and scanning electron microscopy. The antimicrobial photocatalytic activity over colonies of Escherichia coli bacteria, deposited on the thin films and induced by the incidence of visible radiation was evaluated by the plate counting method. The thin film containing 5 wt.% Fe and treated at 800 °C had a microcrystalline texture and could eliminate E. coli bacteria completely after 60 min. In these materials the active phases are both anatase and rutile.

Graphical abstractEscherichia coli photocatalytic water disinfection treatment is possible under visible-light irradiation on Fe-doped TiO2 thin films (a, b), deposited on sodium glass. The energy band gap of doped TiO2 moves to a lower energy if compared to pristine TiO2. In this system, rutile is also an active phase for electron photoemission.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Fe–TiO2 thin film effective photocatalytic elimination activity over Escherichia coli bacteria. ► Visible-light required for rutile and anatase TiO2 thin film photoactivation. ► Thin film textural properties suitable for bacterial adherence to the surface. ► 5 wt.% Fe TiO2 thin film eliminates Escherichia coli bacteria completely in 1 h.

Keywords
Fe–TiO2 sol–gel photocatalyst; Escherichia Coli; TiO2 thin films; Sol–gel; Anatase; Rutile; Visible radiation
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Antimicrobial activity of Fe–TiO2 thin film photocatalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 222, Issue 1, 5 July 2011, Pages 159–165
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