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Issue 6, 2007
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Visible light inactivation of bacteria and fungi by modified titanium dioxide

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Abstract

Visible light induced photocatalytic inactivation of bacteria (Escherichia coli, Staphylococcus aureus, Enterococcus faecalis) and fungi (Candida albicans, Aspergillus niger) was tested. Carbon-doped titanium dioxide and TiO2 modified with platinum(IV) chloride complexes were used as suspension or immobilised at the surface of plastic plates. A biocidal effect was observed under visible light irradiation in the case of E. coli in the presence of both photocatalysts. The platinum(IV) modified titania exhibited a higher inactivation effect, also in the absence of light. The mechanism of visible light induced photoinactivation is briefly discussed. The observed detrimental effect of photocatalysts on various microorganism groups decreases in the order: E. coli > S. aureusE. faecalisC. albicansA. niger. This sequence results most probably from differences in cell wall or cell membrane structures in these microorganisms and is not related to the ability of catalase production.

Graphical abstract: Visible light inactivation of bacteria and fungi by modified titanium dioxide

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Article information


Submitted
22 Nov 2006
Accepted
09 Mar 2007
First published
02 Apr 2007

Photochem. Photobiol. Sci., 2007,6, 642-648
Article type
Paper

Visible light inactivation of bacteria and fungi by modified titanium dioxide

D. Mitoraj, A. Jańczyk, M. Strus, H. Kisch, G. Stochel, P. B. Heczko and W. Macyk, Photochem. Photobiol. Sci., 2007, 6, 642
DOI: 10.1039/B617043A

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