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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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Publication details

The article was received on 22 Nov 2006, accepted on 09 Mar 2007 and first published on 02 Apr 2007


Article type: Paper
DOI: 10.1039/B617043A
Citation: Photochem. Photobiol. Sci., 2007,6, 642-648
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    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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