Antibacterial activity of thin-film photocatalysts based on metal- modified TiO sub(2) and TiO sub(2):In sub(2)O sub(3) nanocomposite

Photoinduced bactericidal activity of nanostructured TiO sub(2) and TiO sub(2):In sub(2)O sub(3) films and the effect of deposition of silver and bimetallic Ag/Ni nanoparticles on the pathophysiological properties of titania films were investigated. The antimicrobic activity of the films was assesse...

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Published in:Applied catalysis. B, Environmental Environmental, 2008-10, Vol.84 (1-2), p.94-99
Main Authors: Skorb, E V, Antonouskaya, LI, Belyasova, NA, Shchukin, D G, Moehwald, H, Sviridov, D V
Format: Article
Language:English
Subjects:
Lactococcus lactis
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Summary:Photoinduced bactericidal activity of nanostructured TiO sub(2) and TiO sub(2):In sub(2)O sub(3) films and the effect of deposition of silver and bimetallic Ag/Ni nanoparticles on the pathophysiological properties of titania films were investigated. The antimicrobic activity of the films was assessed against Psedomonas fluorescens B-22 (gram-negative bacterium) and Lactococcus lactis ssp. lactis 411 (gram-positive bacterium). The silver-modified TiO sub(2) film demonstrates the highest photobiocide efficiency, enhancing the bactericidal activity of UV light ca. 71-fold, that results from radical improvement of microorganism adsorption and suppression of recombination of photoproduced charge carriers. Higher inactivation rate observed for P. fluorescens as compared to L. lactis can be explained in terms of comparative morphologies of the cell envelops of gram-negative and gram-positive microorganisms and the resistance of their outer membranes to the reactive oxygen species generated by photocatalytic reactions.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2008.03.007