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The effect of anatase and rutile crystallites isolated from titania P25 photocatalyst on growth of selected mould fungi

Paper ID Volume ID Publish Year Pages File Format Full-Text
30216 44465 2015 9 PDF Available
Title
The effect of anatase and rutile crystallites isolated from titania P25 photocatalyst on growth of selected mould fungi
Abstract

•Inhibition of growth of pathogenic fungi present in human environment.•Agar plate method for antifungal activity tests of titania photocatalysts.•Different activity of anatase and rutile separated from commercial titania P25.•Dependence of fungal growth on properties of titania and structure of fungi.•Different action of titania impurities in dark and light conditions on fungal growth.

Antifungal properties of anatase and rutile crystallites isolated from commercial titania P25 photocatalyst were investigated by mycelium growth in the dark and under indoor light. Investigated fungi, i.e., Pseudallescheria boydii, Scedosporium apiospermum, Pseudallescheria ellipsoidea, Scedosporium aurantiacum, Aspergillus versicolor, Aspergillus flavus, Stachybotrys chartarum, Penicillium chrysogenum, Aspergillus melleus, were isolated from air and from moisture condensed on walls. Anatase and rutile were isolated from homogenized P25 (homo-P25) by chemical dissolution, and then purified by washing and thermal treatment. For comparison, homo-P25 was also thermally treated at 200 °C and 500 °C. Titania samples were characterized by X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS) and scanning transmission electron microscopy (STEM). It was found that properties of titania, i.e., band-gap energy, impurities adsorbed on the surface, nanoparticle aggregation, and kind of fungal structure, highly influenced resultant antifungal activities. It is proposed that some fungi could uptake necessary water and nutrient from titania surface. It was also found that even when differences in mycelium growth were not significant, the sporulation and mycotoxin generation were highly inhibited by light and presence of titania.

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Keywords
Antifungal properties; Water activity; Anatase; Rutile; P25; Photocatalysis; Pathogenic fungi
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The effect of anatase and rutile crystallites isolated from titania P25 photocatalyst on growth of selected mould fungi
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 151, October 2015, Pages 54–62
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