Inactivation of Pseudomonas aeruginosa by photocatalytic coatings
2011
Radeka, M., Faculty of Technical Sciences, Novi Sad (Serbia) | Markov, S., Faculty of Technology, Novi Sad (Serbia) | Lončar, E., Faculty of Technology, Novi Sad (Serbia) | Zorić, D., Faculty of Technology, Novi Sad (Serbia) | Ranogajec, J., Faculty of Technology, Novi Sad (Serbia)
The inactivation of microorganisms by TiO2 coated clay roofing tiles is primarily determined by the physical properties of the photocatalyst (structure, specific surface area, mass) substrate properties (structure, surface characteristics), ambient conditions (temperature, relative humidity, wavelength and intensity of light) and the generation of the hydroxyl radicals. The analysis focused on two photocatalytic coatings of defined physical properties, sensitive to different wavelengths (UV/VIS) and intensity of light. The photocatalytic activity was analyzed through dye degradation (methylen blue/rhodamyn B) and the inactivation of microorganism (Pseudomonas aeruginosa). The coating effective under the UV lights was prepared by mixing 2.5 mass % TiO2 aqueous (deionised water), colloidal dispersion (VP Disp.W 2730 X, Degussa, Frankfurt, Germany) and PEG with molecular weight of 600 (Baker, Germany). The spray technique and thermal treatment (drying for 30 min at 25 deg C and 50% RH, heating at 290 deg C for 30 minutes) were used in order to obtain the coating with a mesoporous structure (0.885 mg/ square cm TiO2). The second coating, effective under the visible light, (0.109 mg/ square cm), was obtained through a nano-hydrosynthetic process. It was fixed to the tile surface by a drying process (30 deg C during 30 min). Since the capability of microorganisms to be attached to the coating surface is influenced by the characteristics of the substrate, a detailed characterization of the used tile surfaces was done. The obtained results were coupled with the values of the contact angle, water activity and microorganisms inactivation.
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