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Determination of the photocatalytic efficiency of TiO2 coatings on ceramic tiles by monitoring the photodegradation of organic dyes
Petrovič Šenk, Vladimira ; Ducman, Vilma ; Škapin, Srečo D.
A method for the evaluation of the photocatalytic effectiveness of nanotitaniacoatings on ceramic substrate was established. Decolourization of three organic dyes, including methylene blue (MB), ...rhodamine B (RB) and crystal violet (CV), was investigated under different experimental conditions.The results showed that the UV light spectrum and light intensity are important parameters when establishing this method. The effect of TiO2 onthe percentage degradation of the dyes was examined by varying its concentration in the suspensions between 0.1% - 4.5 wt %, which resulted in different thicknesses of the TiO2 layers, and as expected higher percentages of nanotitania resulted in higher photocatalytic efficiencies. However higher amounts of titania lead to the formation of cracks on the surface, which mightdetrimentally affect adhesion and thus also long-term durability. The applicability of all the dyes used in the present study was proved, and there is good correlation between MB, RB and CV in the evaluation of self-cleaning efficiency.
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