Abstract
The present work addresses the effect of nano-silica modification on a carbon-doped titanium dioxide (C–TiO2) suspension for the development of a photocatalytic coating for indoor air improvement. The dosage effect of the applied coating and the effect of the ultraviolet pre-treatment, as an activation technique, on the photocatalytic efficiency were studied. A plug-flow experimental setup was employed for the photocatalytic efficiency assessment under realistic indoor air environment.The results showed that the nano-silica addition and the UV pre-treatment enhanced the photocatalytic efficiency of the developed coatings. The nano-silica modification was more beneficial when the coatings were applied in higher photocatalyst dosages (0.84mg·cm−2 or 1.27mg·cm−2 of C–TiO2) especially during the UV pre-treatment. The silica-modified samples tested under visible light and reduced flow rate of 1.5L·min−1 degraded up to 65% and 78% of NO (up to 43% and 60% of NOx) under initial concentration of 0.5 and 0.1ppm, respectively. Moreover, the reaction rate and reactive uptake coefficient of the developed coatings were computed.
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