Photocatalytic coating for indoor air purification: Synergetic effect of photocatalyst dosage and silica modification

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 (0.84 mg·cm−2 or 1.27 mg·cm−2 of C-TiO2) especially during the UV pre-treatment. The silica-modified samples tested under visible light and reduced flow rate of 1.5 L·min−1 degraded up to 65% and 78% of NO (up to 43% and 60% of NOx) under initial concentration of 0.5 and 0.1 ppm, respectively. Moreover, the reaction rate and reactive uptake coefficient of the developed coatings were computed.