Development of a wall covering for indoor air purification : design, characterization and photocatalytic efficiency assessment

Abstract in teks

Design and performance evaluation of the functional coating for air purification under indoor conditions

The present work aims to develop a photocatalytic coating for the improvement of indoor air quality. Two types of visible-light responsive photocatalysts (powder and suspension form) were applied into a water-based acrylic coating. The applied materials were characterized and the developed coatings were tested for the pollutant removal efficiency under visible-light irradiation. The coatings containing a stabilized C-TiO2 suspension showed nano-scale and uniform particle distributions. UV treatment was found to be necessary, in order to expose the nano-photocatalytic particle and to promote the NOx removal efficiency under visible light irradiation, from 5 hours (5% de-NOx) to 24 hours (23% de-NOx). In addition, the distribution and the incorporation of the catalyst were significantly improved in case of the coatings incorporating C-TiO2 suspension

Design and performance evaluation of the functional coating for air purification under indoor conditions

The present work aims to develop a photocatalytic coating for the improvement of indoor air quality. Two types of visible-light responsive photocatalysts (powder and suspension form) were applied into a water-based acrylic coating. The applied materials were characterized and the developed coatings were tested for the pollutant removal efficiency under visible-light irradiation. The coatings containing a stabilized C-TiO2 suspension showed nano-scale and uniform particle distributions. UV treatment was found to be necessary, in order to expose the nano-photocatalytic particle and to promote the NOx removal efficiency under visible light irradiation, from 5 hours (5% de-NOx) to 24 hours (23% de-NOx). In addition, the distribution and the incorporation of the catalyst were significantly improved in case of the coatings incorporating C-TiO2 suspension

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

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 (0.84 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 compute