| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 39646 | Applied Catalysis A: General | 2014 | 9 Pages |
•Paint coatings are 3D supports for photocatalysts.•These 3D supports enhance light absorption and enable higher superficial area.•Pigmentary TiO2 blocks light harvesting, decreasing the photocatalytic activity.•The best performing paint was formulated with PC500 and calcium carbonate.•The best paint formulation presents a NO conversion of 95% under outdoor tests.
In this work the photocatalytic activity of paints incorporating commercial titanium dioxide for outdoor nitrogen oxide (NO) photoabatement is assessed. The paint acts as a 3D support of the photocatalyst and thus allows a larger amount of TiO2 nanoparticles to absorb light and to contact with pollutants, when compared with a 2D photocatalytic surface. NO conversion and selectivity towards nitrites and nitrates were determined according to the standard ISO 22197-1:2007 (E). Paint coatings were formulated and tested under laboratory and outdoor conditions. The best paint formulation incorporates CristalACTiV™ PC500 photocatalyst from Cristal and calcium carbonate extender, presenting a NO conversion of ca. 70% and a selectivity of ca. 40% under laboratory conditions. The same photocatalyst but characterized in the form of an optically thick film of compressed powder presented ca. 95% and 45% of conversion and selectivity, respectively. Under the real-outdoor conditions, the best performing paint showed a NO conversion of about 95%.
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