Evaluation of the photocatalytic activity of the FN1® coating on ignimbrite (sillar) in Arequipa - Peru
DOI:
https://doi.org/10.5377/nrc.v37i01.18322Keywords:
Photocatalytic Materials, TiO2, IgnimbriteAbstract
The photocatalytic activity of a suspension of commercial titanium dioxide (FN1), deposited on a porous ignimbrite stone, widely used as a construction material in Arequipa-Peru, was evaluated in order to generate surfaces with self-cleaning properties in urban buildings. The suspension was applied on one side of the ignimbrite substrate by two methods: spray-coating and brush-coating. To evaluate that its application does not alter the physical aspect of the ignimbrite substrate surface, the color coordinates were determined by the CieL*a*b* method, after the application of FN1 giving a maximum total variation of 2.49, showing a good visual compatibility of the coating with the ignimbrite surface. The photocatalytic activity was evaluated by using photobleaching tests with the dyes 2,6-dichloroindophenol (DCIP) and methylene blue (AM), under simulated sunlight irradiation. The highest photocatalytic efficiency was obtained with the ignimbrite substrate coated with 3 layers by spraying FN1, which showed a photodegradation of AM and DCIP of 75.07% and 100% at 120 min and 5 min of irradiation, respectively.
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