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ACS Appl Mater Interfaces. 2014 Jan 8;6(1):545-52. doi: 10.1021/am4046074. Epub 2013 Dec 20.

Assessment of the activity of photocatalytic paint using a simple smart ink designed for high activity surfaces.

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  • 1School of Chemistry and Chemical Engineering, Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, United Kingdom.


The use of an acid violet 7 (AV7) smart ink to assess the activity of photocatalytic paint is demonstrated. A linear correlation is established between the change in oxidized dye concentration, as measured by diffuse reflectance, and the change in the green component of the RGB color values, obtained using a portable hand-held scanner, suggesting that such tests can be monitored easily using an inexpensive piece of hand-held office equipment, as opposed to an expensive lab-based instrument, such as a diffuse reflectance UV/vis spectrophotometer. The bleaching of the AV7 follows first order kinetics, at a rate that is linearly dependent upon the UVA irradiance (0.30-3.26 mW cm(-2)). A comparison of relative rate of bleaching of the AV7 ink with the relative rate of removal of NOx, as determined using the ISO test (ISO 22197-1:2007), established a linear relationship between the two sets of results and the relevance of this correlation is discussed briefly.

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