Journal
CATALYSIS TODAY
Volume 151, Issue 1-2, Pages 46-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.03.043
Keywords
Terephthalic acid; TiO2 thin film; Photocatalysis; Fluorescence; Standardization
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A new method for determination of self-cleaning activity of photocatalytic surfaces is proposed. It is based on the deposition of a transparent solid layer comprising terephthalic acid over the photocatalytic surface (three types of titania films on glass were used as test samples). When such a system was irradiated, among the other degradation products also a hydroxyterephthalic acid was formed due to a reaction between photoexcited TiO2 and terephthalic acid. Hydroxyterephthalic acid is a highly fluorescent molecule and it was detected by HPLC-FLD or spectrofluorimeter. This direct method of following quantitatively the formation of an oxidation product was found to be accurate, highly sensitive and reproducible, therefore, it represents a promising option to be considered in standardization efforts in the field of photocatalysis. (C) 2010 Elsevier B.V. All rights reserved.
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