Development of a fluorescence-based method for evaluation of self-cleaning properties of photocatalytic layers

被引:47
作者
Cernigoj, Urh [1 ]
Kete, Marko [1 ]
Stangar, Urska Lavrencic [1 ]
机构
[1] Univ Nova Gorica, Environm Res Lab, SI-5001 Nova Gorica, Slovenia
关键词
Terephthalic acid; TiO2 thin film; Photocatalysis; Fluorescence; Standardization; RADICAL FORMATION; PILKINGTON ACTIV(TM); TIO2; ACID; DEGRADATION; REACTIVITY; OXIDATION; FILMS;
D O I
10.1016/j.cattod.2010.03.043
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
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.
引用
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页码:46 / 52
页数:7
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