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Hydroxyl Radical Scavenging-based Method for Evaluation of TiO2 Photocatalytic Activity.

التفاصيل البيبلوغرافية
العنوان: Hydroxyl Radical Scavenging-based Method for Evaluation of TiO2 Photocatalytic Activity.
المؤلفون: Pucko Mencigar, Danijela1, Strlič, Matija2, Lavrenčič Štangar, Urška3, Cerc Korošec, Romana1
المصدر: Acta Chimica Slovenica. 2013, Vol. 60 Issue 4, p908-912. 5p.
مصطلحات موضوعية: *HYDROXYL group, *FREE radical scavengers, *PHOTOCATALYSTS, *TITANIUM dioxide films, *SOL-gel processes, *SUBSTRATES (Materials science), *LIME (Minerals), *X-ray diffraction
الملخص (بالإنجليزية): A novel hydroxyl radical scavenging method was developed to establish the photocatalytic activity of TiO2 thin films. Transparent TiO2 thin films were prepared on soda-lime glass substrates using the sol-gel method and characterized using X-ray diffraction. During photoirradiation in aqueous buffered solutions, activity of the films was followed using the substituted nitrobenzene N,N'-(5-nitro-1,3-phenylene)bisglutaramide as a hydroxyl radical scavenger and its hydroxylated products were quantified using HPLC. The yield of hydroxyl radicals was evaluated at various pH of the reaction media, and reflected the dependence of the rate of the hydroxylation reaction on the experimental conditions and on the different qualities of the TiO2 thin films. The proposed method allows for direct assessment of hydroxyl radical production, it is straightforward and is proposed for routine use. [ABSTRACT FROM AUTHOR]
Abstract (Slovenian): Razvili smo metodo za določanje fotokatalitske aktivnosti Ti02 tankih plasti. V ta namen smo uporabili tanke plasti TiO2 pripravljene na steklenih nosilcih in jih predhodno okarakterizirali s pomočjo rentgenske difrakcije. Za določanje fotokatalitske aktivnosti TiO2 smo uporabili substituiran nitrobenzen N,N'-(5-nitro-1,3-fenil)bisglutaramid, ki je deloval kot lovilec hidroksilnih radikalov. Hidroksilirane produkte smo kvantificirali s HPLC. Hitrost hidroksilacije je odvisna od eksperimentalnih pogojev in vrste tankih plasti TiO2, nastanek hidroksiliranih radikalov smo vrednotili pri različnih pH vrednostih reakcijske mešanice. Predlagana metoda omogoča neposredno določitev nastalih hidroksilnih radikalov, je relativno enostavna in primerna za rutinsko uporabo. [ABSTRACT FROM AUTHOR]
قاعدة البيانات: Academic Search Index
الوصف
تدمد:13180207