title: Hydroxyl radical scavenging-based method for evaluation of TiO₂ photocatalytic activity.
abstract: 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.
authors.forename: Danijela Pucko
authors.initials: DP
authors.lastname: Mencigar
authors.forename: Matija
authors.initials: M
authors.lastname: Strlič
authors.forename: Urška Lavrenčič
authors.initials: UL
authors.lastname: Štangar
authors.forename: Romana Cerc
authors.initials: RC
authors.lastname: Korošec
mesh_terms: D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D016166:Free Radical Scavengers / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000032:analysis* / Q000528:radiation effects; D044367:Phase Transition; D010777:Photochemistry / Q000379:methods*; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology*; D014961:X-Ray Diffraction
chemical_list: D016166:Free Radical Scavengers; C009495:titanium dioxide; D017665:Hydroxyl Radical; D014025:Titanium