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Photo-adsorption and photo-desorption of oxygen on highly hydroxylated TiO2 surfaces. Part 2.—Study of radical intermediates by electron paramagnetic resonance
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1979
Year
EngineeringInorganic PhotochemistryPretreatment TemperatureChemistryPhotoelectrochemistryChemical EngineeringHydrated SamplesElectron Paramagnetic ResonancePhotocatalysisMaterials SciencePhotochemistryDifferent Oxygen SpeciesPhysical ChemistryRadical IntermediatesHydrogenPhotodegradationTio2 SurfacesTitanium Dioxide MaterialsChemical Kinetics
The effect of pretreatment temperature on the u.v. photo-adsorption of O2 on TiO2 has been studied by e.p.r. Different oxygen species are found if the sample is completely hydroxylated or strongly dehydroxylated, this being related to two different photo-adsorption mechanisms. O2H· and V-centres are found for the hydrated samples and O–2, O–3 O3–3 for the dehydroxylated samples. The origin of all these species is discussed.