The mechanisms of photocatalytic remote oxidation have been elucidated. Hydrogen peroxide, generated on a photocatalyst (TiO2, Pt-TiO2, or Ag-TiO2), is transported in air and then photocleaved into hydroxyl radicals by UV light in the vicinity of a substrate, and the hydroxyl radicals attack the substrate.
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Kubo et al. (2006) studied this question.