Characterization of Pt-TiO2 film used in three formaldehyde photocatalytic degradation systems: UV254 nm, O3+UV254 nm and UV254+185 nm via X-ray photoelectron spectroscopy

O3 byproduct can be photocatalytically decomposed on both TiO2 substrate and Pt nanoparticles under UV254+185 nm irradiation. The oxidized Pt species can trap the photogenerated electrons to increase the photocatalytic activity of Pt-TiO2.