Abstract
Pt nanoparticles were photocatalytically deposited onto TiO2 to improve the photocatalytic remote oxidation activity. Among the conditions examined, deposition from 1–3 mM H2PtCl6 solution for 2–10 s gave the highest activity. Further deposition resulted in reduced activities, possibly due to overgrowth of the Pt nanoparticles. The average size of the Pt nanoparticles on the optimized photocatalyst was 2.7 nm. When the most active Pt-modified TiO2 was used, it took 50 s to make an octadecyltriethoxysilane-modified glass surface superhydrophilic by the remote oxidation (light intensity was 200 mW cm−2 and the gap between the photocatalyst and the glass surface was 7.5 µm).
