Photocatalytic Activity of Pt3Ti/WO3 Photocatalyst under Visible-Light Irradiation

We have prepared Pt-Ti nanoparticles (NPs) loaded tungsten oxide (WO3) composites by hand grinding of WO3 powder with chemically prepared Pt-Ti NPs. The Pt-Ti/WO3 composites exhibited higher efficiency for the decomposition of acetic acid (AcOH) and acetaldehyde (AcH) under visible light irradiation (lambda > 420 nm) than that of the composite prepared using WO3 and the conventional cocatalyst of Pt NPs. The higher photocatalytic activity of the composites could be attributed to the efficient oxidative decomposition of organic compounds and/or reduction of O-2 on the Pt-Ti NPs surface.