Synthesis of HTaWO 6/(Pt, TiO 2) nanocomposite with high photocatalytic activities for hydrogen evolution and nitrogen monoxide destruction

Abstract

HTaWO 6/(Pt, TiO 2) nanocomposite was synthesized by successive intercalation reactions of HTaWO 6 with Pt(NH 3) 4 2+, C 3H 7NH 2/heptane mixed solution and TiO 2 acidic sol, followed by UV irradiation. The height of TiO 2 and Pt pillar is less than 0.51 nm. The host HTaWO 6 was white and possessed band gap energy of 3.11 eV, whereas the HTaWO 6/(Pt, TiO 2) nanocomposite was yellow and showed broad reflection over 400–600 nm together with that corresponding to the host layer, and possessed both excellent hydrogen evolution and nitrogen monoxide destruction photocatalytic activities even under visible light irradiation ( λ>510 nm). The HTaWO 6/(Pt, TiO 2) possessed higher photocatalytic activity than those of undoped HTaWO 6, commercial titania powder (Degussa P-25), fibrous titania and Pt-doped fibrous titania.