Preparation of Pt-Doped TiO2 by Hydrothermal Method and Its Photocatalytic Performance under Visible Light Irradiation

doi:10.3724/SP.J.1088.2012.11011

Abstract

Abstract: Pt-doped TiO₂ was prepared by a hydrothermal method using nanotubular titanic acid (NTA) as the precursor. The pH values before and after the hydrothermal reaction were compared. It was found that the hydroxyl group on the surface of NTA could neutralize the chloroplatinic acid during the hydrothermal reaction, which resulted in a pH value increase. The nanotubular structure of NTA was destroyed to form nanoparticles at 130 °C accompanied by the crystal transformation from an orthorhombic system to anatase TiO₂. The X-ray photoelectroy spectroscopy results showed that platinum was present mainly in the form of Pt²⁺. The photocatalytic activity was evaluated by monitoring the oxidation of propylene under visible light irradiation. The results indicated that Pt-TiO₂ prepared at 160^oC showed the highest photocatalytic activity at visible light (λ ≥ 420 nm). The mechanism of Pt-doping into TiO₂ and the visible light sensitization of Pt-doped TiO₂ were discussed.

Key words: nanotube titanic acid, hydrothermal method, titanium dioxide, platinum doping, photocatalysis, propylene

JING Ming-Jun, WANG Yan, QIAN Jun-Jie, ZHANG Min, YANG Jian-Jun. Preparation of Pt-Doped TiO₂ by Hydrothermal Method and Its Photocatalytic Performance under Visible Light Irradiation[J]. Chinese Journal of Catalysis, 2012, 33(3): 550-556.

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Preparation of Pt-Doped TiO₂ by Hydrothermal Method and Its Photocatalytic Performance under Visible Light Irradiation

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