Abstract: H₃PW₁₂O₄₀/TiO₂ nanometer photocatalyst was prepared by one step hydrothermal synthesis from H₃PW₁₂O₄₀·nH₂O and Ti(OBu)₄, simultaneously realizing the load and modification of H₃PW₁₂O₄₀. The catalyst was characterized by Fourier transform infrared spectroscopy(FTIR), powder X-ray diffraction(XRD), nitrogen adsorption-desorption analysis and scanning electron microscopy(SEM). The results show that the catalyst is Keggin structure and crystallized in anatase structure, the diameter and specific area of the prepared catalyst are 3.8 nm and 177.9 m²/g, respectively, and its dispersity is better. The photocatalytic properties were compared for TiO₂, H₃PW₁₂O₄₀/TiO₂ prepared by impregnation and H₃PW₁₂O₄₀/TiO₂ prepared by hydrothermal method with methyl orange as a probe. The effects of H₃PW₁₂O₄₀ loadings, crystallization method, initial pH and concentration of dye solution on the degradation of methyl orange were investigated.

Key words: H₃PW₁₂O₄₀/TiO₂, Hydrothermal synthesis, Photocatalytic performance, Degradation, Methyl orange