Photocatalysis of dinitrotoluene decomposition by H3PW12O40/TiO2 and H4SiW12O40/TiO2 prepared by a modified sol-gel synthesis and solvothermal treatment method

doi:10.1016/S1872-2067(12)60736-0

Abstract

Abstract:

Mesoporous H₃PW₁₂O₄₀/TiO₂ and H₄SiW₁₂O₄₀/TiO₂ were synthesized by combining sol-gel technology using a nonionic surfactant P123 as a structure directing agent with solvothermal treatment. X-ray diffraction and Raman spectroscopy results indicated that the TiO₂ particles had the anatase phase, and the primary Keggin structures of H₃PW₁₂O₄₀ and H₄SiW₁₂O₄₀ remained intact after calcination at 400 ℃. N₂ adsorption-desorption analysis and scanning electron microscopy showed that the specific surface area and pore volume were increased by the addition of P123. The specific surface area of H₃PW₁₂O₄₀/TiO₂ and H₄SiW₁₂O₄₀/TiO₂ increased to 252.2 and 250.0 m²/g, respectively. Ultraviolet-visible absorption spectroscopy showed that compared with pure TiO₂, an obvious red shift occurred and the absorption intensity was increased for the composite catalysts. The catalysts were tested and the degradation rate of dinitrotoluene was as high as 95% under the optimum conditions.

Key words: Mesoporous material, Polyoxometalate, Titanium dioxide, Structure directing agent, Dinitrotoluene, Photocatalytic degradation

Changgen Feng, Hairu Shang, Xia Liu. Photocatalysis of dinitrotoluene decomposition by H₃PW₁₂O₄₀/TiO₂ and H₄SiW₁₂O₄₀/TiO₂ prepared by a modified sol-gel synthesis and solvothermal treatment method[J]. Chinese Journal of Catalysis, 2014, 35(2): 168-174.

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Photocatalysis of dinitrotoluene decomposition by H₃PW₁₂O₄₀/TiO₂ and H₄SiW₁₂O₄₀/TiO₂ prepared by a modified sol-gel synthesis and solvothermal treatment method

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