• mesoporous i-ag codoped titania and alumina modified titania catalysts: synthesis, characterization and photocatalytic properties

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1113
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     mesoporous iodine and silver codoped titania and alumina modified titania photocatalysts were synthesized by a two-step surfactant-templated hydrothermal route and characterized by x-ray diffraction, xps, uv–visible diffuse reflectance spectroscopy and nitrogen adsorption. the mesoporous materials had surface areas of 2.6–5.3 times that of degussa p25. the i-ag codoped mesoporous titania samples exhibited a bicrystalline framework of rutile and anatase with rutile fractions of 23% and 26%, respectively, whereas the alumina-containing i-ag codoped materials yielded anatase as the only crystalline phase. the i-ag codoped photocatalysts with ag/ti mole ratio of 1.6% and 2.0% showed catalytic activity 3.3 times and 12 times higher than degussa p25 under halogen visible and visible light (>400 nm) in photodecomposing methyl orange, respectively. the high performance of i-ag codoped titania and alumina modified titania photocatalysts under visible light is attributed to the combined effects of large surface area, lower band gap energies and mesoporous structure.

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