• synthesis and photocatalytic properties of nanocrystalline au, pd and pt photodeposited onto mesoporous ruo2-tio2 nanocomposites

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1311
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     noble metals (au, pd and pt) have been photodeposited onto hexagonal mesoporous ruo2-tio2nanocomposites to study their influence on the photocatalytic activity under uv and visible lights by determination of the formation rate of hcho generated by photooxidation of ch3oh in aqueous solution. x-ray diffraction (xrd) patterns and n2 sorption isotherms reveal that highly crystalline tio2 and mesoporous structure have been formed with high surface area (150–180 m2/g) and pore diameter ranging from 6.8 to 7.3 nm. tem measurements show that the framework of the highly crystalline mesoporous ruo2-tio2 is composed of anatase phase grown along [1 0 1] direction. the dependence of hcho formation rate on the noble metals/ruo2-tio2 nanocomposites, behaves quite differently depending on noble metals as electrons sink. under uv light, the findings reveal that pd/ruo2-tio2 offers an improvement in term photooxidation rate of ch3oh and photonic efficiencies over pt/ruo2-tio2 and au/ruo2-tio2. however, under visible light, the photocatalytic activity of mesoporous ruo2-tio2 containing au nanoparticles towards ch3oh oxidation is remarkable and the photonic efficiency of ruo2-tio2 has been improved two times. pt and pd nanoparticles could not be observed in any improvement in photocatalytic activity of ruo2-tio2 under visible light.

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