• novel photocatalyst, bi2sn2o7, for photooxidation of as(iii) under visible-light irradiation

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1010
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     nanocrystalline bi2sn2o7, a visible-light photocatalyst synthesized via a facile hydrothermal route, is used to remove arsenite from aqueous solution for the first time. the as-synthesized bi2sn2o7 product is characterized by x-ray diffraction, n2 sorption–desorption, uv–vis diffuse reflectance spectroscopy, transmission electron microscopy, electron spin resonance, x-ray photoelectron spectra, and electrochemistry technology. the results reveal that the sample has an average particle size of approximately 10 nm, a specific surface area of 51.3 m2/g, and a band gap of 2.88 ev. moreover, the bi2sn2o7 nanoparticles exhibit a high photocatalytic activity in the oxidation of as(iii) (up to 96.8%) under visible-light irradiation. radical doto2 and h+ are recognized as the primary active species responsible for as(iii) oxidation. meanwhile, a possible mechanism for the photo-oxidation of as(iii) over bi2sn2o7 is also proposed.

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