• synthesis and characterization of iron-pva hydrogel microspheres and their use in the arsenic (v) removal from aqueous solution

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 524
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we adapt the sol–gel process to synthesize monodisperse metallic iron (80–155 μm), iron oxide (117–200 μm), xerogel (130–224 μm), and -pva hydrogel (300–600 μm) microspheres. according to the mössbauer analysis, iron xerogel and -pva hydrogel microspheres have superparamagnetic nanoparticles of ferrihydrite (65%) and goethite (35%). maximum arsenic (v) adsorption (87.18 mgas/g, ⩾99.40% at t ⩾ 4 h) on the iron-pva hydrogel microspheres takes place in the ph range 2–5, in accordance with the langmuir model. in this adsorption, chemisorption mechanism is predominant, but the intra-particle diffusion model suggests that the adsorption mechanism is more complex. desorption can be done with 0.011 m naoh solution, reaching an efficiency of 74.64%. our sol–gel process is effective in maintaining the iron particles monodisperse and with nanometer dimensions (⩽20 nm) inside the iron-pva hydrogel microspheres.

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