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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • facile synthesis of silver-deposited silanized magnetite nanoparticles and their application for catalytic reduction of nitrophenols

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1062
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we have demonstrated a facile fabrication of silver-deposited silanized magnetite (fe3o4/sio2@ag) beads, along with their catalytic performance in the reduction of nitrophenols. initially, 283 ± 40 nm sized spherical magnetite (fe3o4) particles composed of ∼13 nm superparamagnetic nanoparticles were synthesized, and then they were silanized following the modified stöber method. silica-coated magnetic (fe3o4/sio2) nanoparticles are then resistant to oxidation and coagulation. in order to deposit silver onto them, fe3o4/sio2 nanoparticles were dispersed in a reaction mixture consisting of ethanolic agno3 and butylamine. with this simple and surfactant-free fabrication method, we can avoid any contamination that might make the fe3o4/sio2@ag particles unsuitable for catalytic applications. the as-prepared fe3o4/sio2@ag particles were accordingly used as solid phase catalysts for the reduction of 4-nitrophenol (4-np) in the presence of sodium borohydride. the reduction of other nitrophenols such as 2-nitrophenol (2-np) and 3-nitrophenol (3-np) were also tested using the fe3o4/sio2@ag nanoparticles as catalysts, and their rate of reduction has been found to follow the sequence, 4-np>2-np>3-np. the fe3o4/sio2@ag particles could be separated from the product using an external magnet and be recycled a number of times after the quantitative reduction of nitrophenols.

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