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نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
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  • pb(ii) removal of fe3o4@sio2–nh2 core–shell nanomaterials prepared via a controllable sol–gel process

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 639
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     contamination of natural water with heavy metals (especially lead ions) is a problem of major concern and thus great demand of effective adsorbents for removal of toxic ions is increasing. due to the task-specific properties of amino groups, core–shell nanostructures of fe3o4@sio2–nh2 have been extensively investigated as advanced adsorbents; however, most studies on surface modification of fe3o4@sio2 substances were of environmentally inefficient grafting methods. herein, we demonstrated that mono-dispersed and spherical fe3o4@sio2–nh2 nanomaterials can be facilely prepared by co-condensation of teos with aptms employing a green sol–gel process. the as-prepared fe3o4@sio2–nh2 magnetic nanoparticles (mnps) prepared under optimum conditions possessing uniform core–shell structure (∼200 nm in diameter), relatively high loading of amino-functionality (∼5.45 wt%), easy recovery by external magnet and effective removal of pb(ii) (qm = 243.9 mg/g, 25 °c). the adsorption was shown to be effective and a higher temperature was more favorable for the adsorption. the adsorption equilibrium data obeyed the langmuir model and the kinetic data were well fitted to the pseudo-second-order model. thermodynamic studies revealed the feasibility and endothermic nature of the system. these results demonstrated that the sol–gel produced fe3o4@sio2–nh2, due to its easy synthesis and recovery and eco-friendliness, can be a potential adsorbent for pb(ii) removal.

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