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نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • synthesis and characterization of mesoporous alumina and their performances for removing arsenic(v)

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 559
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     mesoporous alumina, synthesized by combining the three-block copolymer pluronic p123 as a template with aluminum hydroxide sol at room temperature followed by isolation and calcining, was employed as an effective adsorbent for removing arsenic(v) in the ph region of 2.5–7.0. arsenic adsorption data of ma(400) are well fitted by the langmuir isotherm model and the maximum adsorption capacity is 36.6 mg/g at near neutral (ph = 6.6 ± 0.1). calcination temperature plays an important role in determining the performance of ma(400), ma(600) and ma(800) for removing arsenic(v), and the corresponding as(v) removal is in the order of ma(400) >> ma(600) > ma(800). the kinetics data were well fitted to pseudo-second-order, which implies that “surface reaction” might be the rate limiting step. thermodynamic parameters illustrated that as(v) adsorption over ma(400) was a spontaneous and endothermic process. adsorption energy (2.61 kj/mol) is less than 8 kj/mol, indicating the adsorption process may be dominated by physisorption. the influence of coexisting anions on as(v) removal demonstrated that the removal was slightly affected by the presence of no-3 and so2-4, while the presence of sio-4, po3-4 and f- caused a sharp fall in removal effectiveness, especially when the ratio of coexisting anion concentration to as(v) was larger than 1.12.

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