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مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • microwave-assisted preparation of pumpkin seed hull activated carbon and its application for the adsorptive removal of 2,4-dichlorophenoxyacetic acid

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 613
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this study explores the feasibility of pumpkin seed hull as a potential raw precursor for preparation of mesoporous activated carbon by microwave induced koh activation. the pumpkin seed hull activated carbon (pshac) was characterized by pore structural analysis, zero-point-of-charge, fourier transform infra-red spectroscopy and scanning electron microscopy. the adsorptive performance of pshac was quantified using pesticide, 2,4-dichlorophenoxyacetic acid (2,4-d) as model adsorbate. the effects of contact time, initial concentration, and solution ph on the adsorption process were evaluated. results indicated high percent of removal, with the adsorptive removal of 98.28%, 97.57%, 96.03%, 93.40%, 78.11% and 65.07% at the initial concentration 50, 100, 150, 200, 300 and 400 mg/l, respectively. kinetic studies showed that the adsorption process was well described by the pseudo-second-order kinetic model. the adsorption isotherm was analyzed using the nonlinear langmuir, freundlich and temkin isotherm models. the best fit was obtained with the temkin isotherm model, predicting a uniform distribution of binding energy over the heterogeneous surface binding sites. the maximum monolayer adsorption capacity of 2,4-d for pshac was identified to be 260.79 mg/g.

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