Enhancement adsorption of hexavalent chromium onto modified fly ash from aqueous solution; optimization; isotherm, kinetic and thermodynamic study

Enhancement adsorption of hexavalent chromium onto modified fly ash from aqueous solution; optimization; isotherm, kinetic and thermodynamic study


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نویسندگان: کتایون جهانگیری , امین باقری

کلمات کلیدی: Chromium adsorption; isotherm and kinetic; optimization; power plant waste; surfactant-modified

نشریه: ---- عنوان نشریه در لیست موجود نیست ----, 1,1,1 - 12,2018

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کد مقاله 66016993
عنوان فارسی مقاله Enhancement adsorption of hexavalent chromium onto modified fly ash from aqueous solution; optimization; isotherm, kinetic and thermodynamic study
عنوان لاتین مقاله Enhancement adsorption of hexavalent chromium onto modified fly ash from aqueous solution; optimization; isotherm, kinetic and thermodynamic study
نوع مقاله اصیل پژوهشی - Original Article
نحوه ایندکس شدن مقاله Science Sitation Index Expanded -ISI - Web of Science
IF 1.45
عنوان نشریه ---- عنوان نشریه در لیست موجود نیست ----
نوع نشریه خارجی نمایه شده
شماره نشریه 1
دوره 1
صفحه شروع و پایان در نشریه 1 - 12
سال انتشار/ ارائه شمسی 1397
سال انتشار/ارائه میلادی 2018
آدرس لینک مقاله/ همایش در شبکه اینترنت https://www.tandfonline.com/doi/full/10.1080/01932691.2018.1496841?scroll=top&needAccess=true
ISSN 15322351, 01932691
DOI 01932691.2018.1496841
آدرس علمی (Affiliation) نویسنده متقاضی Department of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran;

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ABSTRACT Fly ash were successfully modified by a chemical method (iron and aluminum salts and surfactant) with the aim of removing Cr(VI) from aqueous solution. In this study, response surface methodology (RSM) and central composite design (CCD) were applied to improve the prediction models and optimize the chromium adsorption parameters. The results disclosed that surfactant-modified fly ash (SMF) had further influence on the fly ash. The predicted values showed that the quadratic model were in good agreement with the predicting values (high regression coefficient (R2>0.96), insignificant lack of fit (0.448), high F-value and low P-value (<0.05)). The optimized adsorption parameters were adsorbent dose of 3.53 g/L, initial Cr (VI) concentration of 35.40 mg/L; contact time of 69.32 min and pH of 2.77. The experimental data was described well with Freundlich isotherm (R2 ¼ 0. 98) and pseudo-second-order kinetic model (R2 ¼ 0. 99). The results of thermodynamic study represented that the adsorption process was spontaneous, exothermic and chemisorption (free energy (DG)¼ 30 to 40 kJ/mol and standard enthalpy (DH)¼ 41.01 kJ/mol). Therefore, cheap, ease of modification and high efficiency of fly ash has been recommended a great promise for reducing the chromium from aqueous solution.

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نویسنده نفر چندم مقاله
کتایون جهانگیریاول
امین باقریپنجم

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