غشا میکروفیلتراسیون ژئوپلیمری برپایه متاکائولن برای حذف ماده رنگزا به روش امولسیون روغنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، نفت و گاز، دانشگاه علم و صنعت ایران، تهران، ایران، کد‌پستی: ۱۳۱۱۴-۱۶۸۴۶.

2 دانشکده مهندسی شیمی، دانشگاه صنعتی امیرکبیر، تهران، ایران، صندوق‌پستی: ۴۴۱۳-۱۵۸۷۵.

3 گروه محیط زیست، پژوهشگاه رنگ، تهران، ایران، صندوق‌پستی: .654-16765.

چکیده

غشا ژئوپلیمری توسط فعال‌کردن متاکائولن با محلول حاوی مخلوط هیدروکسید سدیم و دوده سیلیس تهیه شد. غشا با استفاده از پراش پرتو ایکس، میکروسکوپ الکترونی روبشی، طیف‌سنجی تبدیل فوریه زیر قرمز، تخلخل‌سنجی نفوذ جیوه و پراکندگی انرژی پرتو ایکس مورد ارزیابی قرار گرفت. غشا ژئوپلیمری دارای تخلخل 33.5 درصد و متوسط اندازه حفره 327 نانومتر می‌باشد. از این غشا برای حذف ماده رنگزای کاتیونی متیلن آبی به روش فیلتراسیون امولسیون استفاده شد. اتصال ماده رنگزا به ماده فعال سطحی آنیونی سدیم دودسیل سولفات (SDS) و سپس انحلال آن در فاز روغنی امولسیون، باعث استخراج ماده رنگزا از محلول آبی شده که به دنبال آن گویچه‌های امولسیونی توسط غشا میکروفیلتراسیون پس زده می‌شوند. برای بهینه‌سازی عملکرد جداسازی، از روش طراحی آزمایش‌ باکس بنکن استفاده شد. نتایج نشان داد که غشا بهینه دارای بیشینه شار تراوایی l/m2.h.bar 70.28 و میزان حذف رنگرا 98.45 درصد، در سرعت جریان خوراک
l/min 1.5، غلظت SDS برابر 5.33 درصد در غلظت متیلن آبی ppm 100 می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Metakaolin-based Geopolymer Microfiltration Membrane for Removing Dye with Oil Emulsion Method

نویسندگان [English]

  • F. Oshani 1
  • R. Norouzbeigi 1
  • A. Kargari 2
  • N.M. Mahmoodi 3
1 School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, P.O. Code: 16846-13114, Tehran, Iran
2 Department of Chemical Engineering, Amirkabir University of Technology, P.O. Box: 15875-4413, Tehran, Iran
3 Department of Environmental Research, Institute for Color Science &Technology, P.O. Box: 16765-654, Tehran, Iran
چکیده [English]

Geopolymeric membranes were prepared by activating metakaolin using sodium hydroxide and silica fume solutions. The membrane was characterized using X-ray diffraction, Scanning electron microscopy, Fourier transform infrared spectroscopy, mercury intrusion porosimetry, and energy dispersion spectroscopy. The geopolymeric membrane had a porosity percentage of 33.5 and an average pore size of 327.67 nm. The cationic dye methylene blue was removed by emulsion filtration using this membrane. The dye binds to sodium dodecyl sulfate (SDS) as an anionic surfactant and then dissolves in the oil phase of the emulsion. So the dye is extracted from the aqueous solution, and the microfiltration membrane removes the emulsion droplets. The Box-Behnken experimental design was used to optimize the membrane separation performance. Results showed that the permeability was 70.28 L/m2.h.bar under the optimized conditions and a dye removal efficiency of 98.45% was achieved at a feed flow rate of 1.5 l/min, an SDS content of 5.33 %, and a methylene Blue concentration of 100 ppm.

کلیدواژه‌ها [English]

  • Geopolymer
  • Metakaolin
  • Dye Removeal
  • Membrane
  • Oil emulsion
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