ساخت و بررسی عملکرد جداسازی و خواص ضدگرفتگی غشای نانوفیلتری ماتریس ترکیبی بر پایه پلی‌اتر سولفون دارای نانوذرات کبالت فریت

نوع مقاله : پژوهشی

نویسندگان

اراک، دانشگاه اراک، دانشکده فنی و مهندسی، گروه مهندسی شیمی، کد پستی 8349-8-138156

10.22063/jipst.2020.1762

چکیده

فرضیه: در این مطالعه غشاهای ماتریس ترکیبی بر پایه پلی‌‌اتر سولفون دارای نانوذرات کبالت فریت با روش ریخته‌گیری محلول پلیمری و غوطه‌وری در حمام آب تهیه شدند.
روش‌ها: اثر غلظت نانوذرات کبالت فریت تهیه‌شده در محلول پلیمری بر شکل‌شناسی و عملکرد جداسازی غشا بررسی شد. برای ارزیابی غشاهای ساخته‌شده، میکروسکوپی‌های الکترونی پویشی (SEM) و نیروی اتمی (AFM)، پراش پرتو X (XRD)، طیف‌سنجی زیر‌قرمز (FTIR)، اندازه‌گیری تخلخل، زاویه تماس آب، شار آب، پس‌زنی نمک سدیم سولفات و بررسی قابلیت غشا در برابر گرفتگی انجام شد.
یافته‌ها: عکس‌های SEM از سطح غشا نشان داد، نانوذرات کبالت فریت طی فرایند ساخت غشا، خود‌به‌خود به سطح مشترک غشا-آب مهاجرت می‌کنند تا انرژی بین‌سطحی را کاهش دهند. بررسی عکس‌های SEM،‌ ساختار غشایی نامتقارن با لایه بالایی چگال و زیرلایه متخلخل با ساختار کانال‌های انگشتمانند را نشان داد. استفاده از نانوذرات کبالت فریت در ماتریس غشا باعث کاهش زاویه تماس آب از مقدار °71 تا °48 شد. نتایج عکس‌های AFM حاکی از کاهش زبری غشاهای ماتریس ترکیبی در مقایسه با غشای خالص بود که به بهبود خواص ضدگرفتگی غشا در پس‌زنی پروتئین منجر شد. شار آب خالص عبوری از غشا در ابتدا با جادادن نانوذراتافزایش یافته و در غلظت بیش %1 وزنی به‌دلیل کلوخگی نانوذرات، کاهش یافت. با افزودن نانوذرات درصد پس‌زنی نمک سدیم سولفات از %60 برای غشای خالص تا حدود %80 برای غشای دارای %1 وزنی نانوذرات کبالت فریت افزایش یافت. غشای ماتریس ترکیبی دارای %1 وزنی نانوذرات کبالت فریت بهترین عملکرد را در مقایسه با سایر غشاها نشان داد.


کلیدواژه‌ها


عنوان مقاله [English]

Fabrication and Investigation of Separation Performance and Antifouling Properties of Mixed Matrix PES-Based Nanofiltration Membrane Containing Cobalt-Ferrite Nanoparticles

نویسندگان [English]

  • Farhad Zareei
  • Samaneh Bandehali
  • Mohammad Ebrahimi
  • Sayed Mohsen Hosseini
Department of Chemical Engineering, Faculty of Engineering, Arak University, Postal Code 138156-8-8349, Arak, Iran
چکیده [English]

Hypothesis: Mixed matrix polyether sulfone (PES)-based membranes, containing cobalt-ferrite nanoparticles, were prepared by polymer solution casting technique through phase inversion method in water bath.
Methods: The concentration effect of CoFe2O4 nanoparticles, synthesized in polymeric solution, on the morphology and separation performance was studied. Scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), porosity measurement, water contact angle, water flux, Na2SO4 rejection as well as membrane antifouling ability were used to characterize the membrane.
Findings: The SEM images showed the movement of NPs toward water-membrane interface to reduce surface energy during the fabrication process. The SEM images also showed an asymmetric structure with a dense active layer and a porous sub-layer with finger-like channels for the prepared membranes. The use of cobalt ferrite nanoparticles in the membrane matrix decreased the water contact angle from 71° to 48°. The results of AFM images also showed a smoother surface for the prepared mixed matrix membranes compared to the bare ones, which improved the membrane antifouling property in BSA rejection. Pure water flux (PWF) was initially enhanced by incorporation of cobalt ferrite NPs and then decreased by up to 1 wt% NPs due to NPs agglomeration. Moreover, Na2SO4 salt rejection increased from 60% for the neat membrane to 80% for the modified ones with 1.0 wt% cobalt-ferrite nanoparticles. The mixed matrix membrane containing 1.0 wt% cobalt-ferrite nanoparticles showed better performance compared to others.

کلیدواژه‌ها [English]

  • polymeric membrane
  • nanofiltration
  • cobalt-ferrite nanoparticles
  • purity
  • antifouling ability
  • separation performance
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