ساخت و بررسی غشاهای ماتریس ترکیبی پلی‌سولفون-مونت‌موریلونیت اصلاح شده با اسید‌ آمینه برای حذف آرسنیک از آب

نوع مقاله: پژوهشی

نویسندگان

1 تبریز، دانشگاه صنعتی سهند، دانشکده مهندسی شیمی/مرکز تحقیقات جامع فناوری غشا، صندوق پستی1996-51335

2 تبریز، شرکت آب و فاضلاب استان آذربایجان شرقی، صندوق پستی 1571

چکیده

در این پژوهش، غشاهای ماتریس ترکیبی پلی‌سولفون (PSf) با پخش مونت‌موریلونیت طبیعی (Mt) و اصلاح‌شده با اسید‌ آمینه (M-AA) برای حذف آرسنیک از آب ساخته شد. آزمون‌های میکروسکوپ الکترونی پویشی، پراش پرتو X، میکروسکوپ نیروی اتمی، تعیین زاویه تماس، گذر‌دهی آب خالص و استحکام مکانیکی برای مقایسه غشاهای خالص و ماتریس ترکیبی پلی‌سولفونی انجام شد. آزمون‌های طیف‌سنجی زیرقرمز و پراش پرتو X، اصلاح موفق مونت‌موریلونیت با اسید ‌آمینه و پروتون‌داربودن گروه عاملی آمینی را نشان داد. پتانسیل زتای مونت‌موریلونیت پس از اصلاح با اسید‌ آمینه از منفی به مثبت تغییر یافت. بیشترین بهبود در گذر‌دهی آب خالص، تخلخل و خواص آب‌دوستی در غشای ماتریس ترکیبی PSf/Mt به دلیل خواص آب‌دوست مونت‌موریلونیت به‌دست آمد. هر چند، مونت‌موریلونیت اصلاح‌شده برهم‌کنش بهتری با پلی‌سولفون داشت و مقاومت مکانیکی را بیشتر افزایش داد. افزون بر این آزمون‌های جذب مشخص کرد، بازده حذف غشای ماتریس ترکیبی PSf/M-AA به‌علت بار مثبت سطح مونت‌موریلونیت اصلاح‌شده بهتراست. نتایج به‌دست آمده نشان داد، مقدار گذر‌دهی آب خالص، آب‌دوستی، زبری، استحکام مکانیکی و ظرفیت جذب آرسنیک غشاهای PSf/M-AA با افزایش مقدار M-AA از 0 تا %1.5 وزنی بیشتر می‌شود. پلی‌سولفون خالص ظرفیت جذب ناچیزی نشان داد، در حالی که ظرفیت جذب برای غشاهای ماتریس ترکیبی حاوی %1.5 وزنی Mt و M-AA به ترتیب تا 1.4 و  16mg/g به‌دست آمد. در نهایت، قابلیت استفاده مجدد غشای ماتریس ترکیبی PSf/M-AA با %1.5 وزنی در پنج مرحله آزمون‌های جذب و کاهش در سامانه فیلترکردن انتهابسته بررسی شد. نتایج به‌دست آمده قابلیت استفاده غشای ساخته شده را برای چند مرحله متداول تأیید کرد.

کلیدواژه‌ها


عنوان مقاله [English]

A PSf/Amino Acid-Modified Montmorillonite Mixed Matrix Membrane for Arsenic Removal from Water: Preparation and Evaluation of Its Properties

نویسندگان [English]

  • Elham Shokri 1
  • Reza Yegani 1
  • Naeimeh Kazemian 2
1 Faculty of Chemical Engineering,/Membrane Technology Research Center; Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran
2 East Azerbaijan Province Water and Wastewater Company, P.O. Box: 1571, Tabriz, Iran
چکیده [English]

Polysulfone (PSf) mixed matrix membranes were prepared by embedding pristine montmorillonite (Mt) together with amino acid (M-AA)-modified Mt in order to remove arsenic from water. The qualitative and quantitative comparisons were made between mixed matrix membranes and pure PSf membrane by FE-SEM, XRD, contact angle, AFM, pure water flux (PWF) and mechanical strength tests. The XRD and FTIR results showed that Mt was successfully modified with amino acid, and the amino functional groups were protonated. After modification with amino acid, the Zeta potential of Mt changed from negative to positive. Maximum improvement in PWF, porosity and hydrophilicity was obtained for PSf/Mt mixed matrix membrane due to hydrophilic properties of Mt. However, the modified Mt showed good interaction with PSf and increased the mechanical strength of mixed matrix membranes. Furthermore, the adsorption experiments showed the PSf/M-AA membranes with better arsenic removal efficiency because of positive surface charge of M-AA. The obtained results showed that by increasing M-AA content from 0 to 1.5 wt%, pure water flflux, surface hydrophilicity, roughness, mechanical strength and arsenic adsorption capacity of the membranes increased. The neat PSf membrane showed a very low adsorption capacity for As (V), however the adsorption capacities of 1.4 and 16 mg/g were obtained for the mixed matrix membranes each containing 1.5 wt% of Mt and M-AA. Finally, membrane re-usability of the 1.5 wt% M-AA embedded PSf membrane was assessed by conducting five cycles of adsorption experiments and membrane regeneration in a dead-end filtration system. The obtained results confirmed the applicability of the prepared membrane for multiple cycles.

کلیدواژه‌ها [English]

  • polysulfone
  • mixed matrix membrane
  • montmorillonite
  • amino acid
  • arsenic

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