اصلاح سطح غشاهای تبادل کاتیون با لایه نانوکامپوزیتی کیتوسان و گرافن اکسید اصلاح‌شده با پلی‌آنیلین

نوع مقاله : پژوهشی

نویسندگان

اراک، دانشگاه اراک، دانشکده فنی مهندسی، گروه مهندسی شیمی، کد پستی 8349-8-38156

چکیده

فرضیه: در این پژوهش، سطح غشاهای تبادل کاتیون ناهمگن بر پایه پلی(وینیل کلرید) با استفاده از لایه کامپوزیتی کیتوسان و نانوکامپوزیت گرافن اکسید-پلی‌آنیلین به منظور استفاده در فرایند الکترودیالیز اصلاح شد.
روش‌ها: نانو کامپوزیت‌های گرافن اکسید-پلی‌آنیلین از پلیمرشدن اکسایشی-شیمیایی درجای آنیلین در مجاورت نانوصفحه‌های گرافن اکسید تهیه شدند. برای ارزیابی غشاها، طیف‌سنجی زیرقرمز تبدیل فوریه، میکروسکوپ الکترونی پویشی، محتوای آب، شار و تراوایی، مقاومت یونی، قابلیت نرم‌سازی آب و قابلیت رسوب‌زدایی به‌کار گرفته شد.
یافته‌ها: نتایج طیف‌سنجی زیرقرمز تبدیل فوریه و تصاویر میکروسکوپ الکترونی تشکیل موفق لایه پلی‌آنیلین را روی نانوصفحه‌های گرافن اکسید نشان می‌دهد. همچنین تصاویر میکروسکوپ الکترونی تهیه‌شده، نشانگر تشکیل فیلم یکنواخت کیتوسان-نانوکامپوزیت گرافن اکسید-پلی‌آنیلین بر سطح غشاست. مقدار محتوای آب غشاهای اصلاح‌شده در مقایسه با نمونه پایه بهبود یافت. تراوایی و شار یون سدیم در غشاهای اصلاح‌شده دارای %1/0 وزنی نانوکامپوزیت به مقدار %20 بهبود یافت. مقاومت یونی سطحی غشاهای اصلاح‌شده با افزودن نانوکامپوزیت روند کاهشی نشان داد. غشاها قابلیت مطلوبی در حذف یون‌های عامل سختی آب (کلسیم و منیزیم) نشان دادند، به‌طوری که به‌مدت min 15 درصد جداسازی یون کلسیم و یون منیزیم به‌ترتیب به بیش از 61 و %79 رسید. همچنین، رسوبات تشکیل‌شده بر سطح غشاهای استفاده‌شده با صوت‌دهی به‌طور مؤثری زدوده شدند. غشای اصلاح‌شده عملکرد الکتروشیمیایی مناسبی در مقایسه با نتایج سایر پژوهشگران و نیز برخی نمونه‌های تجاری نشان دادند.

کلیدواژه‌ها

عنوان مقاله [English]

Surface Modification of Cation Exchange Membranes Using Chitosan-co-PANI/Graphene Oxide Nanocomposite Layer

نویسندگان [English]

  • Seyyed Mohsen Hosseini
  • Mahsa Nemati
  • Negar Rafiei
Department of Chemical Engineering, Faculty of Engineering, Arak University, Postal Code: 38156-8-8349, Arak, Iran
چکیده [English]

Hypothesis: The surface modification of polyvinylchloride-based heterogeneous cation exchange membranes was carried out using chitosan-co-polyaniline/graphene oxide nanocomposite layer for the application in electrodialysis process.
Methods: The PANI/GO nanocomposites were prepared by in situ chemical oxidative polymerization of aniline in the presence of graphene oxide nanoplates. Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), water content, flux and permeability, areal ionic resistance, water softening ability and fouling measurements were used to characterize the membrane.
Findings: The FTIR analysis results and SEM images demonstrated successful formation of polyaniline on the graphene oxide nanoplates. The scanning electron microscope images of membranes also exhibited a uniform layer of chitosan-co-PANI/graphene oxide nanoplates on the membrane surface. The water content of modified membranes was higher than that of pristine membrane. The sodium flux and sodium permeability were improved about 20% by 0.1 %wt PANI/graphene oxide nanocomposite. The areal ionic resistance of modified membranes also showed a decreasing trend by utilizing composite nanoplates in the membrane matrix. The prepared membranes showed good ability for Ca and Mg removal from water. The removal efficiency of Ca and Mg by membrane containing 0.5 %wt PANI/graphene oxide composite nanoplates was, respectively, 61 and 79% during 15 min. Moreover, the pollutant and foulant formed on the membrane surface were totally removed by sonication technique. The modified membranes showed suitable electrochemical characteristics compared to membranes reported by other researchers and made by industries.

کلیدواژه‌ها [English]

  • heterogeneous cation exchange membrane
  • surface modification
  • Chitosan
  • graphene oxide/polyaniline
  • deionization

مراجع

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