ساخت و بررسی غشای کامپوزیتی فیلم نازک پلی‌آمینی بر پایه پلی‌(5،2-بنزیمیدازول) با پایداری شیمیایی زیاد

نوع مقاله: پژوهشی

نویسندگان

1 بابل، دانشگاه صنعتی نوشیروانی بابل، دانشکده مهندسی شیمی، کدپستی 4714871167

2 تهران، مؤسسه تحقیقات فناوری و علوم هسته‌ای، صندوق پستی 1339-14155

چکیده

فرضیه: با وجود کاربرد گسترده غشاهای نانوفیلترکردن در محلول‌های آبی، قابلیت استفاده آن‌ها در تصفیه حلال‌های آلی نیز جالب توجه است. با وجود این، هنوز چالش توسعه غشاهای نانوفیلترکردن پلیمری مقاوم در برابر حلال به منظور استفاده در محدوده گسترده‌ای از حلال‌های آلی وجود دارد. پلیمرهای بسیاری با مقاومت زیاد در برابر حلال‌ها وجود دارند که از این میان می‌توان به پلی‌ایمید (PI) و پلی‌بنزیمیدازول (PBI) اشاره کرد که برای ساخت لایه ‌نگه‌دارنده غشاهای مقاوم در برابر حلال استفاده می‌شوند. پلی(5،2-بنزیمیدازول) (ABPBI) نوعی پلیمر با ساختار شیمیایی مشابه یا حتی بهتر نسبت به پلی‌بنزیمیدازول است.
روش‌ها: ابتدا پلیمر پلی(5،2-بنزیمیدازول) با خلوص زیاد سنتز شد. در مرحله بعد، غشاهای ABPBI و پلی‌وینیلیدن فلوئورید (PVDF) سنتز شدند. غشاهای کامپوزیتی فیلم نازک (TFC) پلی‌آمینی با روش پلیمرشدن بین‌سطحی و از واکنش بین پلی‌اتیلن ایمین (PEI) و سیانوریک ‌کلرید به‌دست آمدند. در پایان، ساختار، خواص فیزیکی و شیمیایی، پایداری شیمیایی و عملکرد غشاهای پایه و کامپوزیتی فیلم نازک حاصل از پلیمر ABPBI با غشاهای حاصل از PVDF مقایسه شدند.
یافته‌ها: آزمون‌های پایداری شیمیایی شامل حل‌پذیری، مقدار ژل و درجه تورم حاکی از پایداری بسیار زیاد غشای ABPBI بوده است. درجه تورم در حلال‌های اتانول، متانول و نرمال هگزان برای غشای پایه ABPBI  به ترتیب 0.0132، 0.175 و 0.01 و برای PDVF  به ترتیب 0.9، 0.808 و 0.34 بوده است. شار عبوری آب از غشاهای پلی‌آمینی ABPBI-PA و PVDF-PA  به ترتیب برابر با 20 و 26kg/m2.h و مقدار پس‌زنی محلول آبی دارای 10ppm رنگ‌دانه بلور بنفش به ترتیب برابر 85 و %81 بود.

کلیدواژه‌ها


عنوان مقاله [English]

Fabrication and Investigation of Polyamine Thin Film Composite Membrane based on Poly(2,5-benzimidazole) with High Chemical Stability

نویسندگان [English]

  • Ali Bali Eslami 1
  • Majid Peyravi 1
  • Mohsen Jahanshahi 1
  • Hamzeh Hosseinpour 2
1 Department of Chemical Engineering, Babol Noshirvani University of Technology, P.O. Box: 47148-71167, Babol, Iran
2 Nuclear Science and Technology Research Institute (NSTRI), P.O. Box: 14155-1339, Tehran, Iran
چکیده [English]

Hypothesis: Despite the wide application of nanofiltration (NF) membranes in aqueous solutions, their potential usage in the treatment of organic solution has been considered. However, it is still a challenge to develop polymeric solvent resistant nanofiltration membranes (SRNF) that can be applied in a broad range of organic solvents. There are many polymers with high resistance to solvents such as polyimide (PI) and polybenzimidazole (PBI) which used for making ultrafiltration membrane for SRNF. Poly(2,5-benzimidazole) (ABPBI) is a sort of polymer with similar or even better chemical structure than PBI.
Methods: At first, a high-purity poly(2,5-benzimidazole) (ABPBI) polymer was synthesized. In the next step, ABPBI and polyvinylidene fluoride (PVDF) membranes were synthesized. TFC polyamine membranes were prepared by the interfacial polymerization (IP) of polyethylenimine and cyanuric chloride. Finally, the physical and chemical structure as well as chemical stability and membrane performance of UF and TFC membranes obtained by ABPBI polymer were evaluated and compared with those of PVDF membrane.
Findings: Chemical stability tests including solubility, gel content and swelling degree indicated much higher stability of ABPBI membrane. The swelling degree in ethanol, methanol and n-hexane for ABPBI and PVDF membranes were 0.0132, 0.175, 0.01 and 0.9, 0.808, 0.34, respectively. The water fluxes for ABPBI-PA and PVDF-PA membranes were 20 and 26 kg/m2.h and the rejection for 10 ppm aqueous solution of crystal violet (CV, 408 g/mol) was 85 and 81, respectively.

کلیدواژه‌ها [English]

  • thin film composite membrane
  • poly(2
  • 5-benzimidazole)
  • organic solvent nanofiltration
  • polyamine top-layer
  • chemical stability
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