جداسازی رنگ‌زای راکتیو قرمز 120 از محلول آبی توسط غشاهای نانوکامپوزیتیNiFe2O4-SiO2/ PVDF

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 دانشیار، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه صنعتی شاهرود، شاهرود، ایران

3 دانشیار، آزمایشگاه تحقیقاتی غشا، دانشکده فنی کاسپین، پردیس فنی، دانشگاه تهران، تهران، ایران

چکیده

تخلیه پساب‌های حاوی رنگ‌زاها از سوی صنایع مصرف‌کننده رنگ‌زاها، صدمات جبران‌ناپذیری را به محیط‌زیست و انسان وارد می‌کند. امروزه استفاده از فناوری جداسازی غشایی به‌عنوان یک فناوری نوین و کاربردی در جداسازی رنگ‌زاها مطرح است. با این ‌حال غشاهایی که در تصفیه آب و پساب استفاده می‌شوند از مشکلات رقابت تراوایی و انتخاب‌پذیری و نیز عمرکوتاه به‌دلیل گرفتگی رنج می‌برند. از‌این‌رو در این پژوهش تلاش شد تا با افزودن نانوذرات NiFe2O4-SiO2 خواص آب‌دوستی و ضدگرفتگی غشاهای پلی وینیلیدن فلوراید (PVDF) بهبود و عملکرد آن در جداسازی رنگ‌زای راکتیو از محلول آبی ارتقا یابد. به‌این منظور ابتدا نانوذرات NiFe2O4-SiO2 به روش سل- ژل تهیه و سپس غشاهای خالص و نانوکامپوزیتی NiFe2O4-SiO2/PVDF به روش وارونگی فازی مرطوب ساخته شد و عملکرد آنها بررسی شد. نانوذرات NiFe2O4-SiO2 با استفاده از طیف‌سنجی پراش اشعه ایکس (XRD) و طیف‌سنجی تبدیل فوریه مادون قرمز (FTIR) مشخصه‌یابی شدند. مورفولوژی غشا، زبری سطح، آب‌دوستی سطح، عملکرد جداسازی، تراوایی آب خالص، تخلخل و شعاع متوسط منافذ غشاها به‌ترتیب با استفاده از میکروسکوپ الکترونی روبشی نشر میدانی (FESEM)، میکروسکوپ نیروی اتمی (AFM)، آنالیز زاویه تماس (CA) و آزمایش اندازه‌گیری تراوایی آب خالص (PWF) و روش وزن‌سنجی بررسی شد. محلول آبی حاوی ppm 30-10 رنگ‌زای راکتیو قرمز 120 به‌عنوان پساب سنتزی استفاده شد. نتایج آنالیز زاویه تماس نشان داد که افزودن نانوذرات NiFe2O4-SiO2 به مقدار 3/0 درصد وزنی به ماتریس پلیمری زاویه تماس غشا از 5/77 درجه در غشای خالص به 7/51 درجه در غشای نانوکامپوزیتی رسید که نشان از افزایش آب‌دوستی غشا داشت. نتایج حاصل از AFM نشان داد که با افزودن نانوذرات NiFe2O4-SiO2 در ماتریس PVDF، زبری سطح غشاها کاهش یافت. همچنین نتایج نشان داد که غشاهای نانوکامپوزیتی حاوی 3/0 درصد وزنی نانوذرات NiFe2O4-SiO2 در مقایسه با سایر غشاهای ساخته شده، با کارایی جداسازی بیش از 5/99 درصد دارای بهترین عملکرد در جداسازی رنگ‌زای راکتیو قرمز 120 از محلول آبی است.

کلیدواژه‌ها


عنوان مقاله [English]

Separation of Reactive Red 120 Dye from Aqueous Solution by NiFe2O4-SiO2/PVDF Nanocomposite Membranes

نویسندگان [English]

  • Seyed Mehdi Hosseinifard 1
  • Behnaz Dahrazma 2
  • Mohammad Ali Aroon 3
1 PhD Candidate, Dept. of Civil and Environment Engineering, Shahrood University of Technology, Shahrood, Iran
2 Assoc. Prof., Dept. of Civil and Environment Engineering, Shahrood University of Technology, Shahrood, Iran
3 Assoc. Prof., Membrane Research Laboratory, Caspian Faculty of Engineering, College of Engineering, University of Tehran, Tehran, Iran
چکیده [English]

The discharge of dye-containing wastes by the dye-consuming industry causes irreparable damage to the environment and humans. Nowadays, the use of membrane separation technology is a new and applicable technology in dyes separation. However, membranes used in water and wastewater treatment suffer from problems such as permeability-selectivity trade-off as well as short life due to fouling. Therefore, in this study, we tried to improve the hydrophilicity and antifouling properties of polyvinylidene fluoride (PVDF) membranes by adding NiFe2O4-SiO2 nanocomposite and improve its performance in reactive dye separation from aqueous solution. For this purpose, first NiFe2O4-SiO2 nanoparticles were prepared by sol-gel method and then pure and NiFe2O4-SiO2/PVDF nanocomposite membranes were fabricated by wet phase inversion method and their performance was evaluated. The synthesized nanoparticles were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) methods. Membranes morphology, surface roughness, hydrophilicity of the membrane surface, separation performance, pure water flux, porosity and pore radius were characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), contact angle tests (CA), pure water flux test (PWF) and gravimetric methods, respectively. Aqueous solution containing 10-30 ppm reactive red 120 was used as test wastewater. The results of the contact angle analysis showed that by addition of 0.3 wt.% NiFe2O4-SiO2 nanoparticles to the polymer matrix, the membrane contact angle decreased from from 77.5° in the pure membrane to 51.7° in the nanocomposite membrane. It showed an increase in membrane hydrophilicity. AFM results showed that the surface roughness decreased as NiFe2O4-SiO2 content increased in PVDF matrix. It was also found that nanocomposite membrane containing 0.3 wt.% NiFe2O4-SiO2 nanoparticles has the best separation performance among the other fabricated membranes and this membrane can reject reactive red 120 dye from aqueous solution completely (99.5%).

کلیدواژه‌ها [English]

  • nanofiltration membrane
  • polyvinylidene fluoride
  • Reactive Red 120 Dye
  • NiFe2O4-SiO2
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