حذف رنگ‌زای متیلن‌بلو با استفاده از الیاف کربن فعال بر پایه اکریلیک با کارایی بالا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکترا، گروه شیمی نساجی و علوم الیاف، دانشکده مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشیار، گروه مهندسی نساجی، دانشکده مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران، ایران

3 دانشیار، گروه مهندسی شیمی، دانشکده مهندسی شیمی، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

امروزه تصفیه پساب‌ها برای حذف آلودگی‌های آلی و غیرآلی بسیار حائز اهمیت است. از میان آلاینده‌های آلی، رنگ‌ها تأثیر زیادی بر آلودگی محیط‌زیست دارند. جذب فیزیکی به‌کمک کربن‌های فعال در حذف آلاینده‌ها و فرایند تصفیه فاضلاب‌ها بسیار مفید است. در این پژوهش الیاف کربن فعال با خواص مکانیکی و جذبی بالا از طریق پایدارسازی و فعال‌سازی شیمیایی الیاف اکریلیک تولید شد. جاذب تولیدی با استفاده از آزمون جذب و واجذب نیتروژن، طیف‌سنجی تبدیل فوریه مادون قرمز و اندازه‌گیری جذب ید و خواص مکانیکی مشخصه‌سازی شد. توانایی الیاف کربن فعال تولیدی در جذب رنگ‌زای متیلن‌بلو از محلول آبی به‌طور کامل بررسی شد و تجزیه‌و‌تحلیل جذب با هدف تعیین تأثیر برخی از پارامترها، از جمله pH محلول و غلظت اولیه رنگ‌زا انجام شد. نتایج، نشان‌دهنده حذف سریع و نسبتاً کامل (حدود 95 درصد) رنگ متیلن‌بلو در 12=pH و غلظت اولیه 100 میلی‌گرم در لیتر بود. در بررسی ایزوترم جذب رنگ‌زای متیلن‌بلو، مدل لانگمیر با بیشترین مقدار ضریب تعیین در مقایسه با مدل‌های دیگر به‌نحو مطلوبی فرایند جذب را توصیف کرد. بر این اساس مکانیسم جذب متیلن‌بلو بر الیاف کربن فعال، تک‌لایه و هموژن بود و بیشینه ظرفیت جذب تک‌لایه معادل 83/324 میلی‌‌گرم بر گرم بود. همچنین در این پژوهش داده‌های سینتیکی با استفاده از مدل‌های شبه‌مرتبه اول و شبه‌مرتبه دوم در غلظت‌های مختلف به‌دست آمد. پارامترهای ترمودینامیکی جذب نیز محاسبه و نتایج ماهیت خود به خودی بودن فرایند جذب را نشان دادند. با توجه به نتایج حاصل شده، خواص مکانیکی و ظرفیت جذب الیاف کربن فعال ساخته شده در این پژوهش در مقایسه با سایر جاذب‌ها خواص نسبتاً بهتری را نشان داد.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Methylene Blue Dye Using High Performance Acrylic-Based Activated Carbon Fibers

نویسندگان [English]

  • Amir Rabbi 1
  • Fatemeh Dadashian 2
  • Mansooreh Soleimani 3
1 PhD, Dept. of Textile Engineering, Amirkabir University of Technology, Tehran, Iran
2 Assoc. Prof., Dept. of Textile Engineering, Amirkabir University of Technology, Tehran, Iran
3 Assoc. Prof., Dept. of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

Nowadays, wastewater treatment is important for eliminating organic and inorganic contaminants. Among organic pollutants, colors have a great impact on environmental pollution. Physical adsorption by activated carbons is very useful in removing pollutants and wastewater treatment. In this study, an activated carbon fiber with high mechanical properties and adsorption capacity was prepared through thermal stabilization and chemical activation of acrylic fibers. Nitrogen adsorption/desorption analysis, Fourier transform infrared spectroscopy (FTIR) and measurement of mechanical properties and iodine number were used to investigate different characteristics of the obtained adsorbent. The potential of these new adsorbents for removal of methylene blue (MB) from aqueous solution was investigated in the batch experiments and the influence of main operating parameters, including pH, and the initial dye concentration was studied. Rapid and relatively complete removal (about 95%) of MB dye was achieved at the pH of 12 and initial dye concentration of 100 mg/L. Moreover, it was revealed that the experimental data could be expressed well by the Langmuir and pseudo-second-order model, such that the maximum amount of monolayer adsorption was about 324.83 mg/g. The thermodynamic parameters indicated the spontaneous nature of the adsorption process. According to all results, the mechanical properties and adsorption capacity of the fabricated activated carbon fibers in comparison with other adsorbents exhibit relatively better properties.

کلیدواژه‌ها [English]

  • Adsorption
  • Activated Carbon Fibers
  • Methylene blue
  • Isotherm
  • Kinetics
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