تولید نانوالیاف پلی‌اکریلیک اسید (PAA)/ دکستران اصلاح‌شده با آنیلین به منظور جذب فلز سرب از محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده نساجی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران

2 دانشکده پلیمر و نساجی، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران

3 دانشکده نساجی، دانشگاه آزاد اسلامی واحد یزد، یزد، ایران

چکیده

در این پژوهش، نانوالیاف پوسته هسته پلی اکریلیک اسید (PAA) / دکستران - پلی آنیلین با ترکیب روش‌های الکتروریسی و پلیمراسیون درجا تهیه شده و قابلیت جذب فلز سنگین این نانو الیاف مورد بررسی قرار گرفته است. نتایج نشان داد که پلی‌اکریلیک اسید و دکستران کاملا به روش عملیات حرارتی که منجربه انجام واکنش استری می‌شود، شبکه‌ای می‌شوند. پلی‌آنیلین با ساختار پوسته مانند بر روی سطح نانوالیاف قرار گرفته و موجب تشکیل نانوالیافی متخلخل با ناحیه سطح زیاد می‌شود. میزان تخلخل موجود بر روی سطح نانوالیاف با حذف نانوذرات کربنات کلسیم در طول فرآیند پلیمراسیون افزایش یافته است. بررسی متغیرهای موثر بر فرآیند جذب نشان داد که بازده جذب از محیط با افزایش مقدار جاذب افزایش یافته و به تدریج به مقدار ثابتی می‌رسد. با افزایش غلظت فلز سرب مقدار درصد حذف کاهش می‌یابد و میزان فلز سرب حذف شده در مقادیر مختلف
pH  متفاوت است. نانوالیاف HT-PAA/dextran ظرفیت جذب نسبتا بالای را برای سرب نشان داده است که بعد از پلیمریزاسیون آنیلین بر روی سطح نانوالیاف به 951.1 میلی‌گرم بر گرم افزایش یافته است. بیشینه ظرفیت جذب 1111.11 میلی‌گرم بر گرم برای جذب فلز سرب توسط نانوالیاف سنتزی به دست آمد. رفتار جذبی نانوالیاف سنتزی از ایزوترم لانگمیور و سینتیک شبه مرتبه دوم پیروی کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Preparation of Polyacrylic Acid (PAA) / Dextran Nanofibres Modified with Aniline to the Removal of Metal (Pb) from Aqueous Solutions

نویسندگان [English]

  • M.R. Yarandpour 1
  • A. Rashidi 1
  • R. Khajavi 2
  • N. Eslahi 1
  • M. E. Yazdanshenas 3
1 Department of Textile, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Polymer & Textile, South Tehran Branch, Islamic Azad University, Tehran, Iran
3 Department of Textile, Yazd Branch, Islamic Azad University, Yazd, Iran
چکیده [English]

In this paper, mesoporous PAA/dextran-polyaniline core-shell nanofibers were prepared with the combination of electrospinning and in-situ polymerization methods and their heavy metal adsorption ability was investigated. The result showed that PAA and dextran can be fully crosslinked through the esterification reaction via a heat-treatment method. Polyaniline with flake-like structure was deposited on the nanofiber surface resulted in high surface area and mesoporous structure of nanofibers. The number of pores was increased by removing the calcium carbonate nanoparticles incorporated on the nanofiber surface during the polymerization process. Investigation of the variables affecting the adsorption process showed that the adsorption efficiency increased with increasing adsorbent and gradually reached a constant value. As the concentration of lead metal decreased, the percentage of removal decreased and the amount of removed metal varied at different pH values. HT-PAA / dextran nanofibers showed relatively high adsorption capacity for Pb, which increased to 951.1 mg / g after aniline polymerization on the surface of the nanofibers. The synthesized nanofibers showed a high maximum adsorption capacity of 1111.11 mg/g for Pb obtained from the Langmuir isotherm model.

کلیدواژه‌ها [English]

  • Polyacrylic acid
  • dextran
  • Polyaniline
  • Adsorption Kinetic
  • Adsorption Isotherm
  • In-situ Polymerization
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