سنتز نانو ذرات کیتوسان و کاربرد آن در جذب یون‌های فلزی سرب از محلولهای آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای گروه مهندسی محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور

3 استادیار کمیته فناوری‌های نو، ، تهران

4 استادیار گروه شیمی، دانشگاه پیام نور، ساری

چکیده

استفاده از بیوپلیمرها به‌دلیل تجزیه‌پذیری زیستی و کم هزینه بودن، برای حذف فلزات سنگین از آب و فاضلاب مورد توجه واقع شده است. کیتوسان، پلیمری آب‌دوست و کاتیونی است که از حذف گروههای استیل کیتین در محیط بازی به‌دست می‌آید و به‌عنوان یک جاذب معروف به‌طور گسترده برای حذف فلزات سنگین به‌کار می‌رود. در مطالعه حاضر میزان حذف یون‌های فلزی سرب از محلولهای آبی توسط نانو ذرات کیتوسان مورد بررسی قرار گرفت. به این منظور نانو ذرات کیتوسان از اتصال عرضی کیتوسان با اسید مالئیک سنتز شدند. مشخصات جاذب سنتز شده با طیف سنجی مادون قرمز، میکروسکوپ الکترونی پیمایشی آنالیز گردید. اندازه نانو ذرات در محدوده 65 تا250 نانومتر تعیین شد. آزمایش‌های جذب در سیستم ناپیوسته و در دمای اتاق برای بررسی اثر پارامترهایpH، غلظت اولیه فلز و مقدار جاذب بر فرایند جذب انجام شد. بهینه‌سازی جذب با pH اولیه محلول از 3 تا 6 ، غلظت اولیه یون فلزی از 10 تا 100 میلی‌گرم در لیتر و مقدار جاذب از 1 تا  7/5 گرم در لیتر بررسی گردید. تحت این شرایط بیشینه ظرفیت در جذب غلظت اولیه 100 میلی‌گرم در لیتر، pH برابر 6 و مقدار جاذب 2/5 گرم در لیتر به‌دست آمد. حداکثر حذف مؤثر در غلظت 10 میلی‌گرم در لیتر سرب برابر 86 درصد به دست آمد. داده‌های جذب سطحی با مدل‌های هم‌دمای لانگمیر و فروندلیچ مورد بررسی قرار گرفت. بیشینه مقدار جذب برای Pb(II) توسط مدل لانگمیر 25/8 میلی‌گرم بر گرم به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and Application of Chitosan Nanoparticles for Removal of Lead Ions from Aqueous Solutions

نویسندگان [English]

  • Leyla Ekhlasi 1
  • Habibollah Younesi 2
  • Zahra Mehraban 3
  • Nader Bahramifar 4
1 Ph.D. Student of Environmental Eng., Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor
2 Assoc. Prof. of Environmental Eng., Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, (Corresponding Author) (+98 122) 6253101 hunesi@modares.ac.ir
3 Assist. Prof. of New Tech. Committee, Tehran
4 Assist. Prof. of Chemistry, Payam Noor University, Sari
چکیده [English]

Biosorbents have become increasingly important for removal of heavy metal from water and wastewater due to their and biodegradability low costs. Chitosan is a hydrophilic and cationic polymer product of chitin deacetylation and used as an absorbent for removal of heavy metals. In the present study, the adsorption of Pb(II) metal ions from aqueous solution by chitosan nanoparticles was investigated. Nanoparticles are formed by reacting of the free amino groups of chitosan with carboxyl groups of maleic acid as crosslinking agent. Nanoparticles were characterized by Scanning Electron Microscopy (SEM) and fourier transform infrared spectrometry (FT-IR). The average size of the nanoparticles obtained was about 65-250 nm. Adsorption experiments were performed at room temperature in batch system. The effects of pH, concentration of metal ions and adsorbent dose were conducted. Optimization of adsorption was carried out by the initial solution pH ranged from 3 to 6, the initial metal ions concentration ranged from 10 to 100 mg/l and the adsorbent dose ranged from 1 to 7.5 g/l. Under these conditions, optimal values of initial pH solution, concentration of metal ions and adsorbent dose were found at 6, 100 mg/l and 2.5 g/l respectively. The maximum removal efficiently of 86% for Pb(II) in concentration of 10mg/l was achieved. The adsorption data fairly fitted to Langmuir and Freundlich isotherms. The maximum adsorption capacity of 25.8 mg/g based on Langmuir isotherm was obtained.

کلیدواژه‌ها [English]

  • Nanoparticles
  • Chitosan
  • Adsorption
  • Lead
  • Aqueous solutions
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