سنتز نانوکامپوزیت Polyaniline/Fe3O4 به‌منظور حذف یون‌های سرب از نمونه‌های آب و پساب

نوع مقاله : مقاله پژوهشی

نویسنده

دانشیار گروه مهندسی شیمی، دانشگاه آزاد اسلامی واحد قائم‌شهر، قائم‌شهر، ایران

چکیده

با توجه به اهمیت حذف یون‌های سنگین از نمونه‌های آبی، در پژوهش حاضر، یک نانوکامپوزیت مغناطیسی بر پایه ذرات Fe3O4 پوشش داده شده با پلی‌آنیلین ساخته شد و به‌عنوان جاذب قوی برای حذف یون‌های سرب (II) از نمونه‌های آب و پساب ارزیابی شد. به‌منظور مشخصه‌یابی نانوکامپوزیت، از میکروسکوپ الکترونی عبوری برای تعیین دقیق اندازه نانوذرات و از تکنیک BET برای تعیین سطح مؤثر جاذب و همچنین از آنالیزهای CHNS و TGA به‌ترتیب برای تأیید پوشش نانوذرات مغناطیسی Fe3O4 با پلیمر پلی‌آنیلین و بررسی پایداری حرارتی نانوکامپوزیت اصلاح شده استفاده شد. از دستگاه طیف‌سنجی جذب اتمی شعله‌ای به‌منظور تعیین مقدار یون سرب در محلول استفاده شده است. مشخصه‌های تأثیرگذار بر حذف یون سرب از جمله pH، مقدار جاذب و زمان تماس در دماهای مختلف بهینه شدند. مقادیر بهینه pH و مقدار جاذب و زمان تماس برای ۱۰۰ میلی‌لیتر محلول با غلظت اولیه ppm۵۰ به‌ترتیب در محدوده pH=9، 3 میلی‌گرم جاذب و زمان تماس 60 دقیقه به‌دست آمد. داده‌های تعادلی به‌دست آمده از مطالعات جذب، نشان دادند که ایزوترم لانگمیر نتایج بهتری را نسبت به ایزوترم فروندلیچ از خود نشان داد. همچنین بیشترین ظرفیت جذب سرب (II) روی نانوکامپوزیت Polyaniline/Fe3O4 برابر با 9/114 میلی‌گرم سرب بر گرم جاذب به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

The Synthesis of Polyaniline/Fe3O4 to Removal of Lead Ions from Water and Wastewater Samples

نویسنده [English]

  • Ali Shokouhi Rad
Assoc. Prof., Dept. of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
چکیده [English]

Due to the importance of removing heavy ions from water samples, in the present study, a magnetic nanocomposite based on Fe3O4 particles coated with polyaniline was developed and evaluated as a strong adsorbent to remove lead (II) ions from water and effluent samples. In order to characterize the nanocomposite, the transmission electron microscope was used to determine the exact size of the nanoparticles and the BET technique was used to determine the effective surface of adsorbent and also the CHNS and TGA analyses were used to confirm the coating of Fe3O4 magnetic nanoparticles with polyaniline and the survey of the thermal stability of nanocomposite, respectively. The flame atomic absorption spectroscopy was used to determine the values of lead ions in the solution. Characteristics affecting lead ion removal including pH, adsorbent value and contact time at different temperatures were optimized. Optimal values of pH and adsorption rate and contact time for 100 ml of solution with an initial concentration of 50 ppm were obtained in the pH of 9, 3 mg adsorbent, and contact time of 60 minutes, respectively. Equilibrium data from adsorption studies showed that the Langmuir isotherm showed better results than the Freundlich isotherm. Also, the maximum lead adsorption capacity (II) on Polyaniline/Fe3O4 nanocomposite was 114.9 mg of lead per gram of adsorbent.

کلیدواژه‌ها [English]

  • Removal of Lead
  • Polyaniline
  • Cetyltrimethylammonium bromide
  • Nanocomposite
  • Industrial Wastewater
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