حذف سرب از محلول های آبی با استفاده از خاکستر برگ نخل در سیستم جذب ناپیوسته

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی محیط ‌زیست، پژوهشکده خلیج فارس، دانشگاه خلیج فارس، بوشهر

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

3 استادیار گروه تکنولوژی‌های نوین، پژوهشگاه مطالعات آموزش و پرورش، تهران

4 دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

چکیده

در این تحقیق قابلیت خاکستر برگ نخل کبکاب، به‌عنوان یک ماده جاذب ارزان قیمت برای حذف یون‌ سرب از محلول آبی مطالعه شد. متغیرها از قبیل pH، غلظت یون، مقدار جاذب و دما در سیستم ناپیوسته بررسی شد. نتایج نشان داد که pH بهینه برای حذف یون سرب برابر با 5 بود. همچنین کارایی جذب در مدت 60 دقیقه در غلظت‌های 50، 100، 150، 200، 250 و 300 میلی‌گرم در لیتر با استفاده از 5/0 گرم در لیتر جاذب در دمای 20 درجه سلسیوس به‌ترتیب برابر با 46/99، 47/91، 49/80 ، 62/69، 34/57 و 29/51 درصد به‌دست آمد. این مطالعه نشان داد که با افزایش مقدار جاذب از 1/0 تا 2 گرم در لیتر، میزان جذب افزایش می‌یابد. همچنین بررسی پارامتر گرمایی، نشان دهنده وابسته بودن فرایند جذب به دما بود و نتایج بیانگر ترتیب کارایی جذب به‌صورت 40 > 30 > 20 درجه سلسیوس بود. بر اساس مدل لانگمیر، مقدار ثابت b برابر 152/0 و حداکثر جذب 2/35 بود. همچنین طبق مدل فروندلیچ، مقدار ثابت n که بیانگر شدت جذب است، برابر 5/4 بود. بر اساس مدل سیپس حداکثر جذب برای سرب 5/31 بود. این مطالعه نشان داد که خاکستر برگ نخل، پتانسیل خوبی برای حذف یون فلزات سنگین از محلول آبی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Lead Removal from Aqueous Solution Using Date-Palm Leaf Ash in Batch System

نویسندگان [English]

  • Alimohammad Sanati 1
  • nader Bahramifar 2
  • Zahra Mehraban 3
  • Habibollah Younesi 4
4 Associate Prof., Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Noor
چکیده [English]

In this study potential usefulness of date-palm leaf (Phoenix dactylifera) ashes as an inexpensive adsorbent for Pb(II) ions has been demonstrated. For this purpose, some variables such as pH, Pb (II) ion concentrations, adsorbent dosage and temperature in batch systems were investigated. The obtained results showed that the optimum pH for removal of Pb (II) ions from aqueous solutions was equal to 5. Also, the adsorption efficiency at 60 minutes with 50, 100, 150, 200, 250 and 300 mg/l Pb(II) concentrations were 99.46, 91.47, 80.49, 69.62, 57.34 and 51.29% respectively, by 0.5 g/l adsorbent dosage and at temperature of 20˚C. Consideration of adsorbent in this study showed that with increasing of adsorbent dosage from 0.1 to 2g/l the adsorption rate increased. Also, thermodynamic consideration showed that adsorption process was dependent to temperature and results showed that removal efficiency order was 40 ˚C > 30˚C > 20 ˚C. This study concluded date-palm leaf ashes, have good potential as an adsorbent to remove toxic heavy metals like lead from aqueous solutions.

کلیدواژه‌ها [English]

  • Physical Adsorption
  • Pb(II) Ions
  • Date-Palm (Phoenix dactylifera)
  • Batch System

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