حذف سرب از محلول آبی با استفاده از جاذبهای ارزان قیمت

نوع مقاله: مقاله پژوهشی

نویسنده

استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زابل

چکیده

در این تحقیق حذف سرب از محیط آبی با استفاده از پوسته شلتوک، خاک اره و ساقه آفتابگردان مورد مطالعه قرار گرفت. ابتدا جاذبها تهیه شدند و سپس با استفاده از الک شماره 30 و 40، ذرات با اندازه متوسط 500 میکرون از هرکدام به‌دست آمد. محلول سرب با غلظت 25 میلی‌گرم در لیتر ساخته شد و آزمایش‌های جذب انجام گردید. نتایج نشان داد که زمان تعادل برای پوسته شلتوک 90 دقیقه و برای دو جاذب دیگر هر کدام 120 دقیقه است. pH بهینه جذب برای هرسه جاذب برابر 6 به‌دست آمد. همچنین نتایج آزمایش‌ها نشان داد که با کاهش غلظت ورودی سرب از 80 به 1 میلی‌گرم در لیتر، راندمان جذب برای هر سه جاذب افزایش می‌یابد. به‌طوری‌که منحنی راندمان جذب برای جاذبهای مختلف، همگرا می‌شود. راندمان جذب با افزایش جرم نیز زیاد می‌شود. آزمایش‌های ایزوترم جذب نشان داد که مدل تمکین از برازش بهتری نسبت به مدل‌های لانگمیر و فروندلیچ برخوردار است.

کلیدواژه‌ها


عنوان مقاله [English]

Lead Removal from Aqueous Solutions Using Low-cost Adsorbents

نویسنده [English]

  • Zaman Shamohammadi Heidari
Assist. Prof. of Water Eng. Dept., College of Agriculture, University of Zabol
چکیده [English]

This study examines the removal of lead from an aqueous medium using rice husk, sawdust, and sunflower stem. For this purpose, sieves No. 30 and 40 were used to obtain particles with a mean size of 500 microns from each of the absorbents. The Pb(II) solution was prepared with a concentration of 25 mg/liter before absorption tests were conducted. The results showed that the equilibrium time for rice husk was 90 min. while the same parameter for each of the other two absorbents was 120 min. An optimal absorption pH of 6 hours was obtained for each absorbent. The tests also showed that the absorption efficiency for each absorbent increased as the input lead concentration was reduced from 80 to 1mg/liter, so that the absorption efficiencies for different absorbents converged. Absorption efficiency also increased with mass. Isothermal absorption tests showed that the Tomkin model had a better fitness than the Langmuir and Freundlich models.

کلیدواژه‌ها [English]

  • Rice husk
  • Sawdust
  • Sunflower Stem
  • Temkin Adsorption Isotherm
  • Absorption Efficiency
  • Lead
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