بررسی خاک اره اصلاح شده با دی‌اتیلن‌تری‌آمین به‌عنوان یک جاذب مؤثر برای حذف آهن (III) از نمونه‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد شیمی تجزیه، گروه شیمی، واحد علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی، اهواز، ایران

2 استادیار گروه شیمی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

فلزات سنگین یکی از آلاینده‌های محیط زیست است که امروزه تلاش زیادی برای حذف آن انجام می‌‌شود. در این پژوهش، خاک اره اصلاح شده با دی‌اتیلن‌تری‌آمین به‌عنوان یک جاذب مؤثر به‌منظور حذف آهن (III) از نمونه‌های آبی، مورد بررسی قرار گرفت. در ابتدا خاک اره توسط دی‌اتیلن‌تری‌آمین اصلاح شد. آنالیز SEM نشان داد که سطح ذرات در اثر اصلاح تغییر یافته است. سپس فاکتورهای مؤثر بر فرایند حذف، از قبیل pH محلول، دز جاذب، زمان تماس و دور شیکر بهینه شدند. شرایط بهینه برای غلظت‌های مختلف آهن بین 20 تا 300 میلی‌گرم در لیتر به‌کار برده شد؛ در تمام حالات، میزان حذف قابل توجه بود. در شرایط بهینه بیش از 3/0 ± 95 درصد آهن به غلظت 50 میلی‌گرم در لیتر با به‌کارگیری دز جاذب 5/1 گرم در لیتر در مدت زمان 15 دقیقه حذف شد که نشان دهنده ظرفیت بالا و عملکرد سریع جاذب در حذف آهن است. داده‌های جذب تعادلی با استفاده از مدل‌های ایزوترمی لانگمیر و فروندلیچ بررسی شد. داده‌های تعادل جذب سطحی به‌خوبی با همدمای لانگمیر مطابقت داشت. بیشینه ظرفیت جذب تعادلی لانگمیر معادل 200 میلی‌گرم در گرم برآورد شد. بر اساس نتایج آزمایش‌ها، سینتیک فرایند جذب با مدل سینتیک شبه مرتبه دوم مطابقت بیشتری داشت.  این روش به‌طور موفقیت‌آمیزی برای حذف آهن  (III) از آب شرب شهری، آب چاه، آب رودخانه و پساب صنعتی کاربرد دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the Sawdust Modified with Diethylenetriamine as an Effective Adsorbent for Fe (III) Removal from Water

نویسندگان [English]

  • Azita Ostovan 1
  • Shahla Elhami 2
1 Former Graduate Student of Analytical Chemistry, Khuzestan Science & Research Branch, Isalmic Azad University, Ahwaz, Iran
2 Assist. Prof., Department of Chemistry, Ahwaz Branch, Islamic Azad University, Ahwaz, Iran
چکیده [English]

Heavy metals are environmental pollutants that nowadays a lot of efforts are made to remove them. In this research, the sawdust modified with diethylenetriamine as an effective adsorbent for Fe (III) removal from water samples was conducted. First, the sawdust was modified by diethylenetriamine. SEM analysis showed that the particle surface is changed by modification. Then the effective factors in Fe (III) removal such as pH, adsorbent dose, shaker speed and contact time were studied and optimized. The optimum conditions were employed for various Fe (III) concentrations (20–300 mg L-1) and in all cases, the removal rate was significant. The adsorbent has high capacity for Fe (III) removal in a way that it removed more than 95.0±0.3 % of Fe (III) (50 mg/L) by 1.5 g/L of adsorbent in 15 minutes. The Langmuir and Freundlich isotherms were applied to the adsorption process and their constants were evaluated. The adsorption equilibrium data fitted well to Langmuir isotherm. The maximum Langmuir adsorption capacity of Fe (III) ions was 200.0 mg/g. According to kinetics experiments of Fe (III), the adsorption process had more conformity to pseudo-second-order kinetic model. This method was successfully applied for Fe (III) removal from potable water, well water, river water and industrial wastewater samples.

کلیدواژه‌ها [English]

  • Fe (III)
  • Modified Sawdust
  • Removal
  • Diethylenetriamine
  • Langmuir isotherm
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