حذف آرسنیک از محیط‌های آبی توسط خاک اره اصلاح شده و اصلاح نشده درخت بلوط

نوع مقاله: مقاله پژوهشی

نویسندگان

1 - استاد گروه مهندسی بهداشت محیط، مرکز تحقیقات علوم بهداشتی، دانشکده بهداشت، دانشگاه علوم پزشکی همدان

2 کارشناس ارشد مهندسی بهداشت محیط، دانشگاه علوم پزشکی همدان

چکیده

در این تحقیق، خاک اره به‌عنوان ماده‌ای اقتصادی در حذف آرسنیک از محیط‌های آبی بررسی شد. در این مطالعه از خاک اره اصلاح شده و اصلاح نشده بلوط استفاده شد. نمونه آرسنیک مورد استفاده با اضافه کردن آرسنات سدیم در آب مقطر آماده شد و تأثیر pH، مقدار جاذب، زمان تماس و غلظت اولیه آرسنیک پنج ظرفیتی بر میزان جذب سطحی آرسنات توسط هر دو جاذب بررسی شد. نتایج نشان داد که خاک اره اصلاح شده با زمان تماس 60 دقیقه و در pH برابر 7، مقدار جاذب 4 گرم در لیتر و غلظت اولیه آرسنات 150 میکروگرم در لیتر، بیشترین راندمان جذب (بیشتر از 91 درصد) را داشت. داده‌های هر دو جاذب به‌خوبی از مدل لانگمیر تبعیت کرد. در شرایط بهینه با غلظت اولیه آرسنات 150 میکروگرم در لیتر و در pH، زمان تماس و دز جاذب بهینه، بیشترین میزان حذف توسط خاک اره اصلاح شده، 85/93 درصد به‌دست آمد. با توجه به بازدهی بالا در دز جاذب و زمان کمتر و عدم نیاز به اصلاح pH و همچنین قابلیت دسترسی و ارزان بودن خاک اره، استفاده از خاک اره اصلاح شده بلوط، به‌عنوان جاذبی مؤثر در حذف آرسنیک از محیط‌های آبی پیشنهاد می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Arsenic Removal from Aqueous Solutions Using Modified and Unmodified Oak Sawdust

نویسندگان [English]

  • Ali Reza Rahmani 1
  • samira Amini 2
1 Prof. of Environmental Health Engineering, Health Sciences Research Center, Faculty of Public Health, Hamadan University of Medical Sciences, Hamadan
2 MSc Gradute of Environmental Health Engineering, Hamadan University of Medical Scieences, Hamadan
چکیده [English]

In this research, oak sawdust, in both modified and unmodified forms, was used as an economical and low-cost material for the removal of arsenic from aqueous solutions. For this purpose, arsenic synthetic samples were prepared using NaAsO2 in distilled water and the effects of pH, adsorbent dosage, contact time, and initial As(V) concentration were investigated on As(V) adsorption using the adsorbents prepared. The results showed that modified sawdust achieved the highest efficiency (>91%) over a contact time of 60 min and at pH 7 when the adsorbent dosage was 4gr/L and the initial As(V) concentration was 150 µg/L. The data from both adsorbents fitted well to the Langmuir isotherm. Under optimum conditions (an initial As(V) concentration of 150 µg/L and optimal absorption pH, contact time, and adsorbent dosage), maximum As(V) removal efficiencies were 93.85% and 91.034% with the modified  and unmodified sawdust adsorbents, respectively. Given the availability and low cost of the adsorbent used and the high removal efficiency obtained at  lower adsorbent dosages and contact times, the modified oak sawdust may be recommended as an effective adsorbent for the removal of arsenic (v) from aqueous solutions, especially since it requires no need for pH modification.

کلیدواژه‌ها [English]

  • Oak
  • Sawdust
  • ARSENIC
  • Aqueous solution

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