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نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشجوی دکتری منابع آب، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران.

2 دانشیار، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران.

چکیده

زمینه و هدف: کروم شش ظرفیتی از جمله فلزات سنگین سمی و قابل حل در آب است که هم از طریق سیستم گوارش و هم از طریق پوست در بدن انسان جذب و ذخیره می­گردد. میزان کروم در آب شرب شهر بیرجند بیش از حد مجاز است، لذا مطالعه حاضر با هدف بررسی امکان حذف کروم شش ظرفیتی با استفاده از پودر و کربن مخروط کاج و مقایسه این دو جاذب با یکدیگر انجام شد.
مواد و روش‌ها: در این مطالعه برای محاسبه کارایی حذف (Re)، پارامتر­های زمان تماس، pH، غلظت اولیة کروم شش ظرفیتی در محلول، غلظت جاذب بر میزان جذب این فلز و اثر دما بررسی شد. آزمایش‌ها به صورت ناپیوسته بر روی شیکر انجام گرفت.
یافته‌ها: میزان جذب کروم به میزان قابل توجهی به pH محلول بستگی دارد و بیشترین میزان جذب زمانی حاصل شد که pH محلول در محدوده 3 برای پودر و 1 برای کربن مخروط کاج قرار داشت. حداکثر حذف کروم شش ظرفیتی برای پودر مخروط کاج 96/5 درصد و برای کربن حاصل از آن 93/958 درصد بود. بر اساس نتایج، جذب یون محلول کروم شش ظرفیتی از طریق جاذب­های مورد استفاده در این پژوهش، از مدل ایزوترمی لانگمیر به خوبی تبعیت می­کند.
نتیجه‌گیری: بیشترین میزان جذب کروم، توسط پودر مخروط کاج بود و می­توان از مخروط کاج به عنوان یک روش مؤثر و ارزان ‌قیمت در جهت حذف کروم شش ظرفیتی از پساب­های آلوده استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

The survey of chromium (VI) Adsorption from aqueous solutions by powder and activated Carbon Pine Cones

نویسندگان [English]

  • Fahimeh Sharifan 1
  • Ali Shahidi 2
  • Abbas Khashei 2

1 Ph.D. student of Water Resources Engineering, School of Agriculture, University of Birjand, Iran.

2 Associate Professor,Department of Water Engineering, School of Agriculture, University of Birjand, Iran.

چکیده [English]

Background& objective: The hexavalent chromium is a toxic and water-soluble heavy metal that is absorbed and stored through the digestive system and through the skin in the human body. That amount is exceeded in drinking water in Birjand. So the purpose of this studies, Process about remove the hexavalent chromium by using from pine fruit powder, carbon and compare to each other.
Methods: In this research, for Calculate removal efficiency (Re), Parameters of contact time, pH, adsorbent dose, initial Cr (VI) concentration and Temperature was studied. Experiments were intermittently performed in batch reactor on Shaker.
Results: The results showed that the absorption of chromium significantly depends on the pH of the solution and the absorption rate in the range of 3 for powder and 1 for carbon was achieved when the pH of the solution. The maximum removal of Cr (VI) for pine fruit powder is 96/5 % and for activated Carbon Pine Cones is 93/958%. The results indicate that the soluble chromium ions through the absorbent used in this study, as well as follow the Langmuir isotherm model.
Conclusion: The most remove of the hexavalent chromium happened by pine fruit powder and Pine cones can be used as an effective and inexpensive method to remove of the hexavalent chromium from contaminated wastewater.

کلیدواژه‌ها [English]

  • Absorption efficiency
  • Activated Carbon
  • Chromium (VI)
  • Isotherm
  • Pine fruit powder
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