IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1677-1683    Article in Press

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M. R. Kosari, H. Sepehrian and R. Salamat Ahangari
( Received: June 01, 2016 – Accepted in Revised Form: November 11, 2016 )

Abstract    The current study was attributed to uranium (VI) ions adsorption using a anion exchanger resin, Dowex2x8, in the presence of sulfate anions. Evaluation of operational parameters including contact time, pH, initial concentration of uranium ions, and presence of various anions (including phosphate, sulfate, chloride, fluoride, and nitrate) in the solution was assessed on sorption performance of Dowex 2x8. Employing the Langmuir and Freundlich binding models, isotherm analysis was performed to clarify the relation between uranium ions adsorbed on the resin and the concentration of remaining uranium ions in the aqueous phase. To reveal the rate-limiting step of the sorption process, kinetics modeling using pseudo first-order and pseudo second-order equations was also carried out. Maximum sorption capacity for Dowex 2x8 anionic exchanger resin on uranium removal process was found to be 303.03 mmol g-1. It was also disclosed that existence of diverse anion contents in the solution could affect the uranium sorption using Dowex 2x8 anion exchanger resin.


Keywords    Dowex 2x8, Anion exchanger resin, Anion effect, Adsorption, Uranium, Heavy metals.


چکیده    مطالعه ی حاضر بر روی جذب یون های اورانیوم (VI) با استفاده از یک رزین تبادلگر آنیونی، Dowex2x8، در حضور یونهای سولفات انجام شده است. ارزیابی پارامترهای عملیاتی شامل زمان تماس، pH، غلظت اولیه یون های اورانیوم و حضور گونه های آنیونی مختلف (شامل فسفات، سولفات، کلراید، فلوئور و نیترات) بر روی رفتار جذبی Dowex 2x8 در محلول ارزیابی شد. تحلیل ایزوترم با استفاده از مدلهای همبستگی لانگمویر و فروندلیچ به منظور مشخص کردن رابطه ی بین یون های اورانیوم جذب شده بر روی رزین و غلظت یون های اورانیوم باقی مانده در فاز آبی انجام گردید. برای آشکار کردن مرحله ی محدود کننده ی نرخ جذب، مدل سازی سینتکی با استفاده از معادلات شبه درجه اول و شبه درجه دوم نیز انجام گردید. بیشترین میزان ظرفیت جذب برای رزین تبادلگر آنیونی Dowex 2x8 در فرآیند حذف اورانیوم برابر با 03/303 mmol.g-1 بود. همچنین مشخص گردید که حضور گونه های آنیونی متفاوت در محلول می تواند جذب یون های اورانیوم توسط رزین تبادلگر آنیونی Dowex 2x8 را تحت تاثیر قرار دهد.


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