IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 554-563    Article in Press

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B. Kamarehie, E. Aghaali, SA. Musavi, SY. Hashemi and A. Jafari
( Received: November 09, 2017 – Accepted in Revised Form: January 04, 2018 )

Abstract    Nitrate contamination of water resources and the growing concentration of nitrate endanger human health and the environment and considering its reduction strategies from water resources is important. The aim of this study was to investigate the possibility of removal of nitrate from aqueous solutions using granular activated carbon from grape wood coated with iron nanoparticles. The results showed that more than 99% of the nitrate was removed from the solution using granular activated carbon/nanoparticles zero valent iron (GAC/NZVI). The nitrate adsorption process by GAC followed the Freundlich isotherm (R2 = 0.95) and NZVI and GAC/NZVI followed Langmuir isotherm (R2 = 0.96). Furthermore, the kinetic studies of all three adsorbents for nitrate adsorption showed the highest correlation with the pseudo-second order equation. According to the results of this study, it can be stated that activated carbon derived from grape wood coated by iron nanoparticles as a relatively cheap adsorbent is efficient in nitrate removal from water.


Keywords    Nitrate, Activated Carbon, Iron Nanoparticles, Adsorption



آلودگی منابع آب به نیترات و سرعت رو به رشد افزایش غلظت نیترات در منابع مذکور، سلامت انسان و محیط زیست را به مخاطره انداخته است و بررسی راهکارهای کاهش آن از منابع آب اهمیت بسزایی دارد. این مطالعه با هدف بررسی امکان استفاده از کربن فعال گرانوله حاصل از چوب انگور پوشش داده شده با نانو ذرات آهن برای حذف نیترات از محلول های آبی انجام شد. نتایج نشان داد بیش از 99 درصد از نیترات با استفاده از GAC/NZVI از محلول حذف شد، و فرایند جذب نیترات با GAC از ایزوترم فروندلیچ (R2= 0.95) و با NZVI و GAC/NZVI از ایزوترم لانگمویر (R2=0.96) پیروی می کرد. همچنین مطالعه کنتیکی هر سه جاذب در جذب نیترات بیشترین هم بستگی را با معادله درجه دوم کاذب نشان داد. با توجه به نتایج حاصل از این مطالعه می توان اظهار نمود که کربن فعال حاصل از چوب انگور با پوشش نانو ذرات آهن یک جاذب نسبتا ارزان قیمت و مناسب برای جذب نیترات از آب می باشد.


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