Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 12 (December 2018) 2001-2008   

PDF URL: http://www.ije.ir/Vol31/No12/C/2-2966.pdf  
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  DYE ADSORPTION ON THE BLENDS OF SAFFRON PETALS POWDER WITH ACTIVATED CARBON: RESPONSE SURFACE METHODOLOGY
 
R. Davarnejad, R. Pishdad and S. Sepahvand
 
( Received: August 03, 2018 – Accepted in Revised Form: October 26, 2018 )
 
 

Abstract    One of the famous dyes is methylene blue (MB) which is a symbol of hazardous dyes. In this research, methylene blue was adsorbed using the blends of saffron petals with activated carbon. Five independent variables involving pH (2-13), contact time (5-270 min), saffron petals powder dosage (0.1-10 g/l), initial concentration of methylene blue solution (20-300 ppm) and activated carbon dosage (0.1-10 g/l) for methylene blue adsorption were studied. For this purpose, pure saffron petals powderand its blends with activated carbon were used to adsorb methylene blue with various concentrations from water at the above ranges. The Central Composite Design (CCD) under Response Surface Methodology (RSM) was applied to estimate the independent variables effects on the methylene blue adsorption. The optimum conditions for the 96.5% of removal were experimentally found at pH of 10.5, initial methylene blue concentration of 85.9 ppm, saffron petals powder dosage of 7.07 g/l, contact time of 182.05 min and activated carbon dosage of 7.35 g/l while the operating conditions for the maximum removal of 95.3% were experimentally obtained at pH of 10.5, initial methylene blue concentration of 83.1 ppm, saffron petals powder dosage of 7.77 g/l, contact time of 64.7 min and activated carbon dosage of 7.77 g/l. It is concluded that saffron petals powder (as a waste) with activated carbon is able properly adsorb methylene blue.

 

Keywords    Adsorption; Biomass; Methylene Blue; Wastewater

 

چکیده   

متیلن بلو یکی از رنگهای مشهور که نمونه ای از رنگهای مضر است میباشد. در این تحقیق متیلن بلو با استفاده از مخلوطهای پودر گلبرگهای گیاه زعفران بهمراه کربن فعال جذب سطحی شد. پنج متغیر مستقل شامل پی اچ (13-2)، زمان تماس (270-5 دقیقه)، دوز پودر گلبرگهای گیاه زعفران (10-1/0 گرم بر لیتر)، غلظت اولیه محلول متیلن بلو (300-20 پی پی ام) و دوز کربن فعال (10-1/0 گرم بر لیتر) بمنظور جذب سطحی متیلن بلو مطالعه شد.برای این منظور پودر گلبرگهای گیاه زعفران در حالت خالص و بهمراه کربن فعال جهت جذب متیلن بلو با غلظتهای مختلف از آب در بازه های فوق بکار برده شدند. طراحی مرکب مرکزی تحت متد سطح پاسخ جهت پیشبینی اثرات متغیرهای مستقل برروی جذب متیلن بلو بکار گرفته شد.شرایط بهینه برای حذف 5/96% بطور آزمایشگاهی در پی اچ 51/10، غلظت اولیه متیلن بلو 9/85 پی پی ام، دوز پودر گلبرگهای گیاه زعفران 07/7 گرم بر لیتر و زمان تماس 05/182 دقیقه و دوز کربن فعال 35/7 گرم بر لیتر بدست آمد درحالیکه شرایط عملیاتی برای حداکثر حذف 31/95% بطور آزمایشگاهی در پی اچ 52/10، غلظت اولیه متیلن بلو 13/83 پی پی ام، دوز پودر گلبرگهای گیاه زعفران 77/7 گرم بر لیتر و زمان تماس 74/64 دقیقه و دوز کربن فعال 77/7 گرم بر لیتر بدست آورده شد. نتیجه گیری شد که پودر گلبرگهای گیاه زعفران (بعنوان یک ماده دورریز) بهمراه کربن فعال قادر است بنحو شایسته ای متیلن بلو را جذب نماید.

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