IJE TRANSACTIONS B: Applications Vol. 32, No. 2 (February 2019) 193-200    Article in Press

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F. Darvishalipour, H. Ghafouri Taleghani, M. Ghorbani and H. Salimi Kenari
( Received: October 02, 2018 – Accepted in Revised Form: January 03, 2019 )

Abstract    In this study, nanoporous hydroxyapatite was synthesized and functionalized via tetraethylenepentamine in order to obtain a novel adsorbent for efficient removal of Acid Blue 25 dye from aqueous solution. Functionalized hydroxyapatite was characterized by Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and N2 adsorption-desorption. Batch adsorption studies were performed to investigate the effect of various parameters such as pH, initial dye concentration, adsorbent dosage, contact time and temperature. The results illustrated that dye removal percentage was reduced with incrementing pH of the solution and dye concentration. Maximum removal of Acid Blue 25 in the solution having an initial dye concentration of 40 mg/L using 10 mg of adsorbent at 25 °C was 88%. Experimental kinetic data obeyed the pseudo second order model was appointed in 180 min. The Freundlich isotherm model also represented a suitable fit with adsorption data. The thermodynamic study was indicated that the adsorption process was spontaneous and exothermic. Results confirmed that FHAp adsorbent possesses the potential to be used as a suitable candidate for Acid Blue 25 Dye removal from aqueous solutions.


Keywords    hydroxyapatite; dye removal; adsorbtion; nanoporous



هدف از این تحقیق، سنتز یک نانوجاذب کارآمد برای حذف رنگ از محلول آبی می¬باشد. برای این منظور، هیدروکسی¬آپاتیت سنتز و با استفاده از تترا اتیلن پنتامین عامل¬دار گردید. شکل¬شناسی، اندازه ذرات و مشخصات ساختاری نانوجاذب به وسیله آنالیز اسپکتروسکوپی مادون قرمز فوریه، پراش اشعه ایکس، میکروسکوب الکترونی روبشی، پراش انرژی پرتو ایکس و جذب-واجذب گاز نیتروژن مورد بررسی قرار گرفت. در مرحله بعد عوامل مؤثر بر حذف رنگ اسید بلو 25، از قبیل pH محلول، غلظت اولیه رنگ در محلول، میزان جاذب، دما و زمان تماس ارزیابی شد. نتایج نشان داد که درصد حذف رنگ با افزایش pH و غلظت رنگ محلول کاهش می‌یابد. حداکثر حذف رنگ اسید آبی 25 در محلول حاوی غلظت اولیه رنگ 40 میلی گرم در لیتر با استفاده از 10 میلی‌گرم جاذب در دمای 25 درجه سانتیگراد 88 درصد بود. مطالعه تعادلی و سینتیکی جذب نشان داد که جذب رنگ اسید بلو 25 توسط نانو جاذب هیدروکسی¬آپاتیت عامل¬دار شده از مدل ایزوترم فروندلیچ و مدل سینتیکی شبه درجه دوم پیروی می¬کند. مطالعات ترمودینامیکی نیز نشان¬دهنده گرمازا و خودبخودی بودن فرآیند جذب بوده است. نتایج بیان می‌نماید جاذب FHAp به عنوان یک کاندید مناسب برای حذف اسید آبی 25 از محلول های آبی مورد استفاده قرار گیرد.


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