IJE TRANSACTIONS B: Applications Vol. 32, No. 2 (February 2019) 191-197    Article in Press

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

Abstract    In the present 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 and Transmission Electron Microscopy (SEM, TEM), 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. Results illustrated that dye removal percentage was reduced with incrementing of solution pH 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 better fit with adsorption data. The thermodynamic study was indicated that the adsorption process was spontaneous and exothermic. Results confirmed that FHAp adsorbent possess the potential to be used as a suitable candidate for Acid Blue 25 Dye removal from aqueous solutions.


Keywords    hydroxyapatite; dye removal; adsorbtion; nanoporous


چکیده    هدف از این تحقیق، سنتز یک نانوجاذب کارآمد برای حذف رنگ از محلول آبی در یک سیستم ناپیوسته می­باشد. به این منظور، هیدروکسی­آپاتیت سنتز و با استفاده از تترا اتیلن پنتامین عامل­دار گردید. شکل­شناسی، اندازه ذرات و مشخصات ساختاری نانوجاذب به وسیله آنالیز میکروسکوب الکترونی روبشی، جذب-واجذب گاز نیتروژن و پراش اشعه ایکس مورد بررسی قرار گرفت. همچنین ساختار مولکولی و عناصر موجود در نمونه­ها با استفاده از آنالیز جذب اشعه مادون قرمز و پراش انرژی پرتو ایکس مشخص شد. در مرحله بعد، کارایی نانوجاذب سنتز شده در حذف رنگ اسید بلو 25 از محلول آبی با استفاده از سیستم نا­پیوسته مورد بررسی قرارگرفت. 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 بیشترین مقدار جذب در pH برابر 2، دمای 25 درجه سانتی­گراد و با مقدار 10 میلی­گرم از نانوجاذب به دست آمد. درصد حذف رنگ اسید بلو 25 در شرایط بهینه، محلول حاوی غلظت اولیه رنگ 40 میلی گرم در لیتر با استفاده از 10 میلیگرم جاذب در دمای 25 درجه سانتیگراد، 88% بوده که درصد قابل قبولی است. مطالعه تعادلی جذب نشان داد که جذب رنگ اسید بلو 25 توسط نانو جاذب هیدروکسی­آپاتیت عامل­دار شده از مدل ایزوترم فروندلیچ پیروی می­کند. داده­های تجربی با مدل­های سینتیکی شبه درجه اول، شبه درجه دوم و مدل نفوذ درون ذره­ای آنالیز شدند و مدل شبه مرتبه دوم همبستگی بالایی با داده­های تجربی داشتند. مطالعات ترمودینامیکی نیز نشان­دهنده گرمازا و خودبخودی بودن فرآیند جذب بوده است. نتایج نشان داد که جاذب FHAp می تواند به عنوان یک کاندید مناسب برای حذف اسید آبی 25 از محلول های آبی باشد.

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