پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

حذف یون های مس و کروم از محلول‌های آبی با نانوذرات مغناطیسی عامل‌دار شده با N - فسفونو متیل آمینو دی‌استیک اسید

نوع مقاله : پژوهشی اصیل

نویسندگان

محسن اسماعیل پور 1
مجید قهرمان افشار 1
زینب نورورزی تیسه 1
رامین قهرمان زاده 2

1 استادیار، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران

2 استادیار، مرکز تحقیقات نانوتگنولوژی، پژوهشگاه ابن سینا، تهران، ایران

چکیده
آلودگی آب و خاک با فلزات سنگین خطرات و تهدیدهای جدی برای سلامتی بشر و محیط زیست ایجاد می­کند و لذا یافتن راهکاری مؤثر برای حذف این فلزات بسیار لازم و ضروری می­باشد. در این پژوهش ابتدا نانو ذرات مغناطیسی MnFe2O4@SiO2 عامل­دار شده با N- فسفونو متیل آمینو دی­استیک اسید با ساختار هسته-پوسته سنتز شدند. سپس خصوصیات گروه‌های عاملی سطحی، ساختار کریستالی، خواص مغناطیسی، اندازه و مورفولوژی سطحی این نانوذرات با بکارگیری آنالیزهای طیف­سنجی مادون قرمز تبدیل فوریه (FT-IR)، پراش اشعه ایکس (XRD)، میکرسکوپ الکترونی عبوری (TEM) میکرسکوپ الکترونی روبشی (FE-SEM)، آنالیز توزین حرارتی (TGA) و مغناطیس­سنج نمونه مرتعش (VSM) مورد بررسی و شناسایی قرار گرفتند. نهایتاً بررسی کارایی این نانوجاذب سنتزی در حذف یون­های مس و کروم از محلول­های آبی مورد بررسی و ارزیابی قرار گرفت. اثر پارامترهای مختلف همچون اثر pH، مقدار جاذب و زمان تماس بر میزان جذب یون­های مس و کروم از محلول بررسی گردید. نتایج نشان می­دهد که با افزایش میزان pH از 5/2 تا 5 میزان جذب دو یون فلزی مس (II) و کروم (VI) به طور چشمگیری افزایش می­یابد و بالاترین راندمان جذب در pH برابر 7 حاصل شد. میزان R در نمودار جذب فرندلیچ یون مس نسبت به ایزوترم لانگمویر بیشتر است و در نتیجه جذب یون مس بر روی جاذب از معادله جذب فرندلیچ تبعیت می­کند. همچنین میزان R در نمودار جذب فرندلیچ برای یون کروم نسبت به ایزوترم لانگمویر بیشتر می­باشد و از اینرو جذب یون­های کروم بر روی جاذب از معادله جذب فرندلیچ پیروی می­کند. همچنین در معادله فرندلیچ میزان nبالا نشان­دهنده جذب مطلوب و مؤثر می­باشد. علاوه بر این بررسی ایزوترم­های جذب نشان می­دهد که جذب فلزات کروم و مس از دو مدل لانگمویر و فرندلیچ پیروی می­کند. همچنین قابلیت بازیافت و استفاده مجدد جاذب در چرخه متوالی جذب-واجذب با بکارگیری یک مگنت مغناطیسی مورد بررسی قرار گرفت و نتایج نشان می­دهد که کاهش قابل توجهی در فعالیت جاذب مشاهده نمی­شود.

کلیدواژه‌ها

نانوذرات MnFe2O4@SiO2
فسفونو متیل آمینو دی‌استیک اسید
نانوجاذب مغناطیسی
حذف مؤثر
یون‌های فلزی سنگین

موضوعات

عنوان مقاله English

Removal of copper and chromium ions from aqueous solutions with magnetic nanoparticles functionalized with N-phosphonomethyl amino diacetic acid

نویسندگان English

Mohsen Esmaeilpour 1
Majid Ghahraman Afshar 1
Zeinab Noroozi Tisseh 1
Ramin Ghahremanzadeh 2
1 Assistant Professor, Chemical and Process Engineering Department, Niroo Research Institute (NRI), Tehran, Iran
2 Assistant Professor, Nanobiotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
چکیده English

Contamination of water and soil with heavy metals poses serious risks and threats to human health and the environment, and therefore finding an effective solution to remove these metals is very necessary. In this research, magnetic nanoparticles MnFe2O4 @ SiO2 functionalized with N-phosphonomethyl aminodiacetic acid with core-shell structure were synthesized. These nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, (TGA) thermal gravimetric analysis, transmission electron microscope (TEM), and (VSM) vibration sample magnetometer. The performance of this synthetic nanoadsorbent for removing Cr (VI), Cu (II) ions from aqueous solutions was evaluated by various parameters such as adsorbent amount, contact time effect on adsorption rate and pH effect. The results show that the adsorption efficiency increases with raising pH (2.5-5) and the best adsorbent performance in the adsorption process of Cr ((VI) and Cu (II) ions at pH 7 was observed. The amount of R in the Freundlich adsorption diagram of copper ion is higher than the Langmuir isotherm. As a result, the adsorption of copper ions on the adsorbent follows the Freundlich adsorption equation. In addition, the amount of R in the Freundlich adsorption diagram for chromium ion is higher than the Langmuir isotherm. Therefore, the absorption of chromium ions on the adsorbent follows the Freundlich adsorption equation. In conclusion, a high n value indicates a favorable and effective absorption in the Freundlich equation. The adsorption data were analyzed by the Langmuir and Freundlich isotherm model. In addition, the recyclability and reuse of the adsorbent was investigated. The results show that no significant reduction in adsorbent activity is observed.

کلیدواژه‌ها English

Nanoparticle
MnFe2O4@SiO2
Phosphonomethyl Aminodiacetic acid
Magnetic Nanoadsorbent
Ion Removal
Heavy metal Ion
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