شیمى کاربردى روز

شیمى کاربردى روز

نانوجاذب مغناطیسی عامل‌دار شده با تئوفیلین: سنتز، تعیین مشخصه، استخراج فاز جامد مس، مدلسازی سینیتیک و ایزوترم جذب

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 استادیار، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
2 1گروه شیمی، دانشگاه پیام نور، تهران، ایران
3 گروه شیمی، دانشگاه پیام نور، تهران، ایران
چکیده
در این پژوهش نانوذرات هسته-پوسته Fe3O4@SiO2 عامل‌دار شده با مولکول‌های تئوفیلین سنتز و به عنوان یک نانوجاذب مؤثر و قدرتمند به منظور حذف یون‌های مس دوظرفیتی از محلول‌های آبی مورد استفاده قرار گرفتند. بررسی و ارزیابی مراحل سنتزی و ساختاری نانوجاذب، ریخت‌شناسی و اندازه ذرات با استفاده از روش‌هایی نظیر طیف‌سنجی مادون قرمز تبدیل فوریه، پراش اشعه ایکس، جذب-واجذب گاز نیتروژن، مغناطیس‌سنج نمونه مرتعش، آنالیز توزین حرارتی، میکروسکوپ الکترونی روبشی، میکروسکوپ الکترونی عبوری و توزیع اندازه ذرات انجام گرفت. به منظور ارزیابی عملکرد جذب نانوجاذب در حذف یون‌های مس از محلول، در ابتدا بهینه‌سازی دوز جاذب، pH محلول، غلظت اولیه یون مس و زمان تماس جاذب مورد بررسی قرار گرفت و نتایج نشان‌دهنده بهترین عملکرد جذب در حضور mg21 نانوجاذب سنتزی، 7 pH در mL75 محلول باغلظت اولیه mmol/L 0.55 در دمای محیط و مدت زمان تماس min20 می‌باشد. ایزوترم جذب از مدل لانگمویر تبعیت می‌کند که منجر به ماکزیمم ظرفیت جذب یون‌های مس به میزان mg/g 134.7 می‌شود. پارامترهای محاسبه شده نشان‌دهنده تطابق داده‌های جذب سینتیکی با مدل جذب سینتیکی شبه مرتبه دوم می‌باشد که مؤید آن است که جذب شیمیایی مرحله اصلی تعیین سرعت بوده است. همچنین این جاذب سنتزی قابلیت بازیابی با میدان مغناطیسی و استفاده مجدد در چرخه‌های متوالی جذب-واجذب برای هفت مرتبه بدون کاهش محسوس در فعالیت جذبی را دارا می‌باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Theophylline-functionalized magnetic nanoadsorbent: synthesis, characterization, solid phase extraction of copper, modeling of isotherms and adsorption kinetics

نویسندگان English

Majid Ghahraman Afshar 1
Parvin Barashroudi 2
Niloufar Bahramipanah 2
Abbas Maleki 3
1 . Assistant Professor, Chemistry and Process Research Department, Niroo Research Institute (NRI), Tehran, Iran
2 Department of Chemistry, Payame Noor University (PNU), Tehran, Iran
3 1Department of Chemistry, Payame Noor University (PNU), Tehran, Iran
چکیده English

In this study, Fe3O4@SiO2 core-shell nanoparticles functionalized with theophylline molecules were synthesized and used as an effective and strong nanoadsorbent for the removal of divalent copper ions from aqueous solutions. The synthetic and structural steps of the nanoadsorbent, morphology and particle size were investigated using techniques such as Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen gas adsorption-desorption, vibrating sample magnetometer, thermal analysis, scanning electron microscopy, transmission electron microscopy and particle size distribution. In order to evaluate the adsorption performance of nanadosorbent in removing copper ions, initially the optimization of nanoadsorbent dosage, solution pH, initial copper ion concentration and nanoadsorbent contact time were investigated and the results showed the best adsorption performance in the presence of 21 mg of synthetic nanoadsorbent, pH 7 in 75 mL of solution with initial concentration of 0.55 mmol/L at ambient temperature and contact time of 20 min. The adsorption isotherm followed the Langmuir model which resulted in a maximum adsorption capacity of copper ions of 134.7 mg/g. The calculated parameters indicated that the kinetic adsorption data were in well agreement with the pseudo-second-order kinetic adsorption model. This data confirmed that the chemisorption was the main rate-determining step. This synthetic nanoadsorbent is recovered with a magnetic field and reused in consecutive adsorption-desorption cycles for seven times without a noticeable decrease in adsorption activity.

کلیدواژه‌ها English

Surface adsorption
copper ion
core-shell structure
Fe3O4@SiO2
theophylline molecule
Langmuir model
Freundlich model
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