مهندسی شیمی ایران

مهندسی شیمی ایران

نانوذرات هسته- پوستۀ مغناطیسی Fe3O4@SiO2 عاملدارشده با بیس سالوفن لیگاند بهعنوان یک جاذب مؤثر و قابل بازیافت به منظور حذف کادمیوم دوظرفیتی از محلولهای آبی

نوع مقاله : مقاله پژوهشی

نویسندگان
استادیار شیمی، پژوهشگاه نیرو
چکیده
در این پژوهش، نانوذرات هسته- پوستۀ مغناطیسی جدید Fe3O4@SiO2/Schiff base سنتز و به ­منظور حذف یون­های کادمیوم دوظرفیتی از محلول­های آبی، استفاده شد. در ابتدا نانوذرات اکسید آهن با روش هم­رسوبی سنتز شد، سپس به‌روش استوبر با سیلیکای پوششی و بااستفاده‌از تترااتوکسی‌سیلان ساختار هسته- پوستۀ Fe3O4@SiO2 از نانوذرات اکسید آهن تشکیل شد. در ادامه، پس‌از عامل‌دارشدن نانوذرات هسته- پوسته با 3- کلروپروپیل (تری­اتوکسی) سیلان، مولکول سنتزی پارا- بیس ](3و4- سالسیلیک ایمینو) بنزوفن ایمین[ برروی این نانوذرات ساپورت شد و ترکیب نهایی Fe3O4@SiO2/Schiff base سنتز شد. خصوصیات گروه­های عاملی سطحی، ساختار بلوری، خواص مغناطیسی، اندازه و ریخت‌شناسی سطحی این نانوذرات با به‌کارگیری آنالیزهای مادون ‏قرمز تبدیل ‏فوریه (FT-IR)، پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی (FE-SEM)، میکروسکوپ الکترونی عبوری (TEM)، مغناطیس­سنج نمونه مرتعش (VSM) و پراش انرژی پرتو ایکس (EDX) بررسی و شناسایی شدند. سپس، مطالعات سینتیکی و تأثیر مقادیر مختلف جاذب به­منظور حذف یون­های کادمیوم دوظرفیتی از محلول­های آبی، بررسی شد، که نتایج مقدار جذب بیشینه 92% را در دمای محیط نشان می­دهد. هم‌چنین تأثیر pH بر میزان جذب در دامنۀ 8-3 نشان می ­دهد که با افزایش میزان pH مقدار جذب کادمیوم دوظرفیتی افزایش می­ یابد و بیشینۀ عملکرد جذبی در شرایط با 7=pH مشاهده شد. علاوه‌بر این، واجذب یون­های کادمیوم با به‌کارگیری محلول HCl انجام گرفت که قابلیت بازیافت و بازاستفاده و مؤثرFe3O4@SiO2-Schiff base  در فرایندهای متوالی جذب را امکان‌پذیر می­ سازد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Preparation, Characterization, and Adsorption Properties of Bis-Salophen Schiff Base Ligand Immobilized on Fe3O4@SiO2 Nanoparticles for Removal of Cadmium (II) from Aqueous Solutions

نویسندگان English

M. Esmaeilpour
M. Ghahraman Afshar
Assistant Professor of Chemistry, Niroo Research Institute (NRI)
چکیده English

Here in this research, a novel Fe3O4@SiO2/Schiff base nanoparticles was developed, aiming to remove Cd(II) ions from aqueous media. At first, iron oxide nanoparticles were synthesized by co-precipitation method, then Fe3O4@SiO2 core-shell structure was formed from iron oxide nanoparticles by Stöber method with coating silica and using tetraethoxysilane as a silica source. Afterwards,the core-shell nanoparticles were functionalized with 3-chloropropyl (triethoxy)silane, the synthetic molecule para-bis[(3,4-salicylicimino) benzophenimine] was supported on these nanoparticles and the final composition of Fe3O4@SiO2/Schiff base was synthesized. The properties of surface functional groups, crystal structure, magnetism and surface morphology of magnetic nanoparticles were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy(FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and energy dispersive X-ray analysis (EDX). Then, the adsorption kinetics and the effects of synthetic nanoadsorbents dosage on
the removal of divalent cadmium ions were investigated that the results show the maximum absorption value of 92% at the ambient temperature. Also, the effect of pH on the amount of absorption in the range of 3-8 shows that the absorption of cadmium(II) increases with increasing pH and the maximum adsorption performance was observed at pH=7. Furthermore, the desorption of Cd(II) ions was done effectively using HCl solution, thereby proving that Fe3O4@SiO2-Schiff base can be regenerated and reused effectively for further process of removal.

کلیدواژه‌ها English

Fe3O4@SiO2 NPs
Bis-Salophen Schiff Base Ligand
Adsorption Kinetics
Cadmium Ions
Magnetic Separation
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