سنتز و تعیین مشخصه نانوذرات هسته-پوسته مغناطیسی تزئین شده با مولکول تئوفیلین به عنوان یک جاذب مؤثر در حذف یون¬های روی از نمونه‌های آبی

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

محسن اسماعیل پور ¹ , میلاد کاظم نژادی ² , مجید قهرمان افشار ^{3 *} , حسین قاسمی نژاد ⁴

1 - گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
2 - آزمایشگاه شیمی پلیمر، گروه شیمی، دانشکده علوم، دانشگاه گلستان، گرگان، ایران
3 - گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
4 - گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران

تاریخ دریافت : 1404/02/04 تاریخ پذیرش : 1404/03/19 تاریخ انتشار : 1404/03/19

کلید واژه:

چکیده مقاله :

مقدمه: در پژوهش حاضر نانوذرات Fe₃O₄ با استفاده از روش همرسوبی سنتز  گردید. در ادامه به دلیل فعالیت سطحی بالای نانوذرات Fe₃O₄  و قابلیت انحلال ان در محیط های اسیدی، سطج نانوذرات با لایه سیلیکا پوشش داده شد و ذرات هسته- پوسته Fe₃O₄@SiO₂ حاصل گردید. در ادامه نانوذرات هسته-پوسته با ترکیبات آلی و مولکول­های تئوفیلین عاملدار گردید. در نهایت نانوذرات عاملدار شده با تئوفیلین  به عنوان یک جاذب مؤثر در راستای جذب یون­های روی از محلول­های آبی مورد استفاده قرار گرفتند.

روش: تعیین مشخصه، اندازه و مورفولوژی نانوذرات سنتزی با استفاده از آنالیزهای 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. در ادامه نانوذرات سنتز شده به عنوان جاذب استخراج یون روی ازمحلولهای آبی بکار گرفته شد و پارامترهای موثر بر جذب یون هدف بهینه‌سازی گردید.

یافته ­ها: بیشینه ظرفیت جذبی نانوجاذب با استفاده از 60 میلی­لیتر محلولروی با غلظت اولیه mg/L32.7، 21 میلی­گرم نانوجاذب در 7 pH و مدت زمان تماس 25 دقیقه در دمای محیط استفاده حاصل گردید. علاوه بر این نانوجاذب سنتزی قابلیت بازیافت و استفاده مجدد در چرخه­های متوالی جذب-واجذب برای 7 مرتبه را بدون کاهش جدی در فعالیت جذبی را دارا می­باشد.

نتیجه­ گیری: بر اساس نتایج بدست آمده و با توجه به خواص ایده ال نانو جاذب سنتزی به شرح ظرفیت جذب بالا و همچنین قابلیت بازیابی و استفاده مجدد، کاربرد این نانو جاذب در نمونه‌های حقیقی آب و پساب به منظور حذف یون فلزات سنگین پیشنهاد می‌گردد.

چکیده انگلیسی:

Introduction: In the present study, Fe₃O₄ nanoparticles were synthesized using the co-precipitation method. Subsequently, due to the high surface activity of Fe₃O₄ nanoparticles and their solubility in acidic media, the surface of the nanoparticles was coated with a silica layer and core-shell particles of Fe₃O₄@SiO₂ were obtained. Subsequently, the core-shell nanoparticles were functionalized with organic compounds and theophylline molecules. 

Methods: The characteristics, size and morphology of the synthesized nanoparticles were determined using Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen gas adsorption-desorption, vibrating sample magnetometer, thermal weighing analysis, scanning electron microscopy, transmission electron microscopy and particle size distribution. Subsequently, the synthesized nanoparticles were used as an adsorbent for the extraction of zinc ions from aqueous solutions and the parameters affecting the adsorption of the target ion were optimized.

Findings: The maximum adsorption capacity of the nanoadsorbent was achieved using 60 ml of zinc solution with an initial concentration of 0.5 mmol/L, 21 mg of nanoadsorbent at pH 7 and a contact time of 25 minutes at ambient temperature. In addition, the synthetic nanoadsorbent has the ability to be recycled and reused in consecutive adsorption-desorption cycles for 7 times without serious reduction in adsorption activity.

Conclusion: Based on the results and considering the ideal properties of the synthetic nanoadsorbent such as high adsorption capacity and the ability to recover and reuse, the use of this nanoadsorbent in real water and wastewater samples for the removal of heavy metal ions is highly recommended.

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