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
,
مجید قهرمان افشار
2
,
میلاد کاظم نژادی
3
,
حسین قاسمی نژاد
4
1 - استادیار، گروه پژوهشی شیمی و فرآیند، پژوهشگاه نیرو، تهران، ایران
2 - استادیار، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
3 - آزمایشگاه شیمی پلیمر، گروه شیمی، دانشکده علوم، دانشگاه گلستان، گرگان، ایران
4 - گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
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.
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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