ساخت و مشخصه‌یابی نانوذرات ابرپارامغناطیسی منیتیت اصلاح شده با سیانکس272

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشکده ی چرخه ی سوخت هسته ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایران

2 گروه فرآوری مواد معدنی، دانشکده فنی مهندسی، دانشگاه تربیت مدرس، صندوق پستی: 143-14115، تهران ـ ایران

چکیده

نانوذرات ابرپارامغناطیسی منیتیت (4O3Fe) درجا پوشش داده شده با پلی‌اتیلن گلیکول با استفاده از روش هم‌رسوبی شیمیایی به وسیله-ی سدیم هیدروکسید، در محلول‌های اسیدی فروکلرید چهار آبه (O2H4.2FeCl)، و فریک کلرید شش آبه (O2H6.3FeCl)ی محتوی پلی‌اتیلن گلیکول ساخته شدند. شرایط بهینه‌ی رسوب‌گیری نانوذرات منیتیت پوشش داده شده با پلی‌اتیلن گلیکول تعیین شد. نتایج نشان داد که قدرت اسیدی محیط رسوب‌گیری، غلظت سدیم هیدروکسید و مقدار پلی‌مر موجود در محیط تأثیر مهمی بر روی اندازه و ساختار نانوذرات دارند. اندازه و توزیع اندازه، ساختار، و پوشش نانوذرات، به ترتیب، به وسیله‌ی میکروسکوپی الکترون عبوری (TEM) و پراش‌سنجی پرتو ایکس (XRD)، طیف‌سنجی تبدیل فوریه‌ی زیرقرمز (FT-IR)، و تجزیه‌ی گرماوزنی (TGA) مشخص شد. اندازه‌ی نانوذرات لخت، در گستره‌ی 8 تا 28 نانومتر متغییر بود که پس از پوشش‌دهی تغییر قابل توجهی نکرد. بالاخره این‌که اصلاح نانوذرات، با هدف استفاده از آن‌ها به عنوان حاملی جدید برای بازیابی و حذف یون‌های فلزی اورانیم (VI) و توریم (IV) از محلول‌های آبی با مخلوط نمودن نانوذرات با سیانکس272 به مدت تقریباً 1 ساعت انجام و نسبت وزنی مناسب سیانکس به نانوذرات برابر 5/1:7 درنظر گرفته شد.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and characterization of Cyanex 272-modified supeparamagnetic magnetite nanoparticles

نویسندگان [English]

  • Saeid Alamdarmilani 1
  • Ahmad Khodadidarban 2
  • Afshin Shahbazi 2
چکیده [English]

The in-situ polyethylene glycol coated superparamagnetic magnetite (Fe3O4) nanoparticles (SPMNPs) were prepared by a co-precipitation method from the acidic solutions of FeCl2.4H2O and FeCl3.6H2O, containing polyethylene glycol (PEG), using aqueous solution of  NaOH. The optimum coditions of the precipitation of  polymer coated magnetic nanoparticles were determinned.  It was found that the concentration of acid, sodium hydroxid, and polyethylene glycol influenced the size and structure of nanoparticles. The sizes and the size distribution, structure, and coating of  the nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffractometry (XRD), Fourier transform infrared spectrometry (FT-IR) and thermogravimetry analysis (TGA) techniques, respectively. The size of the uncoated nanoparticles was varied in the range of  8-28 nm and after the coating it did not change significantly. Finally, the modification of the particles was carried out simply by mixing the modifiere (Cyanex 272) with nanoparticles powder for a time duration of approximately one hour. The nanoparticle that was treated by Cyanex 272/SPMNPs of weight ratio of 7.5:1 possessed better characteristics for Uranium(VI) and Thorium(IV) recovery from aqueous solutions.

کلیدواژه‌ها [English]

  • Superparamagnetic nanoparticles
  • Magnetite
  • Synthesis and characterization
  • Polyethlen glycol
  • Cyanex 272

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