حذف جذبی رادیونوکلوئیدهای 90Sr و 137Cs از پسماند مایع پرتوزای راکتور تحقیقاتی تهران به وسیله‌ی نانوذرات تیتانوسیلیکات آلاییده شده با Nb و Ge

نوع مقاله: مقاله پژوهشی

نویسندگان

پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران

چکیده

 نانوذرات تیتانوسیلیکات آلاییده شده با Nb و Ge، به روش آب- گرمایی ساخته شده و توانایی آن‌­ها در حذف رادیونوکلوئیدهای 90Sr و 137Cs از پسماند­ مایع پرتوزای راکتور تحقیقاتی تهران در روش ناپیوسته ارزیابی شد. فاز بلوری و ریخت‌­شناسی نمونه­‌های ساخته شده، به ترتیب با استفاده از پراش­‌سنجی پرتو ایکس (XRD) و میکروسکوپ الکترون پویشی (SEM) بررسی شد. تجزیه­‌ی عنصری نمونه‌­های جاذب با استفاده از فلوئورسانی پرتو ایکس (XRF) به انجام رسید. مساحت سطح نمونه­‌های ساخته شده، با استفاده از جذب و واجذب نیتروژن
(­BET) اندازه‌­یابی شد. اثر پارامترهای دما، زمان ماند و pH پسماند بر میزان حذف رادیونوکلوئیدهای 90ُSr و 137Cs بررسی شد. یافته‌­ها نشان داد که نمونه­‌های ساخته شده، از توانایی خوبی برای جذب این رادیونوکلوئیدها از پسماند مایع پرتوزای راکتور تحقیقاتی تهران و به طور کلی آمایش پسماندهای مایع برخوردارند. نمونه­‌های تیتانوسیلیکات آلاییده شده تا 25 درصد وزنی با درصد­های وزنی مساوی (­50%) از Nb و Ge، تقریباً ­98.5% از 137Cs و 86.3% از 90Sr را از پسماند حذف کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Adsorptive Removal of 90Sr and 137Cs Radionuclides by Nb-Ge Doped Titanosilicate Nanoparticles from Liquid Radioactive Waste of Tehran Research Reactor

نویسندگان [English]

  • S A. Milani
  • B Maraghe Mianji
چکیده [English]

The Nb-Ge doped titanosilicate nanoparticles were synthesized using a hydrothermal method and their adsorptive behavior for 90Sr and 137Cs radionuclides was investigated in liquid radioactive waste of Tehran research reactor in a batch method. Crystalline phases and morphology of the synthesized samples were studied by X-ray diffraction (XRD) method and scanning electron microscopy (SEM) technique, respectively. Elemental analyses of the samples were performed using X-ray fluorescence (XRF) technique. Surface areas of the samples were measured by the BET method. The effects of  temperature, contact time, and pH of liquid radioactive waste were studied. The obtained results showed that the synthesized samples have a good potential for removal of Sr-90 and Cs-137 radioisotopes from liquid radioactive waste of Tehran research reactor and in general, for the liquid wastes treatment. The samples doped up to 25 wt% with equal amounts (50 wt%) of niobium and germanium, removed almost 98.5% of  137Cs and 86.3% of  90Sr from liquid radioactive waste of Tehran research reactor.

کلیدواژه‌ها [English]

  • Doped Titanosilicate
  • Nb-Ge
  • Nanoparticles
  • Adsorptive Removal
  • 90Sr and 137‌Cs

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