نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده نفت و مهندسی شیمی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، صندوق پستی 775-14515، تهران ایران

2 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران

10.24200/nst.2022.1443

چکیده

در این تحقیق، ابتداسطوح مزو حفره سیلیسی کروی 15SBA- با ترکیب پتاسیم مس هگزاسیانوفرات (](6[KCu(Fe(CN)) اصلاح شد. سپس از آن به عنوان یک مبادله‌گر یونی نانوکامپوزیتی جدید، جهت جذب سزیم از محلول آبی مورد استفاده قرار گرفت. شناسایی ساختار نانوکامپوزیت سنتز شده با تکنیک‌‌های میکروسکوپ الکترونی روبشی نشر میدانی (FESEM)، پراش پرتو ایکس(XRD)، جذب و واجذب نیتروژن (BET) و طیف‌سنجی مادون قرمز(IR) مورد ارزیابی قرار گرفت. اثر پارامترهای pH، زمان تماس و غلظت بر میزان جذب مورد مطالعه قرار گرفت. داده‌‌های غلظت تعادلی با مدل‌‌های لانگمویر، فروندلیچ و تمکین بررسی شد. نتایج ارزیابی‌ها مطابقت خوبی با مدل لانگمویر داشت که نشان می‌داد فرایند جذب یون‌‌های سزیم به صورت تک لایه است. هم‌چنین مدل شبه مرتبه دوم مدل مناسبی برای توصیف رفتار سینتیکی جذب سزیم بود. بیشینه ظرفیت جذب تعادلی برای این نانوکامپوزیت 4/46 میلی‌گرم بر گرم نانوکامپوزیت به دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Layer by layer modification of mesoporous silica surfaces with potassium copper hexacyanoferrate compound and its cesium ion adsorption behavior

نویسندگان [English]

  • Sh. Amin 1
  • S.A. Alavi 1
  • H. Yousefnia 2
  • H. Aghayan 2

1 Faculty of Oil and Chemical Engineering, Science and Research Branch, Islamic Azad University, P.O. Box: 14515-775, Tehran, Iran

2 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box:11365-8486, Tehran-Iran

چکیده [English]

In this work, the surfaces of spherical mesoporous silica were modified with potassium copper hexacyanoferrate ([KCu(Fe(CN)6)]), then employed as a new ion exchanger nanocomposite to adsorb cesium ion from an aqueous solution. The materials have been characterized by Field EmissionScanning Electron Microscopy (FESEM), X-ray diffraction (XRD), N2 adsorption-desorption isotherms (BET), and FTIR spectroscopy. The effect of contact time, pH, and initial concentration of the solution on adsorption efficiency were studied. Langmuir, Freundlich, and Tempkin's isotherm models analyzed the equilibrium concentration data. The data was in good agreement with the Langmuir model showing cesium adsorption process was a monolayer. The pseudo-second-order model was adequate to describe cesium uptake kinetic behavior, and the maximum equilibrium adsorption capacity for the nanocomposite was 46/4 (mg/g).
 

کلیدواژه‌ها [English]

  • Cesium
  • Hexacyanoferrate
  • Spherical SBA-15
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