Preparation and characterization of tri-n-octylamine microcapsule (TOA-MC) used for selective separation of Re(VII) [chemical analogs of Tc(VII)] in the high level liquid radioactive waste (HLLW)
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TOA-MC was developed to act as absorbent for selective separation of 99Tc(VII) from high-level radioactive liquid waste. The uptake (%) of Re(VII) a substitute for Tc(VII) due to similar chemical behavior by TOA-MC normally exceeding 95% in the presence of dilute HNO3 was strongly retained and decreased with higher HNO3 concentration by batch method. The surface morphology, thermal stability and diameter/size distribution of the microcapsules were examined by scanning electron microscopy, thermogravimetric analysis and digital microscope, respectively. The chemical structure was characterized using Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy.
Keywords99Tc Sodium alginate Tri-n-octylamine microcapsule (TOA-MC) High level radioactive liquid waste (HLLW)
This work was financially supported by internship funding of Institute of Nuclear Energy Research (INER) under Project No. A7106-2001. The authors gratefully acknowledge the kind assistance of the Department of Quantum Science & Energy Engineering at the Tohoku University. The authors would like to express their appreciation to Dr. Masud Rana Syed (AEC, Bangladesh) for his helpful discussions on TOA-MC experiments as well as Mr. Xiang-Biao Yin (Tokyo Institute of Technology) and Mr. Jing-Feng Wang (INER) for their assistance in FTIR, TGA and SEM/EDS operations. The authors also would also like to thank Dr. Chang Yu (INER) for his helpful discussion on NMR.
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