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Study of 131I Adsorption Behavior on Nanoporous Silicates Modified with Elements of Ag, Cu, Zn, Ni

Rohani, Ramezan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46774 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Sayf Kordi, Ali Akbar; Sepehrian, Hamid
  7. Abstract:
  8. One of the common methods used for treatment of gaseous radioactive wastes in nuclear waste management is adsorption process. Nanoporous materials have found great utility as sorption media because of their large internal surface area and more adsorption sites than other adsorbents, which caused the increasing attention of researchers to use them in the nuclear waste management. Hence in this study, the surface of nanoporous silicates of SBA-15 and MCM-41 modified with d-block elements of the periodic table such as silver, copper, zinc and nickel by wet impregnation method. After characterization by different techniques such as X-ray diffraction, nitrogen gas porosimetry, Fourier transform infrared spectroscopy and scanning electron microscopy; have been used as adsorbents for gaseous iodine adsorption. To achieve maximum capacity, the effect of parameters of time, temperature and synthesis condition such as calcination after modification were investigated. The adsorption kinetic data were analyzed using reduced-order models and it was found that the first-order kinetic model was the most appropriate model, describing the adsorption kinetics. Adsorption isotherm results were also showed that iodine adsorption rate of nanoporous SBA-15 modified with zinc and copper by wet impregnation method and the nanoporous MCM-41 modified with zinc were 86, 84 and 83, respectively
  9. Keywords:
  10. MCM-41 Mesoporous Silica Nanoparticles ; Wet Impergnation ; Nuclear Waste ; Nanoporous Silica ; D Element ; Iodine Adsorption ; Santa Barbara Amorphous SBA-15 Nanoporous Silica

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