Loading...

Synthesis of Copper Oxide Nano Particles by Supercritical Hydrothermal Method and Study on Their Adsorption Properties for uptake of Elemental Iodine and Radioactive Ions

Saket Bolgoori, Arezoo | 2011

972 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41359 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Otukesh, Mohammad; Ahmadi, Javad; Samadfam, Mohammad
  7. Abstract:
  8. I-131 isotope is one of the most significant radio medicines for treatments of the thyroid cancer and nuclear tomography of thyroid. As for purification of this radioisotope several methods have been developed among which adsorption-desorption on metallic copper is the most promising. The current study is aimed at elaboration of the kinetics behavior of the different types of metallic copper for adsorption of iodine vapor. The used copper samples included plain and silica-supported Cu nanoparticles as well as micronized copper. The silica-supported Cu nanoparticles were prepared by impregnation of highly porous silica (≈500 m2/g) in Cu(NO3)2 solution, heating of the solution to above critical temperature of water, and reduction of the deposited CuO nanoparticles by a mixture of argon and hydrogen.Iodine in the employed apparatus for the kinetics study system was sublimated and passed through a bed of nano or micronized copper by a hot stream of conveying inert gases (N2 or Ar). Reaction was stopped at different time intervals and the extent of reaction was determined by analysis of the copper specimens using classical titration by iodat (NaIO3). Results indicated that: 1- The rate of reaction had the following order: Supported >> nano powder > micronized; After 1 h extents of progress of reactions were: Supported =95.5 %, nano powder = 37.5% , micronized =25.7%, 2: Uptake kinetics of the iodine by supported Cu nanoparticles was best fitted by a zero order reaction model implying that diffusion has the least role in the sorption mechanism of such sample whose particles were quite dispersed, and its highly porous structure facilitated the diffusion of gases. 3: The significant role of diffusion in the sorption mechanism of micronized sample made the kinetics to obey 3-D diffusion-Jander eqn.(D3). 4: Kinetic behavior of the plain nanoparticles which obeyed 1-D diffusion (D1) model was closer to the behavior of micronized Cu, likely due to the diffusion shielding effect
  9. Keywords:
  10. Kinetics Study ; Solid State ; Supercritical Hydrothermal ; Silica-Supported Cupper Nanoparticles ; Iodine Vapor

 Digital Object List

 Bookmark

No TOC