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Recovery of Uranium(VI) from UCF Waste by Selective Transportacross Aliquid Membrane

Soltani Behrouz, Masoud | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43719 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Samadfam, Mohammad; Fasihi, Javad
  7. Abstract:
  8. Due to environmental and economical impacts, recovery of the uranium from nuclear wastes is of continuing interest.This work reports the separation of uranyl ionusing transport technique through chloroform liquid membrane containing a mixture of DBDA15C4 and oleic acidas cooperative carrier.The pH of the feed phase (10-4 M of UO22+) was adjusted with nitric acid and acetic acid/NaOH for pHrange of 2-6.The receiving phase was hydrochloric acid 1M.The organic phase was chloroform which includesthe carrier DBDA15C4 (0.0001 M) and also the oleic acid (0.015M).The results showed that the transport increased with increasing pH and reached to maximumat pH of 5.Maximum cooperative effect of oleic acid/DBAA15C4 was observed at mole ratio of 15. Phase equilibra could be achieved within about 3h and 30 minutes. Stoichiometric cooperation of each reagent (UO2.AzaCrown.OLeate2) was obtained by fitting the experimental data to equilibrium equations. First order kinetic model was in agreement with concentration changes of uranium in the different phases.It was found that kinetic constant in the feed/membrane interface(kf=0.000284S-1)is greater than that of membrane/receiving interface(ke = 0.000262S-1). Finally, effect of foreign ions such as Cu2+, Pb2+ and Zn2+and Th4+ on transport of uranyl ion was investigated.

  9. Keywords:
  10. Oranium ; Oleic Acid ; Azacrown ; Uranium Separation ; Selective Transport ; Bulk Liquid Membrane

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