Kinetics of uranyl ion polymerization in the presence of ammonium hydroxide

• Autorzy: Abdelrazek I. , Zidan W. , Farag H. , Barakat M.
• Języki publikacji: EN

Abstrakty

EN

Kinetics of the polymerization of UO2 2+ ion to UO2[(OH)2UO2]4 2+ in the ammonia-uranyl nitrate system has been studied. The deepening of the color formed with the addition of ammonia made it possible to estimate spectrophotometrically the concentration of the formed UO2[(OH)2UO2]4 2+ ions in the solution at 420.6 nm. The effects of pH, temperature as well as the concentration of uranyl ion have been investigated. The reaction rate equation for the polymerization reaction is presented. Linear dependencies of logarithm of the apparent reaction-rate constant on both pH and the reverse of temperature were observed.

Słowa kluczowe

EN

uranyl ion; hydrolysis; kinetics; polymerization

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2005
• Tom: Vol. 50, nr 2
• Strony: 57--60
• Opis fizyczny: Bibliogr. 14 poz., rys.

Twórcy

autor

Abdelrazek I.

• National Research Center, ETRR-2, Atomic Energy Authority, Inshas, P. O. Box 13759, Cairo, Egypt W. I. Zidan??, M. F. Barakat National Center for Nuclear Safety and Radiation Control, Atomic Energy Authority, Nasr City, P. O. Box 7551, 11762 Cairo

autor

Zidan W.

• National Center for Nuclear Safety and Radiation Control, Atomic Energy Authority, Nasr City, P. O. Box 7551, 11762 Cairo, Egypt, Tel.: [phone], Fax: [phone]

autor

Farag H.

• Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt

autor

Barakat M.

• National Center for Nuclear Safety and Radiation Control, Atomic Energy Authority, Nasr City, P. O. Box 7551, 11762 Cairo, Egypt, Tel.: [phone], Fax: [phone]

Bibliografia

• 1. Ayaz B, Bilge AN (2000) The possible usage of ex-ADU uranium dioxide fuel pellets with low-temperature sintering. J Nucl Mater 280:45−50.
• 2. Ball MC, Birkett CRG, Brown DS, Jayacock MJ (1974) The thermal decomposition of ammonium diuranate. J Inorg Nucl Chem 36:1527−1529.
• 3. Cordfunke EHP (1969) The chemistry of uranium including its applications in nuclear technology. Elsevier Publishing Co., New York.
• 4. Deptula A (1962) A study of composition of ammonium uranates. Nukleonika 7;4:265−274.
• 5. Dot H, Ito T (1964) Significance of physical state of starting precipitate in growth of uranium dioxide particles. J Nucl Mater 11;1:91−106.
• 6. Fogler HS (1999) Elements of chemical reaction engineering. Prentice Hall, New Jersey.
• 7. Hoyt RC (1978) Precipitation kinetics of a continuous precipitator, with application to the precipitation of ammonium polyuranate. PhD thesis. Iowa State University, USA.
• 8. Lemire RJ, Tremaine PR (1980) Uranium and plutonium equilibria in aqueous solutions to 200°C. J Chem Eng Data 25:361−370.
• 9. Murty BN, Balakrishna P, Yadav RB, Ganguly C (2001) Influence of temperature of precipitation on agglom-eration and other powder characteristics of ammonium diuranate. Powder Technol 115:167−183.
• 10. Murty BN, Balakrishna P, Yadav RB, Ganguly C (2003) New approaches in the characterization of uranium dioxide. Mater Charact 49:103−111.
• 11. Rajagopal S, Asari TPS, Iyer CSP (1996) Particle size analysis of ammonium uranate prepared by conventional and homogeneous methods of precipitation and their corresponding oxides. J Nucl Mater 227:300−303.
• 12. Stuart WI, Whateley TL (1969) Composition and structure of ammonium uranates. J Inorg Nucl Chem 31:1639−1647.
• 13. Turcanu CN, Deju R (1979) Thermal analysis of ammonium diuranate. Nucl Technol 45:188−192.
• 14. Vuillemey R (1962) Contribution to the chemical and technological study of ammonium diuranate precipitation. Report CEA 2004. Saclay Nuclear Study Center,France.