View More View Less
  • 1 Department of Chemistry, Faculty of Science and Arts, Pamukkale University, 20070, Denizli, Turkey
Restricted access

Abstract

The thermal decomposition kinetics of UO2C2O4·3H2O were studied by TG method in a flowing nitrogen, air, and oxygen atmospheres. It is found that UO2C2O4·3H2O decomposes to uranium oxides in four stages in all atmosphere. The first two stages are the same in the whole atmosphere that correspond to dehydration reactions. The last two stages correspond to decomposition reactions. Final decomposition products are determined with X-Ray powder diffraction method. Decomposition mechanisms are different in nitrogen atmosphere from air and oxygen atmosphere. The activation energies of all reactions were calculated by model-free (KAS and FWO) methods. For investigation of reaction models, 13 kinetic model equations were tested and correct models, giving the highest linear regression, lowest standard deviation, and agreement of activation energy value to those obtained from KAS and FWO equations were found. The optimized value of activation energy and Arrhenius factor were calculated with the best model equation. Using these values, thermodynamic functions (ΔH*, ΔS*, and ΔG*) were calculated.

  • 1. Duvieubourg, L, Nowogrocki, G, Abraham, F, Grandjean, S 2005 Hydrothermal synthesis and crystal structures of new uranyl oxalate hydroxides: α- and β-[(UO2)2(C2O4)(OH)2(H2O)2] and [(UO2)2(C2O4)(OH)2(H2O)2]·H2O. J Solid State Chem. 178:34373444 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 2. Aybers, MT 1998 Kinetic study of the thermal decomposition of thorium oxalate dehydrate. J Nucl Mater. 252:2833 .

  • 3. Dollimore, D, Jones, LF, Nicklin, T, Spooner, P 1973 Thermal decomposition of oxalates. Part 13. Surface area Changes in the thermal decomposition of uranyl oxalate. J Chem Soc Faraday Trans. 69 1 18271833.

    • Search Google Scholar
    • Export Citation
  • 4. Tel, H, Bülbül, M, Eral, M, Altaş, Y 1999 Preperation and characterization of uranyl oxale powders. J Nucl Mater 275:146150 .

  • 5. Dahale, ND, Chawla, KL, Jayadevan, NC, Venugopal, V 1997 X-ray, thermal and infrared spectroscopic studies on lithium and sodium oxalate hydrate. Thermochim Acta 293:163166 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 6. Dahale, ND, Chawla, KL, Venugopal, V 2000 X-ray, thermal and infrared spectroscopic studies on potassium, rubidium and caesium uranyl oxalate hydrate. J Therm Anal Calorim 61:107117 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 7. Rodante, F, Vecchio, S, Materazzi, S, Vasca, E 2003 Kinetic and thermodynamic study of the Na4(UO2)2(OH)4(C2O4)2 complex. Int J Chem Kinet. 35:661 .

  • 8. Ozawa, T 1970 Kinetic analysis of derivative curves in thermal analysis. J. Thermal Anal 2:301 .

  • 9. Küçük, F, Yildiz, K 2006 The decomposition kinetics of mechanically activated alunite ore in air atmosphere by thermogravimetry. Thermochim Acta 448:107110 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 10. Cilgi, GK, Cetişli, H 2009 Thermal decomposition kinetics of aluminum sulfate hydrate. J Therm Anal Calorim 98:855861 .

  • 11. Boonchom, B 2009 Kinetic and thermodynamic studies of MgHPO4·3H2O by non-isothermal decomposition data. J Therm Anal Calorim 98:863871 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 12. Ocakoğlu, K, Emen, FM 2011 Thermal analysis of cis-(dithiocyanato) (1,10-phenanthroline-5,6-dione) (4,4′-dicarboxy-2,2′-bipyridyl) ruthenium(II) photosensitizer. J Therm Anal Calorim 104:10171022 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 13. Gabal, MA 2004 Non-Isothermal studies for the decomposition course of CdC2O4–ZnC2O4 mixture in air. Thermochim Acta 412:5562 .

  • 14. Budrugeac, P, Segal, E 2005 On the use of Diefallah's composite integral method for the non-isothermal kinetic analysis of heterogeneous solid-gas reactions. J Therm Anal Calorim 82:677680 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 15. Wendlant Wesley, WM 1986 Thermal analysis 3 Wiley New York.

  • 16. Vyazovkina, S, Burnhamb, AK, Criadoc, JM, Pérez-Maquedac, LA, Popescud, C, Sbirrazzuolie, N 2011 ICTAC kinetics committee recommendations for performing kinetic computations on thermal analysis data. Thermochim Acta 520:119 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 17. The International Centre for Diffraction Data File No. 31–1425 and 32–1403.

  • 18. Favergeon, L, Pijolat, M, Helbert, C 2008 A mechanism of nucleation during thermal decomposition of solids. J Mater Sci 43:46754683 .

  • 19. Galwey, AK, Spinicci, R, Guarini, GT 1981 Nucleation and growth process occurring during the dehydration of certain alums: the generation, the development and the function of the reaction interface. Proc R Soc Lond A 378:477 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 20. Koga, N, Tanaka, H 2002 A physico-geometric approach to the kinetics of solid-state reactions as exemplified by thermal dehydration and decomposition of inorganic solids. Thermochim Acta 388:4161 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 21. Boonchom, B, Danvirutai, C 2009 Kinetics and thermodynamics of thermal decomposition of synthetic AlPO4·2H2O. J Therm Anal Calorim 98:771777 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 22. Boonchom, B 2008 Kinetics and thermodynamic properties of the thermal decomposition of manganese dihydrogenphosphate dihydrate. J Chem Eng Data. 53:15531558 .

    • Crossref
    • Search Google Scholar
    • Export Citation

Manuscript Submission: HERE

  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

For subscription options, please visit the website of Springer.

Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

Monthly Content Usage

Abstract Views Full Text Views PDF Downloads
Jun 2021 0 1 1
Jul 2021 2 0 0
Aug 2021 0 0 0
Sep 2021 3 0 0
Oct 2021 3 0 0
Nov 2021 4 1 1
Dec 2021 0 0 0