Thermal Stability and Decomposition Kinetics of AgO Submicron Particles Prepared by Potassium Persulfate Oxidation

Authors

  • Hui FENG Shaanxi Institute of Zoology
  • Wenning SHEN Xi‘an University of Technology
  • Lajun FENG Xi‘an University of Technology
  • Ali LEI Xi‘an University of Technology
  • Yanfeng GE Xi‘an University of Technology

DOI:

https://doi.org/10.5755/j01.ms.24.1.17052

Keywords:

AgO, TGA, thermal properties, thermodynamic properties

Abstract

In this study, AgO submicron particles for antimicrobial application were prepared by potassium persulfate oxidation. The characterization of AgO particles was performed by XRD, XPS, SEM, TEM and TGA analysis. Its decomposition kinetics was studied by Doyle mechanism equation, Coats-Redfern equation and Ozawa approximate integration. The results showed that the as-prepared powders were composed of monoclinic AgO and small amounts of carbonate. The average width of AgO particles was about 200 nm with a rod-like morphology. AgO submicron particles could be decomposed to be Ag2O at 123 °C. When the temperature was increased to 405 °C, Ag2O was further transformed to be Ag. The decomposition reaction of AgO was controlled by Avrami-Erofeev random nucleation and subsequently growth mechanism (A1) with the apparent activation energy of 88.34 kJ/mol and the reaction frequency factor of 4.88 × 109 s-1.

DOI: http://dx.doi.org/10.5755/j01.ms.24.1.17052

Downloads

Published

2018-02-18

Issue

Vol. 24 No. 1 (2018)

Section

POLYMERS AND COMPOSITES, WOOD

License

 

The copyrights for articles in this journal are retained by the author(s), with first publication rights granted to the journal. By virtue of their appearance in this open-access journal, articles are free to use with proper attribution in educational and other non-commercial settings.