Template-Free Synthesis and Mechanistic Study of Porous Three-Dimensional Hierarchical Uranium-Containing and Uranium Oxide Microspheres

Lin Wang, Ran Zhao, Cong zhi Wang, Li yong Yuan, Zhan jun Gu, Cheng liang Xiao, Shu ao Wang, Xin wei Wang, Yu liang Zhao, Zhi fang Chai, Wei qun Shi

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A novel type of uranium-containing microspheres with an urchin-like hierarchical nano/microstructure has been successfully synthesized by a facile template-free hydrothermal method with uranyl nitrate hexahydrate, urea, and glycerol as the uranium source, precipitating agent, and shape-controlling agent, respectively. The as-synthesized microspheres were usually a few micrometers in size and porous inside, and their shells were composed of nanoscale rod-shaped crystals. The growth mechanism of the hydrothermal reaction was studied, revealing that temperature, ratios of reactants, solution pH, and reaction time were all critical for the growth. The mechanism study also revealed that an intermediate compound of 3UO3{dot operator}NH3{dot operator}5H2O was first formed and then gradually converted into the final hydrothermal product. These uranium-containing microspheres were excellent precursors to synthesize porous uranium oxide microspheres. With a suitable calcination temperature, very uniform microspheres of uranium oxides (UO2+x, U3O8, and UO3) were successfully synthesized.

Original languageEnglish (US)
Pages (from-to)12655-12662
Number of pages8
JournalChemistry - A European Journal
Volume20
Issue number39
DOIs
StatePublished - Sep 22 2014

Keywords

  • Actinides
  • Oxides
  • Phase transitions
  • Porous structures
  • Uranium

ASJC Scopus subject areas

  • Chemistry(all)

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