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- Title
Template-Free Synthesis and Mechanistic Study of Porous Three-Dimensional Hierarchical Uranium-Containing and Uranium Oxide Microspheres.
- Authors
Wang, Lin; Zhao, Ran; Wang, Cong ‐ zhi; Yuan, Li ‐ yong; Gu, Zhan ‐ jun; Xiao, Cheng ‐ liang; Wang, Shu ‐ ao; Wang, Xin ‐ wei; Zhao, Yu ‐ liang; Chai, Zhi ‐ fang; Shi, Wei ‐ qun
- 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 3 UO3⋅NH3⋅5 H2O 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.
- Subjects
CHEMICAL templates; URANIUM oxides; MICROSPHERES; ACTINIDE elements; PHASE transitions; FOURIER transform infrared spectroscopy; SCANNING electron microscopy
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 39, p12655
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201403724