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首页> 外文期刊>Chemistry: A European journal >Template-Free Synthesis and Mechanistic Study of Porous Three-Dimensional Hierarchical Uranium-Containing and Uranium Oxide Microspheres
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Template-Free Synthesis and Mechanistic Study of Porous Three-Dimensional Hierarchical Uranium-Containing and Uranium Oxide Microspheres

机译：多孔三维三维含铀氧化铀微球的无模板合成及机理研究

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摘要

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 3UO_3·NH_3·5H_2O 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 (UO_(2+x), U_3O_8, and UO_3) were successfully synthesized.
机译：采用六水合铀酰铀，尿素和甘油作为铀源，沉淀剂和形状控制剂，采用简便的无模板水热法成功合成了具有顽固型分级纳米/微结构的新型含铀微球。代理。合成后的微球通常大小为几微米，内部多孔，其壳由纳米级的棒状晶体组成。研究了水热反应的生长机理，发现温度，反应物比例，溶液pH和反应时间对生长至关重要。机理研究还表明，首先形成了3UO_3·NH_3·5H_2O中间体化合物，然后逐渐转化为最终的水热产物。这些含铀的微球是合成多孔氧化铀微球的优良前体。在合适的煅烧温度下，成功合成了非常均匀的铀氧化物微球（UO_（2 + x），U_3O_8和UO_3）。

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