State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
Nanoscale. 2013 Apr 7;5(7):3078-82. doi: 10.1039/c3nr00041a.
A facile method is proposed for the synthesis of three-dimensional (3D) flower-like Co3-xFexO4 ferrite (CF) hollow spheres, using SiO2@FeOOH as precursor. The CF hollow spheres are efficient for the catalytic degradation of methylene blue (MB) in the presence of H2O2 at 80 °C. The obtained CF hollow spheres were characterized using transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, X-ray photo-electron spectroscopy, and N2 adsorption-desorption isotherm measurements. The formation of 3D hierarchical flower-like superstructure was influenced by the relative amount of urea used. As the mole ratio of CoCl2 and urea decreased, the structure of the products was tailored from yolk-like spheres to hollow spheres with different sized void interiors. Moreover, N2 adsorption-desorption isotherm analysis showed that the CF hollow spheres have a large specific surface area (163 m(2) g(-1)) which provided more activity sites. The CF hollow spheres can catalyze the oxidation of MB efficiently. These results indicate that the designed CF hollow spheres exhibit promising capability for the degradation of dyes.
提出了一种简便的方法来合成三维（3D）花状 Co3-xFexO4 铁氧体（CF）空心球，使用 SiO2@FeOOH 作为前体。CF 空心球在 80°C 下，在 H2O2 的存在下，对亚甲基蓝（MB）的催化降解非常有效。通过透射电子显微镜、场发射扫描电子显微镜、X 射线衍射、X 射线光电子能谱和 N2 吸附-脱附等温线测量对 CF 空心球进行了表征。3D 分级花状超结构的形成受所使用的尿素的相对量的影响。随着 CoCl2 和尿素的摩尔比的降低，产物的结构从蛋黄状球体被调整为具有不同大小的中空内部的空心球体。此外，N2 吸附-脱附等温线分析表明，CF 空心球具有较大的比表面积（163 m2 g-1），提供了更多的活性位。CF 空心球可以有效地催化 MB 的氧化。这些结果表明，所设计的 CF 空心球在染料降解方面表现出有前途的性能。
