Fabrication and Characterization of Monodisperse Magnetic Porous Nickel Microspheres as Novel Catalysts.
Fabrication and Characterization of Monodisperse Magnetic Porous Nickel Microspheres as Novel Catalysts.
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新型催化剂单分散磁性多孔镍微球的制备和表征
DOI：
10.1186/s11671-015-1088-8
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发表时间：
2015-12
影响因子：
--
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Teng C;He J;Zhu L;Ren L;Chen J;Hong M;Wang Y
报道了一种简单有效的硬模板法制备均匀性好、磁性强的多孔镍微球。该策略包括用镍前体浸渍多孔聚合物微球，煅烧以除去模板，然后热还原。采用扫描电子显微镜、X射线粉末衍射、N2吸附-脱附等温线、热重分析和磁滞回线等方法对Ni微球的形貌、结构和性能进行了表征。所得多孔镍微球粒径为0.91 μm，晶粒尺寸为52 nm，呈单分散性。它们的饱和磁化强度远高于Ni纳米颗粒。这种独特的多孔纳米结构镍微球具有催化活性和优异的可回收性，如在催化还原4-硝基苯酚为4-氨基苯酚中所示。微球镍催化剂可以很容易地通过外磁场或简单的过滤分离。
A facile and efficient hard-templating strategy is reported for the preparation of porous nickel microspheres with excellent uniformity and strong magnetism. The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characterized by scanning electron microscopy, X-ray powder diffraction, N2adsorption-desorption isotherms, thermogravimetric analysis, and magnetic hysteresis measurement. The obtained porous nickel microspheres were monodispersed with a particle size of 0.91 μm and crystallite size of 52 nm. Their saturation magnetization was much higher than that of Ni nanoparticles. The unique porous nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol. The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.