利用化学共沉淀法将铁盐和亚铁盐溶液按一定比例混合制备磁性纳米Fe3O4,再用3-巯基丙基三甲氧基硅烷修饰磁性粒子,连接金、银纳米粒子制备了核壳结构的功能性微粒.通过X-射线粉末衍射(XRD)、透射电子显微镜(TEM)及紫外-可见光吸收光谱仪(UV - Vis)对粒子的结构与性质进行表征.结果表明:磁性Fe3O4纳米粒子属立方晶型,Fe3O4@Au和Fe3O4@Ag粒子包裹完全,形状趋近于球形,兼有磁性和金、银纳米粒子的特性,对硝基化合物具有良好的催化性能.%Magnetic nanoparticles of Fe3O4 were prepared by co - deposition. Fe3O4 and gold/silver nano-particles were conjoined with (3 - mercapto - propyl) trimethoxysilane, and then core - shell functional Fe3O4@ Au and Fe3O4@ Ag nanoparticles were prepared by multi - step reduction with sodiumcitrate. These particles were characterized by TEM, XRD, UV - Vis. The analysis results showed that the prepared Fe3O4 nanoparticles are cubic structure. Spherical Fe3O4@ Au and Fe3O4@ Ag nanoparticles have excellent catalytic activity for the reduction of nitrocompounds by borohydride.
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