Firstly, the highly dispersible magnetic Fe3O4nanoparticles was synthesized by hydrothermal method, and then Fe3O4@SiO2nanoparticles with core-shell structure was prepared under the St?ber condition. Fe3O4@SiO2@Ag magnetic nanoparticles was produced, which silver nanoparticles were successfully deposited on the outer shell using n-butylamine as the mild reductant of AgNO3in ethanol. The as-synthesized nanoparticles was characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectra (FT-IR), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and was exploited as a solid phase catalyst for the reduction of p-nitrophenol in the presence of NaBH4by UV–vis spectrophotometry. As a result, the as-obtained nanoparticles showed high performance in catalytic reduction of p-nitrophenol to p-aminophenol in the presence of an excess amount of NaBH4, convenient magnetic separability, as well as remained activity after recycled more than 6 times.%首先以水热法合成了高度分散性的磁性纳米粒子Fe3O4,然后在St2523rnber条件下以正硅酸乙酯为硅源,制备了具有核-壳结构的Fe3O4@SiO2.以Fe3O4@SiO2作为磁性载体,利用乙二胺的温和还原性,在AgNO3的乙醇溶液中,成功地将Ag纳米粒子沉积在Fe3O4@SiO2表面,得到了Fe3O4@SiO2@Ag磁性纳米粒子.分别用X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、电子扫描电镜(SEM)和电子透射电镜(TEM)对产品进行表征,并将磁性纳米粒子作为固体催化剂,用于催化硼氢化钠还原4-硝基酚的反应中.结果表明,该催化剂效果良好,方便从混合物中分离并重复使用,可重复利用6次以上.
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