Abstract In this paper, we have demonstrated a facile and environmentally friendly approach to prepare Fe3O4/Ag nanocomposites (Fe3O4/Ag NPs) by a two-step method. During the preparation process, neither any other reducing agents nor toxic organic solvents were employed. Firstly, Fe3O4 nanoparticles were prepared by co-precipitation and stabilized with the sodium tartrate. Secondly, Fe3O4/Ag composite nanoparticles were synthesized by a simple reflux method, which once more using sodium tartrate as a green reducing agent to reduce the AgNO3 to Ag NPs. The as-prepared NPs were characterized by UV–vis spectrometer, dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM). Both the sodium tartrate stabilized Fe3O4 nanoparticles (Fe3O4@ST NPs) and Fe3O4/Ag NPs showed well dispersed in water and had high superparamagnetism at room temperature, which can be quickly actuated by a small household magnet. More importantly, the Fe3O4/Ag NPs exhibited excellent catalytic properties both in efficiency and recyclability for the degradation of methyl orange (MO) in the presence of H2O2 and the composition was unchanged after 5 cycle times.

中文翻译：

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双功能酒石酸钠作为稳定剂和还原剂，用于合成具有催化活性的 Fe3O4/Ag 纳米复合材料

摘要 在本文中，我们展示了一种通过两步法制备 Fe3O4/Ag 纳米复合材料 (Fe3O4/Ag NPs) 的简便且环保的方法。在制备过程中，没有使用任何其他还原剂和有毒有机溶剂。首先，通过共沉淀制备 Fe3O4 纳米颗粒并用酒石酸钠稳定。其次，通过简单的回流法合成了 Fe3O4/Ag 复合纳米粒子，再次使用酒石酸钠作为绿色还原剂将 AgNO3 还原为 Ag NPs。所制备的纳米颗粒通过紫外可见光谱仪、动态光散射 (DLS)、透射电子显微镜 (TEM)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和振动样品磁强计 (VSM) 进行表征。 ）。酒石酸钠稳定的 Fe3O4 纳米粒子（Fe3O4@ST NPs）和 Fe3O4/Ag NPs 在水中均表现出良好的分散性，并且在室温下具有很高的超顺磁性，可以通过小型家用磁铁快速驱动。更重要的是，Fe3O4/Ag NPs 在 H2O2 存在下降解甲基橙 (MO) 的效率和可回收性均表现出优异的催化性能，并且在 5 次循环后成分没有变化。