Au/Fe3O4纳米复合材料的制备及其催化性能

Preparation and catalytic properties of Au/Fe3O4 nanocomposites

摘要:

通过将金纳米粒子铆接到 Fe3O4 载体表面，制得了Au/Fe3O4 纳米复合粒子。首先以对苯二酚为还原剂还原 HAuCl4 制得球形金纳米，然后采用溶剂热法制备Fe3O4 磁性纳米颗粒，并用巯基丙酸 (MPA) 对其修饰，最后通过 MPA 与金纳米之间的相互作用，将金纳米颗粒固定到 Fe3O4 表面。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X-射线衍射仪 ( XRD )、傅里叶红外光谱仪 (FT-IR)和振动样品磁强计 (VSM) 和紫外-可见分光光度计 (UV-vis)对所制备材料进行形貌、晶型、磁性和催化性能的表征。结果表明，金纳米颗粒成功包覆在Fe3O4 表面，所得到的Au/Fe3O4复合纳米材料具有单分散性和超顺磁性，并且对NaBH4 还原对硝基苯酚 (4-NP) 制备对氨基苯酚 (4-AP)的反应显示出优良的催化性能。

Abstract:

Au/Fe3O4 nanocomposites were prepared by anchoring gold nanoparticles onto Fe3O4 support surfaces. First, spherical gold nanoparticles was synthesised via a reducing method with hydroquinone as reductants. Then, Fe3O4 supports were synthesized by a solvothermal method and modified by mercaptopropionic acid (MPA). At last, gold nanoparticles were immobilized on the surface of Fe3O4 support using MPA as a linker,. The morphology, crystallinity, magnetism and catalytic activity of the Au/Fe3O4 nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, vibrating sample magnetometry (VSM) and UV–Vis spectrophotometer (UV-vis). The results indicate that the surface of the Au/Fe3O4 composite is coated with gold nanoparticles (NPs), the nanocomposites are monodisperse and supermagnetic, and show an excelently catalytic activity in the reduction of 4-nitrophenol to 4-aminophenol with sodium borohydride.