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首页> 外文期刊>RSC Advances >Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe3O4 nanoclusters for the catalytic reduction of 4-nitrophenol
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Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe3O4 nanoclusters for the catalytic reduction of 4-nitrophenol

机译：聚多巴胺作为修饰Fe 3 O 4 纳米簇上单分散金纳米颗粒的催化还原4-硝基苯酚的桥梁

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Herein, gold nanoparticles (Au NPs) were decorated on magnetic Fe3O4 nanoclusters@polydopamine nanocomposites (Fe3O4@PDA NCs) through a direct and green reduction method. The morphology was investigated via transmission electronic microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Results showed that Fe3O4 nanoclusters were successfully coated with a PDA shell layer of 25 nm thickness that could work as a reducing reagent to form Au NPs on the surface of Fe3O4@PDA NCs and prevent the aggregation of Au NPs as well. More interestingly, the concentration of the Au precursor had a great effect on both the size and the dispersion of Au NPs on the surface of Fe3O4@PDA NCs, which directly affected the catalytic activity of Fe3O4@PDA@Au. The catalytic performance of Fe3O4@PDA@Au was determined by reducing 4-nitrophenol to 4-aminophenol in the presence of excessive NaBH4, and the result showed that Fe3O4@PDA@Au prepared from a 130 μM Au precursor exhibited the best catalytic activity with the reaction rate constant of 39.2 s?1 g?1 and a conversion of >99% in ten minutes. After being recycled and reused ten times, the magnetic catalyst still had a conversion of >95%; this suggested that it might have practical applications in the reduction of nitroaromatic compounds.
机译：在这里，金纳米颗粒（Au NPs）在磁性Fe 3 O 4 nanoclusters @ polydopamine纳米复合材料（Fe通过直接绿色还原方法 3 O 4 @PDA NC）。通过透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对形态进行了研究。结果表明，Fe 3 O 4 纳米簇已成功被25 nm厚度的PDA壳层覆盖用作还原剂，在Fe 3 O 4 @PDA NCs的表面上形成金纳米颗粒并防止金纳米颗粒的聚集也是如此。更有趣的是，Au前体的浓度对Fe 3 O 表面上Au NPs的尺寸和分散性都有很大影响。 4 @PDA NCs，直接影响Fe 3 O 4 小> @ PDA @ Au。 Fe 3 O 4 @ PDA @ Au的催化性能通过将4-硝基苯酚还原为4- NaBH 4 存在下的氨基苯酚，结果表明Fe 3 O 4 @ PDA @ Au表现出最佳的催化活性，反应速率常数为39.2 s ？1 g ？1 ，并在十分钟内实现了> 99％的转化。循环使用十次后，磁性催化剂的转化率仍> 95％。这表明它可能在还原硝基芳香族化合物方面有实际应用。

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