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Facile Synthesis of Magnetic Hierarchical Core–Shell Structured Fe3O4@PDA‐Pd@MOF Nanocomposites: Highly Integrated Multifunctional Catalysts
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-16 , DOI: 10.1002/cctc.201701693
Rong Ma 1 , Pengbo Yang 1 , Yao Ma 1 , Fengling Bian 1
Affiliation  

A magnetic hierarchical core–shell structured Fe3O4@PDA‐Pd@[Cu3(btc)2] nanocomposite has been fabricated via a facile layer‐by‐layer assembly method. It contains a core of polydopamine (PDA)‐modified magnetic Fe3O4 nanoparticles (NPs), a transition layer of Pd NPs, and a porous outer shell of copper‐based metal–organic framework (MOF) with controllable thickness. This novel nanocomposite was characterized by TEM, FTIR, XRD, XPS, N2 adsorption–desorption isotherms, and VSM. The prepared Fe3O4@PDA‐Pd@[Cu3(btc)2] (n=5) nanocomposite shows ultrahigh catalytic activity for the 4‐nitrophenol reduction and Suzuki–Miyaura coupling reactions of aryl halides (Br, Cl) with arylboronic acids. Moreover, the nanocomposite also can be easily separated by an external magnet and reused at least 8 runs with excellent yields for both the reactions. The catalyst has outstanding catalytic performance, mainly because the integration of [Cu3(btc)2] with Fe3O4@PDA‐Pd that combines the advantages of each component could exhibit a synergistic effect in the catalytic system.

中文翻译:

磁性分层核-壳结构Fe3O4 @ PDA-Pd @ MOF纳米复合材料的轻松合成:高度集成的多功能催化剂

磁性层状壳结构的Fe 3 O 4 @ PDA‐Pd @ [Cu 3(btc)2 ]纳米复合材料是通过一种简便的逐层组装方法制备的。它包含聚多巴胺(PDA)修饰的磁性Fe 3 O 4纳米颗粒(NPs)的芯,Pd NPs的过渡层以及具有可控制厚度的铜基金属有机框架(MOF)的多孔外壳。这种新型的纳米复合材料的特征在于TEM,FTIR,XRD,XPS,N 2吸附-解吸等温线和VSM。制备的Fe 3 O 4 @ PDA‐Pd @ [Cu 3(btc)2 ](n= 5)纳米复合材料对芳基卤化物(Br,Cl)与芳基硼酸的4-硝基苯酚还原反应和Suzuki-Miyaura偶联反应具有超高催化活性。而且,该纳米复合材料还可以容易地被外部磁体分离,并且对于两个反应而言都可以以优异的产率重复使用至少8次。该催化剂具有出色的催化性能,主要是因为[Cu 3(btc)2 ]与Fe 3 O 4 @ PDA-Pd的结合(结合了每种组分的优势)可以在催化体系中发挥协同作用。
更新日期:2018-02-16
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