Facile Synthesis of Magnetic Hierarchical Core–Shell Structured Fe3O4@PDA‐Pd@MOF Nanocomposites: Highly Integrated Multifunctional Catalysts

• Published in: ChemCatChem Vol. 10; no. 6; pp. 1446 - 1454
• Main Authors: Ma, Rong, Yang, Pengbo, Ma, Yao, Bian, Fengling
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 21.03.2018
• Subjects: 4-nitrophenol reduction; Aromatic compounds; Catalysis; Catalysts; Catalytic activity; Chemical reactions; Core-shell structure; Halides; Iron oxides; magnetic core–shell nanocomposites; Metal-organic frameworks; Nanocomposites; Nanoparticles; Nitrophenol; Palladium; Shells; Structural hierarchy; Suzuki coupling; Synergistic effect; Thickness; X ray photoelectron spectroscopy
• ISSN: 1867-3880; 1867-3899
• DOI: 10.1002/cctc.201701693

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. A magnetic hierarchical core–shell structured Fe3O4@PDA‐Pd@[Cu3(btc)2] nanocomposite was successfully fabricated by a facile method. The magnetically reusable catalyst shows ultrahigh catalytic activity in the reduction of 4‐nitrophenol and Suzuki–Miyaura reactions with excellent reusability. The synergistic effect between Fe3O4@PDA‐Pd and [Cu3(btc)2] was observed in this catalytic system.