Synthesis, characterization and catalytic performance of core-shell structure magnetic Fe3O4/P(GMA-EGDMA)-NH2/HPG-COOH-Pd catalyst

A strategy has been developed for the synthesis, characterization and catalysis of magnetic Fe3O4/P(GMA-EGDMA)-NH2/HPG-COOH-Pd core-shell structure supported catalyst. The P(GMA-EGDMA) polymer layer was coated on the surface of hollow magnetic Fe3O4 microspheres through the effect of KH570. The core-shell magnetic Fe3O4/P(GMA-EGDMA) modified by -NH2 could be grafted with HPG. Then, the hyperbranched glycidyl (HPG) with terminal -OH were modified by -COOH and adsorbed Pd nanoparticles. The hyperbranched polymer layer not only protected the Fe3O4 magnetic core from acid-base substrate corrosion, but also provided a number of functional groups as binding sites for Pd nanoparticles. The prepared catalyst was characterized by UV-vis, TEM, SEM, FTIR, TGA, ICP-OES, BET, XRD, DLS and VSM. The catalytic tests showed that the magnetic Fe3O4/P(GMA-EGDMA)-NH2/HPG-COOH-Pd catalyst had excellent catalytic performance and retained 86% catalytic efficiency after 8 consecutive cycles.