title: Facile hydrogen-bond-assisted polymerization and immobilization method to synthesize hierarchical Fe3O4@poly(4-vinylpyridine-co-divinylbenzene)@Au nanostructures and their catalytic applications.
abstract: Hierarchical Fe3O4@poly(4-vinylpyridine-co-divinylbenzene)@Au (Fe3O4@P(4-VP-DVB)@Au) nanostructures were fabricated successfully by means of a facile two-step synthesis process. In this study, well-defined core-shell Fe3O4@P(4-VP-DVB) microspheres were first prepared with a simple polymerization method, in which 4-VP was easily polymerized on the surface of Fe3O4 nanoparticles by means of strong hydrogen-bond interactions between -COOH groups on poly(acrylic acid)-modified Fe3O4 nanoparticles and a 4-VP monomer. HAuCl4 was adsorbed on the chains of a P(4-VP) shell and then reduced to Au nanoparticles by NaBH4, which were embedded into the P(4-VP) shell of the composite microspheres to finally form the Fe3O4@P(4-VP-DVB)@Au nanostructures. The obtained Fe3O4@P(4-VP-DVB)@Au catalysts with different Au loadings were applied in the reduction of 4-nitrophenol (4-NP) and exhibited excellent catalytic activity (up to 3025 h(-1) of turnover frequency), facile magnetic separation (up to 31.9 emu g(-1) of specific saturation magnetization), and good durability (over 98 % of conversion of 4-NP after ten runs of recyclable catalysis and almost negligible leaching of Au).
authors.affiliation: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Wanchun
authors.initials: W
authors.lastname: Guo
authors.forename: Qian
authors.initials: Q
authors.lastname: Wang
authors.forename: Ge
authors.initials: G
authors.lastname: Wang
authors.forename: Mu
authors.initials: M
authors.lastname: Yang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Dong
authors.forename: Jie
authors.initials: J
authors.lastname: Yu
mesh_terms: D002384:Catalysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006860:Hydrogen Bonding; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D013499:Surface Properties; D014753:Vinyl Compounds / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D011725:Pyridines; D014753:Vinyl Compounds; C509367:poly(4-vinylpyridine-co-divinylbenzene); D006046:Gold; D052203:Ferrosoferric Oxide