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Facile Hydrogen‐Bond‐Assisted Polymerization and Immobilization Method to Synthesize Hierarchical Fe 3 O 4 @Poly(4‐vinylpyridine‐ co ‐divinylbenzene)@Au Nanostructures and Their Catalytic Applications
Author(s) -
Guo Wanchun,
Wang Qian,
Wang Ge,
Yang Mu,
Dong Wenjun,
Yu Jie
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201201186
Subject(s) - divinylbenzene , materials science , catalysis , polymerization , nanoparticle , chemical engineering , copolymer , adsorption , monomer , hydrogen bond , nanostructure , polymer chemistry , nanotechnology , chemistry , polymer , molecule , organic chemistry , styrene , composite material , engineering
Hierarchical Fe 3 O 4 @poly(4‐vinylpyridine‐ co ‐divinylbenzene)@Au (Fe 3 O 4 @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 Fe 3 O 4 @P(4‐VP–DVB) microspheres were first prepared with a simple polymerization method, in which 4‐VP was easily polymerized on the surface of Fe 3 O 4 nanoparticles by means of strong hydrogen‐bond interactions between COOH groups on poly(acrylic acid)‐modified Fe 3 O 4 nanoparticles and a 4‐VP monomer. HAuCl 4 was adsorbed on the chains of a P(4‐VP) shell and then reduced to Au nanoparticles by NaBH 4 , which were embedded into the P(4‐VP) shell of the composite microspheres to finally form the Fe 3 O 4 @P(4‐VP–DVB)@Au nanostructures. The obtained Fe 3 O 4 @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).