| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation and Catalytic Performance of Ag/Pt Nanoparticles Catalyst Supported on Fe3O4@P(St-co-OBEG) Core-Shell Structured Microspheres |
| ZHU Jihong, ZENG Birong, LUO Wei’ang, YUAN Conghui, CHEN Lingnan, MAO Jie, DAI Lizong
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| Fujian Key Laboratory of Fire Retardant Materials, College of Materials, Xiamen University, Xiamen 361005 |
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Abstract In this work, magnetic composite microspheres Fe3O4@P(St-co-OBEG) were prepared via a surfactant-free emulsion polymerization and were used as carriers to support Ag and Pt to obtain magnetic composite nanocatalysts. It is known that magnetic composite catalysts can not only maintain the catalytic activity of noble metal nanoparticles, but realize magnetic separation. Here, the one-step surfactant-free emulsion polymerization was achieved by using styrene (St) as hydrophobic monomers, octadecyl-butenedioate-poly(ethylene glycol) (OBEG) as surfactant and γ-Fe3O4 as magnetic particles. Besides playing a role of surfactant to stable the solution, the amphiphilic oligomer OBEG also participated in the reaction during the polymerization. In details, the Fe3O4@P(St-co-OBEG) magnetic composite microspheres were prepared by stirring the reaction mixture at 65 ℃ for 24 h under N2 atmosphere. TEM presented a clear core-shell structure of Fe3O4@P(St-co-OBEG) microspheres. The diameter of the core were about 100—120 nm, while the thickness of the shell was in the range of 30—50 nm. Moreover, particle size analysis based on dynamic light scattering (DLS) confirmed an average particle size of about 228 nm. Subsequently, Ag/Fe3O4@P(St-co-OBEG) and Pt/Fe3O4@P(St-co-OBEG) were prepared by simply reducing AgNO3 or H2PtCl6 aqueous solution with dripping NaBH4 under room tempe-rature, and the successful deposition of Ag or Pt nanoparticles on the surfaces of Fe3O4@P(St-co-OBEG) microspheres was observed. Through catalysis tests, both Ag/Fe3O4@P(St-co-OBEG) and Pt/Fe3O4@P(St-co-OBEG) can be regarded as efficient catalysts for the reduction reactions of hydrophobic nitrobenzene and hydrophilic 4-nitrophenol, in which Pt/Fe3O4@P(St-co-OBEG) performed better in catalytic activity compared with Ag/Fe3O4@P(St-co-OBEG). This might be attributed to the more uniform distribution of Pt nanoparticles than Ag nanoparticles on the surfaces of Fe3O4@P(St-co-OBEG) microspheres according to TEM observation.
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Published: 11 March 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51573150,51673161),the Fujian Major R&D Platform Project (2014H2006). |
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2019, Vol. 33 
