Templated fabrication of core-shell magnetic mesoporous carbon microspheres in 3-dimensional ordered macroporous silicas

  • Wang M
  • Wang X
  • Yue Q
 et al. 
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A confined synthesis strategy is demonstrated for the fabrication of core?shell magnetic mesoporous carbon microspheres by solvent evaporation induced self-assembly of ethanolic solutions of precursors (containing resol as carbon source, Pluronic F127 as a structure directing agent) in the cavity of presynthesized 3-dimensional ordered macroporous silica materials with each macropore filled with a magnetite particle. The obtained magnetic mesoporous carbon (Fe3O4@FDU-15) microspheres possess uniform diameter of ?460 nm, ultralarge mesopores of 13.8 nm, high surface area of ?403 m2/g, and strong magnetization (20.7 emu/g). Sub-4 nm gold nanoparticles are loaded in the porous shell of the magnetic microspheres, resulting in a novel Fe3O4@FDU-15/Au nanocatalyst with an excellent performance in catalyzing the epoxidation of styrene with high conversion (72%) and selectivity (85%) toward styrene oxide in 12 h and a good magnetic field-assisted recyclability.

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  • Minghong Wang

  • Xiqing Wang

  • Qin Yue

  • Yu Zhang

  • Chun Wang

  • Jin Chen

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