Templated Fabrication of Core鈥揝hell Magnetic Mesoporous Carbon Microspheres in 3-Dimensional Ordered Macroporous Silicas

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• 作者：Minghong Wang ; Xiqing Wang ; Qin Yue ; Yu Zhang ; Chun Wang ; Jin Chen ; Huaqiang Cai ; Hongliang Lu ; Ahmed A. Elzatahry ; Dongyuan Zhao ; Yonghui Deng
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：May 27, 2014
• 年：2014
• 卷：26
• 期：10
• 页码：3316-3321
• 全文大小：391K
• 年卷期：v.26,no.10(May 27, 2014)
• ISSN：1520-5002

文摘

A confined synthesis strategy is demonstrated for the fabrication of core鈥搒hell 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.