Superparamagnetic High-Magnetization Microspheres with an Fe3O4@SiO2 Core and Perpendicularly Aligned Mesoporous SiO2 Shell for Removal of Microcystins

J. Am. Chem. Soc., 130 (1), 28 -29, 2008. 10.1021/ja0777584 S0002-7863(07)07758-X
Web Release Date: December 13, 2007

Superparamagnetic High-Magnetization Microspheres with an Fe₃O₄@SiO₂ Core and Perpendicularly Aligned Mesoporous SiO₂ Shell for Removal of Microcystins

Yonghui Deng, Dawei Qi, Chunhui Deng,* Xiangmin Zhang, and Dongyuan Zhao*

Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China

chdeng@fudan.edu.cn; dyzhao@fudan.edu.cn

Received October 9, 2007

Abstract:

Superparamagnetic microspheres with an Fe₃O₄@SiO₂ core and a perpendicularly aligned mesoporous SiO₂ shell were synthesized through a surfactant-templating sol-gel approach. The microspheres possess high magnetization (53.3 emu/g), high surface area (365 m²/g), large pore volume (0.29 cm³/g), and uniform mesopore (2.3 nm). By using the unique core-shell microspheres with accessible large pores and excellent magnetic property, a fast removal of microcystins with high efficiency (>95%) can be achieved.

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