Preparation of magnetically recoverable Fe₃O₄@SiO₂@meso-TiO₂ nanocomposites with enhanced photocatalytic ability

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• 作者：Qing Yuan ; Nan Li ; Wangchang Geng ; Yue Chi ; Xiaotian Li
• 关键词：A. Composites ; A. Magnetic materials ; B. Chemical synthesis ; C. X-ray diffraction ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：47
• 期：9
• 页码：2396-2402
• 全文大小：947 K

文摘

A simple and efficient method has been developed to fabricate core-shell structured Fe₃O₄@SiO₂@meso-TiO₂ nanocomposites with enhanced photocatalytic activity in this paper. The as-made core-shell structure is composed of a central magnetite core with a strong response to external fields, an interlayer of SiO₂, and an outer layer of TiO₂ nanocrystals with mesoporous structure. Fe₃O₄@SiO₂ was obtained through a sol-gel process. To avoid magnetic loss caused by magnetite core phase transition and particle reunion, we adopt a mild synthetic method to get anatase shell instead of traditional high-temperature calcination. The structure of resulting composites was characterized and their photocatalytic activities were also tested. Fe₃O₄@SiO₂@meso-TiO₂ composite exhibits higher photocatalytic activities than Fe₃O₄@SiO₂@solid-TiO₂ for the degradation of rhodamine B in aqueous suspension. The excellent photocatalytic activities are ascribed to the high surface area and pore volume created by mesoporous anatase shell.