Preparation of magnetically recoverable Fe3O4@SiO2@meso-TiO2 nanocomposites with enhanced photocatalytic ability
Preparation of magnetically recoverable Fe3O4@SiO2@meso-TiO2 nanocomposites with enhanced photocatalytic ability
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DOI：
10.1016/j.materresbull.2012.05.031
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发表时间：
2012-09
影响因子：
5.4
通讯作者：
Qing Yuan;Nan Li;W. Geng;Y. Chi;Xiaotian Li
中科院分区：
文献类型：
--
作者：
Qing Yuan;Nan Li;W. Geng;Y. Chi;Xiaotian Li
本文开发了一种简单有效的方法来制备具有增强光催化活性的核壳结构Fe3O4@SiO2@meso-TiO2纳米复合材料。所制成的核壳结构由对外部场有强烈响应的中心磁铁矿核、SiO2 夹层和具有介孔结构的 TiO2 纳米晶体外层组成。 Fe3O4@SiO2是通过溶胶-凝胶过程获得的。为了避免磁铁矿核相变和颗粒团聚造成的磁损失，我们采用温和的合成方法来代替传统的高温煅烧来获得锐钛矿壳。对所得复合材料的结构进行了表征，并测试了其光催化活性。 Fe3O4@SiO2@meso-TiO2复合材料对水悬浮液中罗丹明B的降解表现出比Fe3O4@SiO2@solid-TiO2更高的光催化活性。优异的光催化活性归因于介孔锐钛矿壳产生的高表面积和孔体积。
A simple and efficient method has been developed to fabricate core–shell structured Fe3O4@SiO2@meso-TiO2nanocomposites 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 TiO2nanocrystals with mesoporous structure. Fe3O4@SiO2was 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-TiO2composite exhibits higher photocatalytic activities than Fe3O4@SiO2@solid-TiO2for 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.