Synthesis of polyaniline-modified Fe3O4/SiO2/TiO2 composite microspheres and their photocatalytic application
Synthesis of polyaniline-modified Fe3O4/SiO2/TiO2 composite microspheres and their photocatalytic application
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聚苯胺改性Fe3O4/SiO2/TiO2复合微球的合成及其光催化应用
DOI：
10.1016/j.matlet.2011.06.005
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发表时间：
2011-10-01
影响因子：
3
通讯作者：
Gao, Hongyi
中科院分区：
文献类型：
--
作者：
Huang, Xiubing;Wang, Ge;Gao, Hongyi
通过在Fe3O4微球上进行溶胶-凝胶反应，再通过苯胺的化学氧化聚合，成功地制备了聚苯胺改性的Fe3O4/SiO_2/TiO2复合微球。用透射电子显微镜、X射线衍射仪、热重分析、紫外-可见漫反射光谱和磁强计对所合成的多层结构复合材料进行了表征。通过在可见光下对亚甲基蓝的光降解来评价其光催化活性。考察了聚苯胺(PANI)用量对光催化活性的影响。光催化活性测试结果表明，PANI含量为2.4wt.%~4.1wt.%的Fe3O4/SiO_2/TiO2光催化活性高于Fe3O4/SiO_2/TiO2光催化活性。此外，PANI-Fe_3O_4/SiO_2/TiO2光催化剂可以很容易地用磁铁回收。(C)2011爱思唯尔B.V.保留所有权利。
Polyaniline-modified Fe3O4/SiO2/TiO2 composite microspheres have been successfully synthesized by sol-gel reactions on Fe3O4 microspheres followed by the chemical oxidative polymerization of aniline. The synthesized multilayer-structured composites were characterized by TEM, XRD, TGA, UV-vis diffuse reflectance spectra and magnetometer. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light. The effect of polyaniline (PANI) amounts on the photocatalytic activity was investigated. The photocatalytic activity results show that the Fe3O4/SiO2/TiO2 composites with about 2.4 wt.%-4.1 wt.% PANI could show higher photocatalytic efficiency than that of Fe3O4/SiO2/TiO2. Furthermore, the PANI-Fe3O4/SiO2/TiO2 photocatalyst could be easily recovered using a magnet. (C) 2011 Elsevier B.V. All rights reserved.