Fabrication of Bifunctional Titania/Silica-Coated Magnetic Spheres and their Photocatalytic Activities
Fabrication of Bifunctional Titania/Silica-Coated Magnetic Spheres and their Photocatalytic Activities
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DOI：
10.1111/j.1551-2916.2007.01989.x
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发表时间：
2007-12
影响因子：
3.9
通讯作者：
Xuefeng Song;Lian Gao
中科院分区：
文献类型：
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作者：
Xuefeng Song;Lian Gao
通过在磁芯上包覆一层惰性二氧化硅(SiO_2)和光活性二氧化钛(TiO_2)，制备了一种磁性光催化剂。直接在包覆了二氧化硅的磁球上形成了完整的光活性二氧化钛壳层。后续的水热处理提高了二氧化钛的结晶度。二氧化钛/二氧化硅包覆磁性微球对水溶液中亚甲基蓝的降解表现出良好的光催化活性。光催化二氧化钛表面层由中间二氧化硅层与磁芯电绝缘，以保持二氧化钛壳层良好的光催化活性。外加磁场可以很容易地回收磁性光催化剂。
A magnetic photocatalyst is prepared by coating a magnetic core with a dual layer of inert silica (SiO2) and photoactive titania (TiO2). The complete photoactive TiO2 shell is directly formed on the SiO2-coated magnetic spheres. Subsequent hydrothermal treatment improves the degree of crystallinity of TiO2. TiO2/SiO2-coated magnetic spheres show good photocatalytic activities in the degradation of methylene blue in the aqueous solution. The photocatalytic TiO2 surface shell is electrically insulated by the intermediate SiO2 layer from the magnetic core to maintain good photocatalytic activity of the TiO2 shell. The magnetic photocatalyst can be easily recovered by applying external magnetic field.