Preparation and properties of a nano TiO2/Fe3O4 composite superparamagnetic photocatalyst
Preparation and properties of a nano TiO2/Fe3O4 composite superparamagnetic photocatalyst
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DOI：
10.1007/s12598-009-0082-7
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发表时间：
2009-09
期刊：
影响因子：
8.8
通讯作者：
Yuxiang Li;Mei Zhang;Min Guo;Xidong Wang
中科院分区：
文献类型：
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作者：
Yuxiang Li;Mei Zhang;Min Guo;Xidong Wang
采用溶胶-凝胶法制备了不同TiO 2/Fe 3 O 4摩尔比的纳米TiO 2/Fe 3 O 4复合粒子。采用X射线衍射、透射电子显微镜和振动样品磁强计对TiO 2/Fe 3 O 4颗粒进行了表征。在紫外光（254 nm）照射下，以甲基蓝溶液为降解对象，考察了纳米粒子的光催化活性。结果表明，随着TiO 2含量的增加，复合粒子的光催化活性增强，磁性降低。当TiO 2与Fe 3 O 4的摩尔比为8左右时，TiO 2/Fe 3 O 4粒子的光催化活性和磁性都比较高，重复使用后其光催化活性保持良好。
Nano TiO2/Fe3O4 composite particles with different molar ratios of TiO2 to Fe3O4 were prepared via sol-gel method. X-ray diffraction, transmission electron microscopy, and vibration sample magnetometry were used to characterize the TiO2/Fe3O4 particles. The photocatalytic activity of the particles was tested by degrading methyl blue solution under UV illumination (254 nm). The results indicate that with the content of TiO2 increasing, the photocatalytic activity of the composite particles enhances, while the magnetism of the particles decreases. When the molar ratio of TiO2 to Fe3O4 is about 8, both the photocatalytic activity and magnetism of the TiO2/Fe3O4 particles are relatively high, and their photocatalytic activity remains well after repeated use.