Preparation of Magnetic Photocatalyst TiO2Supported on NiFe2O4and Effect of Magnetic Carrier on Photocatalytic Activity
Preparation of Magnetic Photocatalyst TiO2Supported on NiFe2O4and Effect of Magnetic Carrier on Photocatalytic Activity
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DOI：
10.1002/cjoc.200890156
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发表时间：
2008-05
影响因子：
5.4
通讯作者：
Shihong Xu;Daolun Feng;Deng-xin Li;W. Shangguan
中科院分区：
文献类型：
--
作者：
Shihong Xu;Daolun Feng;Deng-xin Li;W. Shangguan
采用溶胶-凝胶法制备了具有典型铁磁滞回的磁性光催化剂TiO2/NiFe2O4 (TN)，该催化剂在外加磁场作用下易于从浆料型光反应器中分离，是一种很有前途的废水处理光催化剂。XRD分析表明，高度分散的NiFe2O4纳米颗粒在一定程度上阻止了金红石相的形成。透射电子显微镜（TEM）表征了光催化剂的结构，表明纳米NiFe2O4高度分散在TiO2纳米颗粒中。所制备的光催化剂对水中甲基橙的降解表现出较高的光催化活性。降解结果表明，纳米NiFe2O4对TN光催化剂起到了光生电子与空穴复合中心的作用，导致其光催化活性下降。此外，TN循环利用实验表明，其光催化活性具有良好的重复性。
A magnetic photocatalyst TiO2/NiFe2O4 (TN) with typical ferromagnetic hysteresis was prepared by a sol-gel method, which is easy to be separated from a slurry-type photoreactor under the application of an external magnetic field, being one of promising photocatalysts for wastewater treatment. The analysis of XRD indicated that the highly dispersed NiFe2O4 nanoparticles prevented the formation of rutile phase to some extent. A transmission electron microscope (TEM) was used to characterize the structure of the photocatalyst, indicating that the NiFe2O4 nanoparticles highly dispersed among TiO2 nanoparticles. The prepared photocatalyst showed high photocatalytic activity for the degradation of methyl orange in water. The degradation results revealed that the NiFe2O4 nanoparticles played the role of recombination centre of photogenerated electrons and holes for the TN photocatalyst, which gave rise to the decrease in photocatalytic activity. Moreover, the experiment on recycled use of TN demonstrated a good repeatability of the photocatalytic activity.