磁性纳米TiO_2/SiO_2/Fe_3O_4光催化剂的制备及表征

Preparation and Characterization of Nanometer-sized Magnetic Photocatalyst

以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样品为双层包覆型结构,SiO2为中间层,最外层是锐钛矿型的TiO2。该复合光催化剂对甲基橙溶液有较高的光催化活性,并具有可利用其磁性回收重用的特点,应用前景广泛。

By using nanometer-sized Fe3O4 as support, TiO2/SiO2/Fe3O4 coated particles were prepared by a sol-gel method. Its structure and morphology were characterized by XRD, TEM, and element analysis methods. The photocatalytic reactivity of TiO2/SiO2/Fe3O4 was studied with methyl orange solution. The results indicate that the TiO2/SiO2/Fe3O4 two-double coated particles are composed of SiO2 mesosphere and anatase TiO2 crust. The new photocatalyst has not only excellent photocatalytic activity but also good magnetic property that can make the callback easy.