磁性二氧化钛-磷钨酸复合催化剂的制备及光催化性能研究

采用层层自组装法成功制备了兼具磁性和光催化活性的双功能Fe_3O_4@SiO_2/(TiO_2/PW_(12))_(10)复合微球,利用扫描电镜、红外光谱和X-射线能谱仪对所得微球进行了结构和形貌的表征。以甲基橙为模型污染物,研究了紫外光下Fe_3O_4@SiO_2/(TiO_2/PW_(12))_(10)的光催化性质,系统考察了甲基橙溶液的初始浓度、溶液pH和无机氧化剂碘酸钾对复合膜催化效率的影响。动力学研究表明,在不同浓度甲基橙溶液中,染料的光催化降解遵循表观一级反应动力学。磁性Fe_3O_4纳米粒子的使用实现了反应后催化剂方便、快速和高效地分离回收。

Fabrication of Titanium Dioxide-Tungstophosphate Acid Magnetic Microspheres and Photocatalytic Performance

Photocatalytic microspheres (TiO2/PW12) 10 on magnetic Fe3O4@SiO2 core-shell microspheres were fabricated by electrostatic layer-by-layer (LbL) self-assembly method.The microspheres were characterized by scan electron microscopy (SEM),infrared spectroscopy (IR) and X-ray energy dispersive spectrometer(EDS).Photocatalytic activities of obtained hybrid magnetic microspheres were tested via the degradation of aqueous methyl orange solution under UV irradiation.The effect of initial dye concentration,pH of solution and inorganic oxidant such as KIO3 on MO degradation were checked in detail.Kinetics of MO photodegradation has been found to follow the first-order reaction at different initial concentration.The easy,fast and efficient separation of catalyst after catalytic reaction was achieved by the use of magnetic Fe304 substrate.