Fe_3O_4/TiO_2的制备及太阳光催化性能研究

Study on Synthesis and Photocatalytic Property of Fe_3O_4/TiO_2

采用水解法制备了Fe_3O_4/TiO_2光催化剂,以紫外光和太阳光为光源,以苯酚降解为模型反应,4-氨基吡啉显色法来测定溶液中残余苯酚的浓度,并通过IR、XRD和UV-vis等方法对催化剂进行表征。光催化降解苯酚的活性实验表明,当Fe_3O_4含量为20%,焙烧温度为400℃时,Fe_3O_4/TiO_2的催化剂具有较好的太阳光活性和磁回收性能。反应150min,苯酚的降解率达50%;催化表征说明铁离子进入了TiO_2晶格形成了Fe-O-Ti键,400℃焙烧的TiO_2和20%Fe_3O_4/TiO_2为中TiO_2为锐钛矿相,Fe_3O_4复合后,TiO_2粒径降低了近9 nm,同时增强了可见光吸收性能,促进了Fe_3O_4/TiO_2的苯酚降解活性。

Fe3 O4/TiO2 photocatalysts were prepared by TiCl4 hydrolysis method. The prepared samples were characterized by diffuse reflectance spectra （ UV - VIS） , X - ray diffraction （XRD） and infrared （IR） techniques. Phenol photocatalytic degradation results suggests that Fe3O4/TiO2 （mass ratio, where Fe3O4 is 20, TiO2 is 100, 400℃ ,2h） has better sunlight catalytic activity, which held the conversion rates of phenol is 50% at pH = 6.0 under sunlight irradiation for 150min, and has better magnetic recycling performance. The catalytic characterization showed that the iron ions in the TiO2 lattice formed the Fe- O - Ti bond, anatase phase existed in TiO2 and Fe3O4/TiO2 catalysts when calcined at 400℃ for 2 h, and decreased 9nm for TiO2 particle size after loading Fe3O4, while the absorption properties of the 20% Fe3O4/TiO2 were enhanced, also promoted the phenol degradation activity.