Fe_2O_3-TiO_2磁性复合材料的制备及可见光催化性能  

Preparation of Magnetic Fe_2O_3-TiO_2 Nanocomposite and Its Photocatalytic Activity Under Visible Light Irradition

作　　者：李秀莹[1] 王靖宇[1] 王晓宇[1] 苏丹[1] 韩喜江[1] 杜耘辰[1] 

机构地区：[1]哈尔滨工业大学化学实验中心,哈尔滨150001

出　　处：《高等学校化学学报》2010年第4期662-666,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20776032)资助

摘　　要：以FeCl3和Ti(C4H9O)4为前驱体,通过复合溶胶法制备了Fe2O3-TiO2磁性复合光催化剂,并用XPS,XRD,SEM,EDS及BET进行了表征.对亚甲基蓝的降解实验证明,Fe2O3的引入将复合材料的光响应范围扩展至可见光区,且掺杂的Fe2O3摩尔分数为1.0%时,样品可见光催化性能最高.磁强计的测试结果显示,复合光催化剂具有一定的磁性,可在反应结束后利用磁场从体系分离,使催化剂得到回收再利用.The composite photocatalysts of Fe2O3-TiO2 were prepared using FeCl3 and Ti（C 4 H9 O） 4 as precursors by sol-gel method.The photocatalysts were characterized by means of X-ray photoelectron spectroscopy（XPS） ,X-ray diffraction（XRD） ,scanning electron microscopy（SEM） ,and energy-dispersive X-ray spectroscopy（EDS） ,and nitrogen adsorption-desorption isotherms using the Brunauer-Emmett-Teller（BET） method.The results show that the composite consists of pure anatase TiO2 and Fe2 O3 with a diameter of about 15 nm.The photocatalytic activity of the Fe2 O3-TiO2 composite was confirmed through the photodegradation of methyl blue dye under visible light irradiation（λ420 nm） .The experimental results show that the composite photocatalysts have highly enhanced the photocatalytic efficiency in visible region when compared with each of the two pure semiconductor.The removal rate could reach the highest value under the molar fraction of Fe at 1.0%.More importantly,the magnetic properties are measured using a vibrating sample magnetometer,and the results show that the Fe2 O3-TiO2 photocatalyst could be separated from the solution in magnetic field after reaction and then could be recycled.

关 键 词：Fe2O3-TiO2 复合催化剂 可见光 磁分离 

分 类 号：O614[理学—无机化学] O644.14[理学—化学]