TiO_2/LaFeO_3微纳米纤维的可控制备及光催化性能  

Controllable Synthesis and Photocatalytic Activity of TiO_2 /LaFeO_3 Micro-nanofibers

作　　者：刘阳[1] 季宏伟[1] 周德凤[1] 朱晓飞[1] 李朝辉[1] 

机构地区：[1]长春工业大学化学与生命科学学院,长春130012

出　　处：《高等学校化学学报》2014年第1期19-25,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20871023);吉林省科技发展计划项目(批准号:20101549;20130102001JC);吉林省教育厅项目(批准号:2013130;2013146)资助~~

摘　　要：利用静电纺丝技术及水热合成法制备了TiO2/LaFeO3异质结构.采用场发射扫描电子显微镜(FESEM),X射线衍射(XRD),傅里叶变换红外(FTIR)光谱和紫外-可见漫反射光谱(UV-Vis)等手段对TiO2/LaFeO3微纳米纤维的结构和表面形态进行表征.通过亚甲基蓝(MB)光降解反应研究了其光催化性能.结果表明,不完全碳化TiO2纤维表面的缺陷位点是LaFeO3纳米粒子的有利生长点.TiO2/LaFeO3异质结材料的带隙明显窄于TiO2,光催化活性得到提高;经140 min紫外光照射后,TiO2/LaFeO3异质结催化剂对MB的降解率为65.34%,分析和探讨了其光催化机理.TiO2/LaFeO3 heterostructures were fabricated by electrospinning technique and hydrothermal syn- thesis method. The physieochemical properties of the catalysts were characterized by scanning electron micros- copy （ FE-SEM）, X-ray diffraction （ XRD）, Fourier transform infrared spectroscopy （FTIR） and ultraviolet- visible diffuse reflectance spectra （UV-Vis）. The photocatalytic activity of TiO2/LaFeO3 micro-nanofibers to- ward the decomposition of methylene blue（MB） was investigated. The results indicate that defect sites of in- completely carbonized TiO2 fibers are favorable for the growth of LaFeO3 nanoparticles. The band gap of TiO2/ LaFeO3 heterostructures is lower than TiO2 improving the photocatalytic activity. After 140 min TiO2/LaFeO3 heterostructures exhibited 65.34% for MB under UV light, and the photocatalytic mechanism of TiOJLaFeO3 heterostructures were analyzed and discussed.

关 键 词：TIO2 LAFEO3 异质结构 静电纺丝法 水热合成法 光催化性能 

分 类 号：O614.33[理学—无机化学]