层状、花形和棒状钛酸铋纳米结构的可控合成及光催化性能(英文)  

Controllable Synthesis and Photocatalytic Activity of Layered,Flowerlike,and Rodlike Bismuth Titanate Nanostructures

作　　者：林雪[1] 于丽丽[1] 闫丽娜[1] 闫永胜[2] 关庆丰[3] 赵晗[1] 

机构地区：[1]吉林师范大学化学学院,环境友好材料制备与应用教育部重点实验室,四平136000 [2]江苏大学化学化工学院,镇江212013 [3]江苏大学材料科学与工程学院,镇江212013

出　　处：《无机化学学报》2013年第11期2415-2421,共7页Chinese Journal of Inorganic Chemistry

基　　金：环境友好材料制备与应用教育部重点实验室项目;吉林省科技发展计划项目(20130522071JH)资助项目

摘　　要：通过可控水热法,制备出层状、花形和棒状钛酸铋(Bi4Ti3O12,BIT)纳米结构。通过X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)观测其结构和形貌特征。XRD图显示,所制备的样品为层状钙钛矿结构。FESEM结果表明,通过控制水热过程的反应参数可以得到不同形貌的纳米粉体。紫外-可见漫反射光谱(UV-Vis DRS)表明BIT样品的带隙能约为2.63～2.95 eV。利用可见光(λ>420 nm)照射下的甲基橙降解实验评价了BIT样品的光催化性能。结果表明,BIT的光催化活性比掺氮TiO2(N-TiO2)高得多。所制备的层状BIT纳米结构光催化效率最高,经可见光照射360 min,甲基橙溶液的降解率可达95.0%。同时还研究了结构和形貌对不同条件下制备的BIT样品光催化活性的影响。Layered, flowerlike, and rodlike bismuth titanate （Bi4Ti3O12, BIT） nanostructures were synthesized via the controllable hydrothermal method. The phase structures and morphologies were measured by X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM）. XRD patterns demonstrate that the as-prepared samples are of layered-perovskite structure. FESEM shows that BIT crystals can be fabricated in different morphologies by simply manipulating the reaction parameters of hydrothermal process. The UV-Vis diffuse reflectance spectra （UV-Vis DRS） reveal that the hand gaps of BIT photocatalysts are 2.63 ~2.95 eV. The as- prepared BIT photocatalysts exhibit higher photocatalytic activities in the degradation of methyl orange （MO） under visible light irradiation （λ 〉420 nm） compared with traditional N-doped TiO2 （N-TiO2）. Layered BIT nanostruetures show the highest photocatalytic activity. Up to 95.0% MO is decolorized after visible light irradiation for 360 min. In addition, the reason for the difference in the photocatalytic activities obtained at different conditions was studied based on the structures and morphologies.

关 键 词：钛酸铋 层状 花形 棒状 可控合成 光催化降解 

分 类 号：O643[理学—物理化学]