Ce掺杂Bi_2MoO_6/TiO_2纳米纤维异质结的制备及可见光催化性能  

Preparation and Visible-Light Photocatalytic Properties of Ce-doped Bi_2MoO_6/TiO_2 Nanofibers Heterojunction

作　　者：李跃军[1] 曹铁平[1] 梅泽民[1] 席啸天 王霞 孙大伟 LI Yue-Jun;CAO Tie-Ping;MEI Zhe-Min;XI Xiao-Tian;WANG Xia;SUN Da-Wei(Research Centre of Nano-Photocatalyst,Baicheng Normal University,Baicheng,Jilin 137000,China)

机构地区：[1]白城师范学院,纳米光催化材料研究中心,白城137000

出　　处：《无机化学学报》2018年第4期689-696,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21573003)和吉林省自然科学基金(No.20140101118JC)项目资助

摘　　要：以静电纺丝技术制备的TiO_2纳米纤维为基质,通过溶剂热法制备了异质结型稀土Ce掺杂Bi_2MoO_6/TiO_2复合纳米纤维。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、透射电镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)以及荧光光谱(PL)等分析测试手段对样品的物相、形貌和光学性能等进行表征。以罗丹明B为模拟有机污染物,研究了样品的可见光催化性能。结果表明:在稀土掺杂样品中,Ce离子进入Bi_2MoO_6晶格,部分取代Bi3+,导致晶胞膨胀,晶格畸变,形成缺陷;与TiO_2复合形成异质结,有利于光生电荷的产生、转移和有效分离,从而提高TiO_2纳米纤维的光催化活性。可见光照射180 min,罗丹明B的降解率达到95.1%。经5次循环光催化降解活性基本不变,样品具有良好的光催化稳定性。By employing electrospun TiO2 nanofiber as substrate,rare earth Ce doped Bi2MoO6/TiO2 composite nanofibers were prepared via solvothermal method.The composition,morphology and optical properties were characterized by XRD,SEM,XPS,TEM,UV-Vis DRS and PL analysis.The photocatalytic properties were tested by degradation of rhodamine B under visible light.The results show that Ce3+ion can be a substitute for Bi3+in the crystal lattice of Bi2MoO6,resulting in an expansion,distortion of lattice cell and hence defects.Photocatalytic test shows that the activity of TiO2 nanofibers under visible light can be enhanced.For example,the degradation percentage of RhB can be as high as 95.1%,which is believed to benefit from the effective charge generation,transfer and separation at the interface of Ce-doped Bi2MoO6/TiO2 heterojunction.Moreover,the Ce-doped Bi2MoO6/TiO2composite nanofibers are of good stability,whose activity is hardly decreased after cycling 5 times.

关 键 词：稀土Ce掺杂 Bi2MoO=/TiO2纳米复合纤维 异质结 可见光催化 静电纺丝 

分 类 号：O643[理学—物理化学]