Bi_2Ti_2O_7/TiO_2复合纤维:原位水热合成及光催化性能  

Bi_2Ti_2O_7/TiO_2 Composite Fibers:In-situ HydrothermalSynthesis and Enhanced Photocatalytic Properties

作　　者：李跃军[1,2] 曹铁平[1,2] 王长华[1] 邵长路[1] 

机构地区：[1]东北师范大学先进光电子功能材料研究中心,长春130024 [2]白城师范学院化学系,白城137000

出　　处：《无机化学学报》2011年第10期1975-1980,共6页Chinese Journal of Inorganic Chemistry

基　　金：教育部新世纪优秀人才支持计划(No.NCET-05-0322);国家自然科学基金(No.50972027)资助项目

摘　　要：采用静电纺丝技术制备的TiO2纤维作为模板和反应物,通过原位水热合成了具有异质结构的Bi2Ti2O7/TiO2复合纤维。利用X射线衍射(XRD)、扫描电镜(SEM)、能量散射光谱(EDS)、高分辨透射电镜(HRTEM)和紫外可见吸收光谱(UV-Vis)等分析测试手段对样品的结构和形貌进行表征。以罗丹明B为模拟有机污染物进行光催化降解实验。结果表明:花状Bi2Ti2O7纳米结构均匀地生长在TiO2纤维上,制备了Bi2Ti2O7与TiO2相复合的光催化材料,其光谱响应范围拓宽至可见光区,与纯TiO2纤维相比可见光催化活性显著提高,且易于分离、回收和循环使用。初步探讨了Bi2Ti2O7/TiO2异质结的生长机制和光催化活性提高机理。Heterostructured Bi2Ti2O7/TiO2 composite fibers were fabricated by in situ hydrothermal technique employing TiO2 fibers as both template and reactant.The morphology and structure of Bi2Ti2O7/TiO2 composite fibers were characterized by X-ray diffraction（XRD）,field emission scanning electron microscope（FESEM）,energy-dispersive spectrometry（EDS）,high-resolution transmission electron microscopy（HRTEM） and UV-Vis spectrocopy.The as-fabricated heterostructure composites are composed of flower-like Bi2Ti2O7 assembled uniformly on the surface of TiO2 fibers.The UV-Vis analysis indicates that the absorption spectrum of the sample is extended to the visible light region.Compared with the pure TiO2 fibers,Bi2Ti2O7/TiO2 composite fibers exhibite enhanced photocatalytic activity in the decomposition of Rhodamine B（RB） under visible light.This material also shows good catalytic stability and is easy to be separated,removed from the system after reaction and cycles.Finally,the growth mechanism of Bi2Ti2O7/TiO2 heterojunction and the mechanism for the enhancement of photocatalytic activity of heterostructured composite fibers are discussed.

关 键 词：静电纺丝 水热合成 Bi2Ti2O7/TiO2复合纤维 光催化 

分 类 号：O643[理学—物理化学]