原位水热合成SrTiO_3/TiO_2复合纳米纤维及光催化性能  

In-situ Hydrothermal Synthesis and Enhanced Photocatalytic Properties of SrTiO_3/TiO_2 Composite Nanofibers

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：《高等学校化学学报》2011年第11期2490-2497,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50572014;50972027);教育部新世纪优秀人才支持计划(批准号:NCET-05-0322)资助

摘　　要：以利用静电纺丝技术制备的TiO2纳米纤维为模板和反应物,原位水热合成了具有异质结构的SrTiO3/TiO2复合纳米纤维.采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能量散射光谱(EDS)、高分辨透射电子显微镜(HRTEM)和X射线光电子能谱(XPS)等测试手段对样品的结构和形貌进行了表征.用罗丹明B(RB)模拟有机污染物进行了光催化降解实验.结果表明,SrTiO3纳米立方体均匀地生长在TiO2纳米纤维表面,得到了异质结构复合光催化剂,其与纯TiO2纳米纤维相比光催化活性明显提高,且易于分离、回收和再利用,循环使用5次,RB的降解率仍保持在97%以上.初步探讨了SrTiO3/TiO2异质结的生长机制和光催化活性提高机理.Heterostructured SrTiO3/TiO2 composite nanofibers were fabricated by in situ hydrothermal method using TiO/nanofibers as both template and reactant. The morphology and structure of SrTiO3/TiO2 composite nanofibers were characterized via X-ray diffraction （XRD）, field emission scanning electron microscopy （ FESEM）, energy-dispersive spectrometry（EDS）, high-resolution transmission electron microscopy （HRTEM） and X-ray photoelectron spectroscopy （XPS）. The as-fabricated heterostructured composite included SrTiO3 nanocubes assembled uniformly on the surface of TiO2 nanofibers. Compared with the pure TiO2 nanofibers, SrTiO3/TiO2 nanofibers exhibited enhanced photocatalytic activity in the decomposition of Rhodamine B （RB） under ultraviolet light. This material also showed good catalytic stability and the deeolorizing efficiency of RB solution remained above 97% after 5 system after reaction and reuse. Finally, the growth times recycle, and was easily separated, removed from the mechanism of SrTiO3/TiO2 heterojunction and the mechanism for the enhancement of photocatalytic activity of heterostructured nanofibers were discussed.

关 键 词：静电纺丝 原位水热合成 SrTiO3/TiO2 光催化降解 

分 类 号：O614.4[理学—无机化学]