静电纺丝法制备Fe_2O_3/TiO_2复合纳米纤维及光催化性能研究

Electrospinning Preparation of Fe_2O_3/TiO_2 Composite Nanofibers and Their Photocatalytic Properties

以聚乙烯吡咯烷酮、钛酸正丁酯和氯化铁为前驱体,利用静电纺丝法制备了Fe2O3/Ti O2复合纳米纤维.采用SEM,XRD,FT-IR和UV-Vis DRS等测试手段对纤维的形貌和结构进行了表征.通过对罗丹明B染料的光催化降解实验,探讨了煅烧温度和Fe2O3的含量对光催化性能的影响.结果表明:Fe2O3/Ti O2复合纳米纤维中Fe3+进入到Ti O2的晶格,从而改变了Ti O2的光谱响应范围.煅烧温度为600℃,0.5%(质量分数)Fe2O3含量的Fe2O3/Ti O2复合纳米纤维,在可见光范围具有良好的光催化活性.

By combining with sol-gel method and electrospinning technology,polyvinyl pyrrolidone（PVP）/Ti（OiPr）4/FeCl3 composite nanofibers were prepared.After calcination of the above as-spun precursor nanofibers,Fe2O3/TiO2 composite nanofibers were successfully obtained.The morphology and structure of products were characterized by SEM,XRD,FT-IR and UV-Vis DRS.The photocatalytic efficiencies of Fe2O3/TiO2 composite nanofibers were assessed by monitoring the photodegradation of Rhodamine B.Furthermore,the influences of calcination temperature as well as Fe2O3 content in the Fe2O3/TiO2 composite nanofibers on their photocatalytic properties were investigated.The results showed that the absorption threshold of TiO2 could be shifted to visible light range due to the presence of Fe3＋ in the titania framework.The Fe2O3/TiO2 composite nanofibers calcined at 600 ℃,with the molar ratio of Fe2O3 to TiO2 of 0.5 %,displayed better photocatalytic activity under visible light irradiation.