WO3/TiO2 复合纤维的制备及储能光催化性能

以钛酸正丁酯为前驱体, 采用静电纺丝技术制得了纯锐钛矿TiO2纤维, 并以其为基质, 通过水热法制备了具有异质结构的WO3/TiO2复合纤维. 利用X射线衍射仪(XRD)、 扫描电子显微镜(SEM)、 能量色散光谱仪(EDS)、 透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)等对样品的结构和形貌进行了表征. 以罗丹明B的脱色降解为模型反应, 考察了样品的光催化性能和储能光催化性能. 结果表明, 花状WO3微球包裹在TiO2纤维上, 得到了具有异质结构的WO3/TiO2复合纤维光催化剂. WO3与TiO2复合有利于光生载流子的输运和分离, 增强了体系的量子效率, 提高了光催化活性. WO3/TiO2 复合纤维经光照处理后, 在黑暗条件下显示出储能光催化特性.

Preparation and Energy Stored Photocatalytic Properties of WO3/TiO2 Composite Fibers

Heterostructured WO3/TiO2 composite fibers were prepared via electrospinning fabrication of anatase fibers by adopting n-butyl titanateTi(OBu)4] as precursors and hydrothermal growth of WO3 nanostructures on anatase fibers substrate.The morphology and structure of WO3/TiO2 composite fibers were characte-rized by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),transmission electron microscopy(TEM) and high resolution transmission electron microscopy(HRTEM) techniques.The results showed that flower-like WO3 microsphere could evenly grow on the TiO2 fibers surface and thus heterostructured WO3/TiO2 composite fibers were successfully obtained.By employing Rhodamine B degradation as the model reaction,the WO3/TiO2 heterostructures showed enhanced photocatalytic efficiency compared with the bare TiO2 fibers under UV light irradiation.The enhanced photocatalytic efficiency could be ascribed to the promoted electron-hole pairs separation induced by the heterojunction and thus enhanced quantum efficiency.Degradation experiment displays that Rhodamine B can be degraded in darkness by the WO3/TiO2 composite fibers photocatalyst with energy storage degradation activity.