TiO2/LaFeO3微纳米纤维的可控制备及光催化性能简

利用静电纺丝技术及水热合成法制备了TiO2/LaFeO3异质结构. 采用场发射扫描电子显微镜(FE-SEM),X射线衍射(XRD),傅里叶变换红外(FTIR)光谱和紫外-可见漫反射光谱(UV-Vis)等手段对TiO2/LaFeO3微纳米纤维的结构和表面形态进行表征. 通过亚甲基蓝(MB)光降解反应研究了其光催化性能. 结果表明,不完全碳化TiO2纤维表面的缺陷位点是LaFeO3纳米粒子的有利生长点. TiO2/LaFeO3异质结材料的带隙明显窄于TiO2,光催化活性得到提高;经140 min紫外光照射后,TiO2/LaFeO3异质结催化剂对MB的降解率为65.34%,分析和探讨了其光催化机理.

Controllable Synthesis and Photocatalytic Activity of TiO2/LaFeO3 Micro-nanofibers

TiO2/LaFeO3 heterostructures were fabricated by electrospinning technique and hydrothermal synthesis method. The physicochemical properties of the catalysts were characterized by scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and ultraviolet-visible diffuse reflectance spectra(UV-Vis). The photocatalytic activity of TiO2/LaFeO3 micro-nanofibers toward the decomposition of methylene blue(MB) was investigated. The results indicate that defect sites of incompletely carbonized TiO2 fibers are favorable for the growth of LaFeO3 nanoparticles. The band gap of TiO2/LaFeO3 heterostructures is lower than TiO2 improving the photocatalytic activity. After 140 min TiO2/LaFeO3 heterostructures exhibited 65.34% for MB under UV light, and the photocatalytic mechanism of TiO2/LaFeO3 heterostructures were analyzed and discussed.