SnO2/TiO2复合纳米纤维的制备及光催化性能

摘要

采用静电纺丝技术,以聚乙烯吡咯烷酮和钛酸正丁酯为前驱体,制得锐钛矿相TiO2纳米纤维,并以此为模板,采用水热方法制备了具有异质结构的SnO2/TiO2复合纳米纤维.利用扫描电子显微镜(SEM)、X射线能量色散光谱(EDS)、透射电子显微镜(TEM)和X射线衍射(XRD)等分析测试手段对产物形貌和结构进行了表征.结果表明,SnO2纳米粒子均匀地生长在TiO2纳米纤维表面,形成了异质结构的SnO2/TiO2复合纳米纤维.通过改变反应物浓度,能有效地实现SnO2/TiO2复合纳米纤维的可控合成.以罗丹明B为模拟污染物,考察了SnO2/TiO2复合纳米纤维的光催化性能,结果表明,该复合纳米纤维的光催化活性明显高于纯TiO2纳米纤维,初步探讨了光催化反应机理.%Heterostructured SnO2/TiO2 composite nanofibers were prepared via electrospinning fabrication of anatase nanofibers by adopting polyvinylpyrrolidone(PVP) and n-butyl titanate as precursors and hydrothermal growth of SnO2 nanostructures on anatase nanofibers substrate. The morphology and structure of SnO2/TiO2 composite nanofibers were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy(EDX), transmission electron microscopy(TEM) and X-ray diffraction(XRD) analysis. The results showed that SnO2 nanoparticles could evenly grow on the TiO2 nanofibers surface and thus heterostructured SnO2/TiO2 composite materials were successfully obtained. By employing rhodamine B degradation as the model reaction, the SnO2/TiO2 heterostructures showed enhanced photocatalytic efficiency compared with the bare TiO2nanofibers under UV light irradiation. The mechanism for the enhancement of photocatalytic activity of heterostructurod nanofibers was also discussed.