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中文摘要：
采用溶胶–凝胶法并结合静电纺丝技术制备PVP[poly（vinyl pyrrolidone）]/[La（NO3）3＋Fe（NO3）3]复合微米带,将复合微米带在800℃焙烧8h后得到LaFeO3纳米带。采用差热–热重分析、X射线衍射、场发射扫描电子显微镜、能量色散谱、透射电子显微镜对样品进行表征,研究了LaFeO3纳米带与LaFeO3纳米纤维对罗丹明B的光催化降解效果。结果表明：PVP/[La（NO3）3＋Fe（NO3）3]复合微米带表面光滑,宽度为（17.5±1.5）μm,厚度约为610nm;LaFeO3纳米带为多孔结构,正交晶系,空间群为Pn＊a,宽度为（5.1±1.4）μm,厚度约为100nm。LaFeO3纳米带对罗丹明B的光催化效果优于LaFeO3纳米纤维,紫外光照射180min后罗丹明B的降解率达到89.6%。
英文摘要：
The PVP [poly（vinyl pyrrolidone）]/[La（NO3）3＋Fe（NO3）3] composite microbelts were fabricated via the combination of a sol–gel method with electrospinning.The LaFeO3 nanobelts were obtained by the calcination of the fabricated composite microbelts at 800 ℃ for 8 h.The resultant samples were characterized by thermogravimetric–differential thermal analysis,X-ray diffractometry,scanning electron microscope,energy dispersive spectroscopy and transmission electron microscope,respectively.The photocatalytic activity of LaFeO3 nanobelts and LaFeO3 nanofibers were investigated by using rhodamine B as a degradation agent.It was found that the surface of PVP/[La（NO3）3＋Fe（NO3）3] composite microbelts was smooth.The width and thickness of the composite microbelts were（17.5 ± 1.5） μm and 610 nm,respectively.The LaFeO3 porous nanobelts were orthorhombic with the space group of Pn＊a.The width and thickness of LaFeO3 nanobelts were（5.1 ± 1.4） μm and 100 nm,respectively.It was revealed that the photocatalytic activi-ties of LaFeO3 nanobelts were better than that of LaFeO3 nanofibers,and the degradation rate of rhodamine B could reach 89.6% after the reactive mixture was illuminated by ultraviolet for 180 min.
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