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以静电纺丝技术制备的TiO_2纳米纤维为模板和反应物,采用水热法合成了具有异质结构的La_2Ti_2O_7/TiO_2复合纳米纤维。将其作为光催化剂,在紫外光和可见光环境中,对模拟有机污染物罗丹明B进行光催化降解。采用XRD,SEM和HRTEM等分析测试手段对样品的组成及形貌进行表征,通过UV-vis漫反射光谱表征其光吸收性能及禁带宽度,测试光催化性能。结果表明:TiO_2纳米纤维形貌得以完好保持,La_2Ti_2O_7纳米晶粒均匀地生长在TiO_2纳米纤维表面形成异质结,减小了TiO_2的带隙宽度,光催化活性提高,光谱响应范围拓宽到可见光区。在紫外光和可见光下均具有良好的光催化活性。
The TiO 2 nanofibers prepared by electrospinning technique were used as template and reactant. La 2 Ti 2 O 7 / TiO 2 composite nanofibers with heterostructures were synthesized by hydrothermal method. As a photocatalyst, the simulated organic pollutant Rhodamine B was photocatalytically degraded in the ultraviolet and visible light environments. The composition and morphology of the samples were characterized by XRD, SEM and HRTEM. The photocatalytic properties of the samples were tested by UV-vis diffuse reflectance spectroscopy. The results show that the morphology of TiO_2 nanofibers can be well preserved. The La_2Ti_2O_7 nanocrystals uniformly grow on the surface of TiO_2 nanofibers to form heterojunction, which reduces the band gap width of TiO_2, improves the photocatalytic activity and broadens the spectral response range to visible region . In the UV light and visible light have good photocatalytic activity.