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采用微等离子体氧化法,在H2SO4溶液为电解液中以钛合金为基体制备原位生长的TiO2薄膜,并以罗丹明B溶液为目标污染物测试其光催化性能。为提高所得TiO2薄膜的光催化性能,向电解液中添加了不同浓度的草酸铌,制备了原位Nb掺杂TiO2薄膜。利用扫描电镜(SEM)和X射线衍射仪(XRD)分别对Nb掺杂前后的TiO2薄膜表面形貌、元素组成和晶体结构进行了分析。结果表明,Nb掺杂能使介孔TiO2晶粒细化,比表面积增大,Nb对TiO2晶相组成影响不大,但对晶胞参数有所影响,Nb掺杂可有效提高TiO2的光催化活性,其中当草酸铌为1.2g/L时,对初始浓度为10 mg/L罗丹明B溶液90min的降解率可达到85%,表现出最强的光降解能力。
The in situ growth of TiO2 thin film was prepared by the micro-plasma oxidation method using H2SO4 solution as the electrolyte and the photocatalytic performance of the TiO2 film as the target pollutant. In order to improve the photocatalytic performance of the obtained TiO2 thin films, different concentrations of niobium oxalate were added to the electrolyte to prepare Nb-doped TiO2 thin films. The surface morphology, elemental composition and crystal structure of Nb thin films before and after Nb doping were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that Nb doping can refine the grain size of mesoporous TiO2 and increase the specific surface area. Nb has little effect on the crystalline phase of TiO2, but has an impact on the unit cell parameters. Nb doping can effectively increase the photocatalytic activity of TiO2 When the content of niobium oxalate was 1.2 g / L, the degradation rate of rhodamine B solution with the initial concentration of 10 mg / L was 85% for 90 min, which showed the strongest photodegradation ability.