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以HF水溶液为电解液,离子液体(1-丁基-3-甲基咪唑四氟硼酸盐[BMIM]BF_4)为N源,采用阳极氧化法制备N掺杂TiO_2纳米管阵列。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子谱(XPS)、傅里叶变换红外光谱(FT-IR)和紫外-可见漫反射光谱(DRS)对N掺杂TiO_2纳米管阵列的表面形貌、晶型和氮元素的掺杂方式进行分析。以球形氙灯为光源,亚甲基蓝溶液为目标降解物测试N掺杂TiO_2纳米管阵列的光催化活性。结果表明,N掺杂TiO_2纳米管阵列对亚甲基蓝溶液的降解率明显高于未掺杂的TiO_2纳米管阵列。这是因为N掺杂后不仅使TiO_2禁带宽度变窄,并且N掺杂进入TiO_2晶格中形成O-Ti-N键和Ti-O-N键,使氧空位数量增加,从而使其光催化活性提高。
N-doped TiO 2 nanotube arrays were prepared by anodic oxidation using HF as electrolyte and ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate [BMIM] BF 4) as N source. The properties of N-doped TiO 2 nanostructures were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible diffuse reflectance spectroscopy Tube array surface morphology, crystal type and nitrogen doping methods were analyzed. The photocatalytic activity of N-doped TiO 2 nanotube arrays was tested with spherical xenon lamp as the light source and methylene blue solution as the target degradation product. The results showed that the degradation rate of methylene blue solution of N-doped TiO 2 nanotube arrays was significantly higher than that of undoped TiO 2 nanotube arrays. This is because N doping not only narrows the forbidden band width of TiO 2, but also N-doping into the lattice of TiO 2 forms O-Ti-N bond and Ti-ON bond, increasing the number of oxygen vacancies and making the photocatalytic activity improve.