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]BF4)为N源,采用阳极氧化法制备N掺杂TiO2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TiO2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TiO2纳米管阵列的光催化活性.结果表明,N掺杂TiO2纳米管阵列对亚甲基蓝溶液的降解率明显高于未掺杂的TiO2纳米管阵列.这是因为N掺杂后不仅使TiO2禁带宽度变窄,并且N掺杂进入TiO2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 TiO2 nanotube (NT) arrays were prepared by anodization in electrolytes containing HF,ionic liquid 1-n-butyl-3-methyl-imidazolium tetrafluoroborate ([BMIM]BF4) and water.The ionic liquid,[BMIM]BF4,was used as the nitrogen source.The surface morphology and the composition of samples were characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),Fourier transform infrared spectroscopy (FT-IR) and UV-Vis diffuse reflectance spectra (DRS).The photocatalytic activities of samples were investigated by the degradation of methylene blue (MB) under spherical xenon lamp.The results show that the degradation rate of MB over N-doped TiO2 NT arrays is obviously higher than that over undoped TiO2 NT arrays.The above results are caused by the increased oxygen vacancies and the decreased band gap.
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