Fe、N共掺杂TiO2纳米管阵列的制备及可见光光催化活性

应用电化学阳极氧化法结合浸渍和退火后处理制备了Fe和N共掺杂的TiO2纳米管阵列光催化剂,并用场发射扫描电镜(FESEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和俄歇电子能谱(AES)仪对其进行了表征.结果表明,Fe、N共掺杂对TiO2纳米管阵列的形貌和结构没有明显影响,Fe和N均掺入了TiO2晶格.紫外-可见(UV-Vis)漫反射光谱显示Fe和N共掺杂TiO2纳米管阵列的吸收带边较纯TiO2纳米管阵列和单一掺杂TiO2纳米管阵列红移,可见光吸收增强.以可见光催化降解罗丹明B(RhB)考察了材料的光催化活性,Fe和N共掺杂TiO2纳米管阵列对RhB的降解速率较纯TiO2纳米管阵列和单一掺杂TiO2纳米管阵列明显提高,证明了Fe、N共掺杂产生的协同效应提高了TiO2纳米管阵列在可见光照射下的光催化活性.

Preparation and Visible Light Photocatalytic Activity of Fe-N Codoped TiO2 Nanotube Arrays

Fe-N codoped TiO 2 nanotube arrays were fabricated by anodization of Ti,followed by wet immersion and annealing post-treatment.The doped TiO 2 nanotube array photocatalysts were characterized by field-emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and Auger electron spectroscopy(AES).The results indicated that Fe and N dopants had almost no effect on the morphology and structure of TiO 2 nanotube arrays,and that Fe and N were doped into the TiO 2 lattice.UV-Vis diffuse reflectance spectra showed that the absorption band edge of Fe-N codoped TiO 2 nanotube arrays exhibited a red shift compared with that of pure TiO 2 nanotube arrays and Fe-or N-doped TiO 2 nanotube arrays.The photocatalytic activity of Fe-N codoped TiO 2 nanotube arrays was evaluated by their ability to degrade rhodamine B under visible light irradiation.The degradation rate of rhodamine B over Fe-N codoped TiO 2 nanotube arrays was obviously higher than that over pure TiO 2 nanotube arrays and Fe-or N-doped TiO 2 nanotube arrays,which is attributed to the synergistic effect of the Fe and N codopants.