Preparation and Visible Light Photocatalytic Activity of Fe-N Codoped TiO_2 Nanotube Arrays

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.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.国家自然科学基金(51072170;21021002);福建省自然科学基金(2011J01057);国家基础科学人才培养基金(J1030415)资助项目---

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

Corresponding author. Email: [email protected]; Tel: +86-10-2184655[中文文摘]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. [英文文摘]Fe-N codoped TiO2 nanotube arrays were fabricated by anodization of Ti, followed by wet immersion and annealing post-treatment. The doped TiO2 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 TiO2 nanotube arrays, and that Fe and N were doped into the TiO2 lattice. UV-Vis diffuse reflectance spectra showed that the absorption band edge of Fe-N codoped TiO2 nanotube arrays exhibited a red shift compared with that of pure TiO2 nanotube arrays and Fe- or N-doped TiO2 nanotube arrays. The photocatalytic activity of Fe-N codoped TiO2 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 TiO2 nanotube arrays was obviously higher than that over pure TiO2 nanotube arrays and Fe- or N-doped TiO2 nanotube arrays, which is attributed to the synergistic effect of the Fe and N codopants.国家自然科学基金(51072170,21021002);福建省自然科学基金(2011J01057);国家基础科学人才培养基金(J1030415)资助项

The Preparation and Photoelectrochemical Performance of LaFeO_3-TiO_2 Nanotube Arrays

lAfEO3是一种具可见光响应的钙钛矿材料,将其与TIO2复合有望增强TIO2的可见光吸收,可有效促进光生电荷的分离.本工作采用超声浸渍处理的方法,在TIO2纳米管阵列表面复合lAfEO3颗粒,制得lAfEO3修饰的TIO2纳米管阵列光催化剂,并对其进行了表征.实验结果表明,lAfEO3有效增强了TIO2纳米管阵列在可见光区的光吸收,lAfEO3修饰的TIO2纳米管阵列光电极的光电流是TIO2纳米管阵列的7倍.这种催化剂的成功制备为可见光下降解有机污染物和光催化分解水制氢提供了一个新的途径.LaFeO3is a kind of perovskite-type material with visible light response.Coupling TiO2 with LaFeO3 is favorable to enhance the visible light absorption of TiO2 and efficiently promote the separation of photogenerated charges.In this work,LaFeO3 particles were deposited on the TiO2 nanotube arrays through ultrasonic-assisted impregnating method and LaFeO3-modified TiO2 nanotube arrays were obtained and characterized.Experimental results showed that LaFeO3 significantly enhanced the visible light absorption of TiO2 nanotube arrays,and the photo current of LaFeO3-modified TiO2 nanotube arrays was up to 7times as much as that of pure TiO2 nanotube arrays.The successful preparation of this catalyst offers a new route to photocatalytic degradation of organic pollutant and photocatalytic hydrogen production by splitting water under visible light irradiation.国家自然科学基金(21321062); 国家基础科学人才培养基金(J1310024