Ag掺杂TiO2纳米管阵列的制备及光电催化降解氨氦废水

摘要

采用光化学沉积法、光还原法以及光电沉积法3种不同的掺杂方法,通过控制掺杂时间来控制Ag的担载量制备出Ag-TiO2纳米管阵列.采用场发射扫描电镜(FE-SEM)、X-射线衍射(XRD)、X-射线光电子能谱(XPS)、X-射线荧光光谱(PL)对样品进行表征.用氨氮废水的光电催化降解反应评价其催化活性,研究不同的掺杂方法以及不同的Ag担载量对TiO2纳米管阵列光催化性能的影响.结果表明:适量的Ag的引入有利于光催化效率的提高,即Ag的掺杂量存在一个最佳值,光电沉积60 s制备的样品具有最佳的光电催化效率.%Ag-TiO2 nanotube arrays were prepared by photochemical deposition, photoreduction deposition and photoelectric deposition method, respectively. The amount of Ag loading was controlled by varying deposition time. The samples were characterized by FE-SEM, XRD, XPS and PL. The catalytic activity of Ag-TiO2 nanotube arrays was evaluated by photo-electro-catalytic degradation of ammonia nitrogen wastewater. The results show that the photocatalytic activity of TiO2 nanotube arrays could be greatly enhanced at an optimized loading of Ag. The sample prepared by photoelectric deposition for 60 s exhibits the best photocatalytic activity.