CeO2纳米颗粒修饰TiO2纳米管阵列及其光催化性能

摘要

TiO2 nanotube arrays were prepared by anodic oxidation method on the titanium substrate,and CeO2 nanoparticles were deposited on the TiO2 nanotube arrays by the microwave homogeneous precipi-tation method.Field emission scanning electron microscopy (FESEM),energy-dispersive spectrometry (EDS),X-ray diffraction(XRD)and UV-Vis diffuse reflectance spectroscopy (DRS)were used to charac-terize the nanocomposites.The electrochemical impedance spectroscopy(EIS)and the performance of pho-tocatalytic degradation of methylene blue were investigated.The results show that the CeO2 nanoparticles modification can broaden the absorption spectrum of TiO2 nanotube arrays to the visible light region,rela-tive to pure TiO2 nanotube arrays.The charge transfer resistance of CeO2/TiO2 composite nanotube arrays is decreased,the efficiency of electron-cavity separated is increased,the carrier transport rate is faster.The CeO2/TiO2 nanotube arrays photocatalyst show higher photocatalytic activity and the methylene blue deg-radation rate can reach 80% by using photocatalyst in 4 hours.%采用阳极氧化法在钛基底板上制备了TiO2纳米管阵列,利用微波辅助均相沉淀法将 CeO2纳米颗粒修饰到TiO2纳米管阵列上。利用场发射扫描电镜(FESEM),能谱仪(EDS),X射线粉末衍射仪(XRD),紫外可见漫反射光谱(UV-Vis),X射线光电子能谱(XPS)等测试手段对所制备的复合材料进行表征,并对其电化学阻抗谱及光催化降解亚甲基蓝染料废水性能进行考察。结果表明：CeO2纳米颗粒的修饰将TiO2纳米管阵列的光响应范围拓宽至可见光区域；相对于TiO2纳米管阵列,CeO2/TiO2复合纳米管阵列电荷转移阻力减小,电子-空穴的分离效率提高,载流子的传输速率较快。复合材料表现出较高的光催化活性,其在4h内对亚甲基蓝光催化降解率可达80%。