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在含有乙醇的氢氟酸溶液中,用阳极氧化法制备了高度取向的TiO2纳米管阵列,并用扫描电子显微镜(SEM)、X射线衍射(XRD)、拉曼光谱(Raman)、紫外-可见漫反射(DRS)和荧光光谱(PL)对样品进行表征,探讨了TiO2纳米管阵列的形成机理.结果表明,制备的TiO2纳米管阵列垂直生长于钛基底表面,分布均匀,管径约为90nm,管壁厚约20nm,管长约400～500nm,并且表现出更大的禁带宽度和良好的光致发光特性.此外,使用该纳米管对对氯苯酚的光电催化降解实验表明,光电催化效率明显高于光催化和电化学过程之和,表现出一定的光电协同作用;施加的阳极偏压也存在一个最佳值.
In a hydrofluoric acid solution containing ethanol, a highly oriented TiO2 nanotube array was prepared by anodic oxidation and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, UV- (DRS) and fluorescence spectroscopy (PL), the formation mechanism of TiO2 nanotube arrays was discussed.The results show that the prepared TiO2 nanotube arrays grow vertically on the surface of titanium substrate with a uniform diameter of about 90 nm, The thickness of the tube is about 20 nm and the length of the tube is about 400-500 nm, exhibiting a larger forbidden band width and good photoluminescence properties. In addition, the photoelectrocatalytic degradation of p-chlorophenol using the nanotube shows that the photoelectrocatalytic efficiency Which is obviously higher than the sum of photocatalytic and electrochemical processes and shows some photoelectric synergism. There is also an optimum value for the applied anode bias voltage.