TiO_2纳米管阵列光催化降解苯酚

Photocatalytic Degradation of Phenol by Self-organized Titanium Dioxide Nanotube Arrays

采用电化学阳极氧化法在钛基体上制得了高度致密的、有序的、均匀的TiO2纳米管阵列。用SEM、XRD等对其表面形貌和结构晶型进行了表征和分析。以TiO2纳米管阵列为光催化剂对废水中典型的有机污染物——苯酚进行了光催化降解,考察了影响光催化降解速率的因素。结果表明,在紫外光照下,苯酚水溶液的pH=3、ρ(苯酚)=10.0 mg/L时,具有锐钛矿相结构的TiO2纳米管阵列的光催化效果最好,相同条件下与溶胶凝胶法制备的纳米TiO2颗粒膜的光催化降解速率进行对比,前者比后者提高了近一倍。

High-density,well-ordered and uniform titanium oxide nanotube arrays were prepared by electrochemical anodic oxidation.The morphology and crystal structure of the TiO2 nanotubes were characterized and analyzed by SEM and XRD.As a photocatalyst,TiO2 nanotube arrays were used to degrade phenol which is a typical organic pollutant in wastewater.The photocatalytic degradation under UV irradiation is most effective with anatase TiO2 nanotube arrays when pH of phenol solution is 3 and mass concentration of phenol is 10.0 mg/L. Compared with TiO2 nanoparticle coatings prepared by solgel process, the photocatalytic degradation rate of TiO2 nanotube arrays is almost doubled under the same experimental condition.