TiO_2纳米管阵列光电极的制备及光催化性能研究

Study on preparation and photocatalytic performance of TNT photoelectrodes prepared under different conditions

采用阳极氧化法在不同的条件下制备了TiO2纳米管阵列(TNT)光电极,利用SEM、XRD等手段对电极的表面形貌、晶体结构进行了分析和表征。以Rh.B为目标污染物,研究了不同电极的光催化和光电催化性能。结果表明:当氧化电压为20 V时,可获得形貌规则的有序排列的TiO2纳米管光电极,纳米管管径为80～120 nm;经500℃退火后的TNT光电极晶型为锐钛矿和金红石型TiO2组成的混晶结构,具有最高的光催化活性,辐照2 h后,Rh.B降解率可以达到69.5%。当外加偏压为2.0 V时,降解速率常数增大了1.8倍。

TiO2 nanotube array（TNT） photoelectrodes were fabricated by anodic oxidation method on titanium（Ti） foil.The morphology,structure and composition of TNT photoelectrodes were characterized by SEM and XRD.The photocatalytic and photoelectrocatalytic activity were investigated using Rh.B as target pollutants.The results showed that TiO2 nanotube arrays could be obtained at 20 V.The diameters of nanotubes were 80～120 nm.When the photoelectrodes were annealed at 500 ℃,the crystals of TNT photoelectrodes were composed of anatase and rutile TiO2 and exhibited the optimum photocatalytic activity.After 120 min illumination,the degradation rate of Rh.B could arrive at 69.5%.When the bias potential was applied,the degradation rate constant increased 1.8 times.