TiO2纳米管阵列催化剂的制备及其光电耦合降解苯酚研究

Study on preparation of TNA catalyst and photoelectricity coupling degradation of phenol

纳米材料TiO2纳米管阵列(TNA)具有独特的、高度有序的阵列结构和良好的降解苯酚污染物的性能。采用电化学阳极氧化法制备TNA,以苯酚作为模拟污染物,考察了在光电协同耦合作用下TNA降解苯酚的效果及动力学规律。实验结果表明:在电流密度为17.78mA/cm^2、pH=3.0的条件下,采用光电耦合降解苯酚,反应40min后质量浓度为5mg/L的苯酚去除率可达100%。反应动力学分析结果表明,苯酚的光电耦合降解过程遵循准一级动力学规律,其反应速率常数为0.1371min^-1,相关系数R^2为0.998。

The titanium dioxide nanotube array(TNA)has the characters of highly ordered array structure,and good degrading performance on phenol pollutants in the water.Electrochemical anodic oxidation method was used to prepare TNA.Phenol solution was selected as simulated pollutants.The effluence of phenol electrolysis degradation was investigated.The experiment also was constructed to reveal the effect and kinetics of TNA degradation of phenol by photo-electrical coupling technology.The results showed that the removal rate of 5 mg/L concentration of phenol solution was 100%under the optimum condition of pH=3.0,17.78 mA/cm2 current density.The results of reaction kinetics analysis showed that the phenol degradation followed the first order kinetics law and the reaction rate constant of was 0.1371 min-1,R2=0.998.