Ti_5O_9-Ti_4O_7电极电化学处理2,4,6-三硝基苯酚废水

Electrochemical Treatment of 2,4,6-Trinitrophenol Wastewater on Ti_5O_9-Ti_4O_7 Electrode

采用压片-烧结法制备了Ti5O9-Ti4O7电极,采用XRD和SEM技术对Ti5O9-Ti4O7电极进行了表征。以自制的Ti5O9-Ti4O7电极为阳极,电解处理含2,4,6-三硝基苯酚(TNP)的模拟废水,考察了电流密度、电解质质量浓度、废水p H、废水温度和反应时间等因素对废水COD去除率和TNP降解率的影响。表征结果显示:该电极的主要成分为Ti5O9,并含有部分Ti4O7;该电极的比表面积较大。Ti5O9-Ti4O7电极电解处理含TNP废水的最佳实验条件为:电流密度20 m A/cm2、电解质Na2SO4质量浓度6.0 g/L、废水p H为7、废水温度30℃。在此最佳条件下电解反应180 min后,COD去除率为90.6%,TNP降解率为93.9%,表明Ti5O9-Ti4O7电极具有较高的催化能力和电流效率。

The Ti5O9-Ti4O7electrode was prepared by pelleting-simering method and characterized by XRD and SEM. Using the self-made Ti5O9-Ti4O7 electrode as anode, the simulated 2, 4, 6-trinitrophenol （TNP） wastewater was treated by electrolysis. The factors affecting COD removal rate and TNP degradation rate were investigated. The characterization results showed that the electrode contains a large number of Ti509 and a small amount of Ti407 and its specific surface is large. The optimum conditions for electrolytic treatment of TNP wastewater on Ti5O9-Ti4O7 electrode are as follows： current density 20 mA/cm2, mass concentration of electrolyte Na2SO4 6.0 g/L, wastewater pH 7, wastewater temperature 30 ℃. After electrolysis under these conditions for 180 min, the COD removal rate and TNP degradation rate are 90.6% and 93.9%, respectively, indicating that the Ti5O9-Ti4O7 electrode has high catalytic ability and current efficiency.