基于新型多孔二氧化铅电极处理哌啶

为了开发更经济有效的电化学氧化技术,制备了可在过滤模式(flow-through)下运行的新型电化学膜电极(REM),并在多孔钛板上通过模板电沉积法制备具有三维有序多孔结构的PbO2膜电极(3DEM-PbO2)。研究了传统序批式反应器(BR)和电化学过滤器(EFR)对哌啶的处理效果,发现3DEM-PbO2在EFR中对流传质更强,氧化能力更强。还探究了不同操作参数(电流密度、反应器流速和哌啶初始浓度)对电化学降解性能的影响。3DEM-PbO2对哌啶去除效率随电流密度增大而提高,在20 m A/cm2的电流下,120 min时可达到99.9%;随水流速度增大而提高,在10 m L/s的水流速度下,180 min时可达到99.9%;随初始浓度增大而减少,在哌啶浓度为25 mg/L时,120 min可达到99.9%。因此3DEM-PbO2过滤器在处理哌啶过程中有很大的潜力。

Study on the treatment of piperidine with a new lead dioxide electrode

To develop a more cost-effective electrochemical oxidation technique, we have prepared a novel reactive electrochemical membrane(REM) that can operate in a flow-through mode. We prepared a threedimensional ordered macroporous PbO2(3DEM-PbO2) with a threedimensional ordered porous structure by template electrodeposition on porous titanium plate. In this experiment, the effect of traditional sequencing batch reactor(BR) and electrochemical filter reactor(EFR) on the treatment of piperidine was studied. It was found that 3DEMPbO2 has stronger convective mass transfer and higher oxidation ability in EFR. At the same time, the experiment also explored the effects of different operating parameters(including current density, reactor flow rate and piperidine initial concentration) on the electrochemical degradation performance of piperidine during the reaction. The removal efficiency of piperidine by 3DEM-PbO2 increased with current density. At 20 mA/cm2, it could reach 99.9% at 120 min. Increasing the water flow rate to the 10 mL/s, it could remove 99.9% of piperidine at 180 min. The removal decreased with the increase of initial concentration. When the concentration of piperidine was 25 mg/L, the degradation of piperidine could reach 99.9% at 120 min. In summary,the 3DEM-PbO2 filter has great potential in the treatment of piperidine.