研究三维电催化体系中粒子电极位置对电催化反应效能的影响

为了探究三维电催化反应器填充粒子的放置位置对电催化反应速率的影响，本文以亚甲基蓝为模拟有机废水，球状石墨颗粒为研究粒子电极，利用COMSOL Multiphysics软件模拟三维电催化反应器内的电势分布。以粒径大小、电势和位置为自变量，以一级反应动力学常数为因变量建立对数回归模型。结合模型预测了反应器不同位置的粒子电极降解有机污染物的效能。模拟结果表明，在三维电催化氧化反应器内粒子电极对污染物降解的反应效能是不均匀的，增加电场强度可以改变粒子电极电催化反应效能的分布，其中越靠近阳极端位置的粒子电极其降解污染物的能力越高。粒子颗粒内部不同位置之间的电催化反应速率的差异较大，按照差异程度可大致分为三个区域并模拟了粒子电极内部不同位置的电催化反应效能分布。

Study on the effect of the position of the particle electrode on the electrocatalytic reaction efficiency in three dimensional electrocatalytic system

In order to explore the effect of particle position on the electrocatalytic reaction rate in three-dimensional electrocatalytic reactor,methylene blue was used as the simulated organic wastewater, and spherical graphite particles were used as the electron electrode, COMSOL Multiphysics software were used to simulate potential distribution in three dimensional electrocatalytic reactor. The logarithmic regression model was established with the particle size, potential and position as independent variables and the first-order kinetic constant as dependent variable. Combined with the model, the degradation efficiency of the particle electrodes at different positions in the reactor was predicted, the simulation results show that the reaction efficiency of particle electrode for pollutant degradation is uneven in the three-dimensional electro catalytic oxidation reactor, the increasement of the electric field intensity can change the distribution of electrocatalytic efficiency of particle electrode, the closer the particle electrode is to the anode position, the higher the ability of degradation of pollutants. The difference of electrocatalytic reaction rate between different positions in the particle is large. According to the degree of difference, it can be roughly divided into three regions, and the distribution of electrocatalytic reaction efficiency at different positions in the particle electrode is simulated.