基于Pb₃O₄磁性颗粒的2.5维电极体系构建及性能研究

In order to realize the efficient degradation of organic pollutants, a 2.5-dimensional electrode system based on Pb₃O₄ magnetic particles is constructed. Fe₃O₄/Pb₃O₄ magnetic particles are prepared by impregnation-thermal decomposition method. To obtain the optimum surface element contents, crystal structure and particle magnetism, six coating times of the particles are determined. Comparing the cyclic voltammetry properties, hydroxyl radical yields and mass transfer coefficients, it is found that the 2.5D electrode system is superior to the 2D electrode system in performance, and the optimum particle dosage is determined as 5 g. Finally, acid red G is used as the target to compare the electrocatalytic performance of the two electrode systems. The results show that the decolorization rate, COD removal efficiency, TOC removal efficiency and COD degradation energy consumption of the 2.5D electrode system at 120 min reach 100%, 67%, 42.9% and 0.62 kW•h/g, respectively, which are better than the performances of the 2D electrode system. The adhesion of Fe₃O₄/Pb₃O₄ magnetic particles on the electrode surface widens the solid-liquid interface area of the 2.5D electrode system and improves the mass transfer conditions.