Electrocatalytic Degradation of Methyl Orange using Nano-Fe3O4 Supported on Conductive Carbon Black as Particle Electrode

Using conductive carbon black (CCB) as a carrier, a heterogeneous catalyst with Fe 3 O 4 as the active material (Fe 3 O 4 /CCB) was prepared by the impregnation method, and its performance in degrading of high-concentration methyl orange (MO) wastewater in the three-dimensional electro-Fenton system (3DEF) was explored. Characterization by TEM and XRD showed that Fe 3 O 4 was uniformly loaded on CCB, and due to the synergistic effect of Fe 3 O 4 and CCB in promoting degradation of pollutants, the degradation rate of this catalyst was 2.14 times higher than that of Fe 3 O 4 alone. Under the optimal conditions, the COD removal rate and MO decolorization rate reached the maximum, values of 75.02% and 93.75%, respectively. After 5 cycles, the MO degradation rate was still 83.83%, indicating that the prepared particle electrode has good reusability. In addition, a reasonable catalytic mechanism of the 3DEF system for MO mineralization was proposed, confirming that the hydroxyl radicals were particularly important in the oxidation.