Synthesis of Mo2C@CeO2@Fe3O4 particles for enhancing three-dimensional heterogeneous electro-Fenton degradation of MIT and HEDP

Mo2C@Fe(3)O(4 )and three kinds of MO2-doped Mo2C@Fe3O4 were successfully fabricated as the Mo2C@CeO2@Fe3O4 Mo2C@CeO2@Fe3O4 and Mo2C@CeO2@Fe(3)O(4)particles for the degradation of 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane in a three-dimensional electro-Fenton system. The catalyst particles showed an enhancement for the catalytic activity in the system. Furthermore, the Mo2C@CeO2@Fe(3)O(4)particles exhibited superior activity for 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane degradation compared to the other two particles. Based on the characterization of the synthesized particles, leaching concentration of Fe2+, generation of H2O2, center dot OH, O-2(center dot-) the reasons for the difference in pollutant degradation performance among the three type particles were comprehensively analyzed. At last, some important experimental parameters, such as particles dosage, current density and aeration intensity, which would obviously affect MIT and HEDP degradation performance were studied. Using the Mo2C@CeO2@Fe3O4 as catalytic particles, optimal 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane degradation rates were 97.2% and 73.8% with 0.5 g of particle dosage, 97.22% and 73.75% with 300 mA of current density, and 97.28% and 73.71% with 0.1 L min(-1 )of aeration intensity.