Study On Degrading 3,4- Dichlorobenzotrifluoride Using ZrO₂/Fe₃O₄、CeO₂/Fe₃O₄、TiO₂/Fe₃O₄-H₂O₂ Fenton-like System

Heterogeneous Fenton-like system using subgroup metal oxides as solid phase carrier is one of the advanced oxidation technology. Subgroup metal oxides could urge H₂O₂ producing hydroxyl oxygen free radicals. 3,4-Dichlorobenzotrifluoride（3,4-DCBTE） is one of the diphenyl ether herbicide important intermediates in organic synthesis. 3,4-Dichlorobenzotrifluoride（3,4-DCBTE） was degraded with oxidation treatment by means of heterogeneous Fenton-like system, using nanoscale Fe₃O₄/ZrO₂、Fe₃O₄/CeO₂ and Fe₃O₄/TiO₂ as solid phase of heterogeneous Fenton-like system. This innovative nanoscale catalyst was prepared by the impregnated method. To find the most optimum catalytic conditions of nanoscale Fe₃O₄/ZrO₂ 、Fe₃O₄/CeO₂ and Fe₃O₄/TiO₂, the influence factors were investigated.The results indicated that the treatment effect of 3,4-DCBTE was significantly improved by adding nanoscale Fe₃O₄/CeO₂. As the temperature increasing, the catalytic effect of nanoscale Fe₃O₄/ZrO₂、Fe₃O₄/CeO₂ and Fe₃O₄/TiO₂ catalyst was constantly improved obviously. As the pH reducing, the effect of nanoscale Fe₃O₄/ZrO₂ 、Fe₃O₄/CeO₂ and Fe₃O₄/TiO₂ catalyst was also improved. With the increase of dosage of hydrogen peroxide（H₂O₂）, the degradation efficiency of 3,4-DCBTE firstly increased and then decreased. An increase with the amount of catalyst could enhance the degradation effect in Fe₃O₄/ZrO₂-H₂O₂ Fenton-like system. But in Fe₃O₄/CeO₂-H₂O₂ and Fe₃O₄/TiO₂-H₂O₂ Fenton-like system, there was an optimum amount. If the molar ratio of solid phase is 1: 1, the catalytic effect was better than others doping ratio catalysts.The results also suggested that the reaction process followed the first-order kinetics. As the temperature increasing, the reaction rate constant was constantly improved obviously. The degradation of 3,4-DCBTE in Fe₃O₄/ZrO₂-H₂O₂ 、Fe₃O₄/CeO₂-H₂O₂ and Fe₃O₄/Ti O2-H₂O₂ Fenton-like system is a endothermic reaction. The apparent activation energy are respectively 23.62、30.26 and 35.95 kJ/mol.