Microwave-Induced Catalytic Oxidation of High-Concentration Dye Effluent Using CuFe₂O₄/ACF Combined with O₃

Ozone-microwave catalytic oxidation system (O₃/MIOP) is a new deep composite oxidation technology based on ozone and microwave-induced catalysis. In this paper, CuFe₂O₄ loaded on activated carbon fiber (CuFe₂O₄/ACF) was prepared by sol-gel method as microwave catalyst to degrade 6 L Basic Brown (500 mg/L) and actual wastewater with O₃/MIOP technique. After the wastewater is subjected to ozone treatment for a period of time, it flows into the reactor from the water inlet through a peristaltic pump, and at the same time, a certain amount of CuFe₂O₄/ACF catalyst and H₂O₂ are added to the reactor. The results show that under the co-treatment of 60 min O₃ and 5 min MIOP, the decolorization rate of basic brown at 500 mg/L reached 60%, and the B/C value increased from the initial 0.18 to 0.32.As to the actual wastewater, the B/C value after degradation tends to 0.3, which is easy to the next biochemical treatment. Furthermore, •OH and O₂•- are measured to be the main active group in the process of degradation of Basic Brown under O₃/MIOP treatment. These two reactive species accelerate the degradation of the dye during the reaction, thus increasing the reaction rate. This composited oxidation technology system was proven to be suitable and of practical value in high-concentration dye effluent treatment.