Microwave-Induced Catalytic Oxidation of High-Concentration Dye Effluent Using CuFe<sub>2</sub>O<sub>4</sub>/ACF Combined with O<sub>3</sub>

Abstract

Ozone-microwave catalytic oxidation system (O<sub>3</sub>/MIOP) is a new deep composite oxidation technology based on ozone and microwave-induced catalysis. In this paper, CuFe<sub>2</sub>O<sub>4</sub> loaded on activated carbon fiber (CuFe<sub>2</sub>O<sub>4</sub>/ACF) was prepared by sol-gel method as microwave catalyst to degrade 6 L Basic Brown (500 mg/L) and actual wastewater with O<sub>3</sub>/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 CuFe<sub>2</sub>O<sub>4</sub>/ACF catalyst and H<sub>2</sub>O<sub>2</sub> are added to the reactor. The results show that under the co-treatment of 60 min O<sub>3</sub> 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 O<sub>2</sub>•- are measured to be the main active group in the process of degradation of Basic Brown under O<sub>3</sub>/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.