Activation of low concentration persulfate with CoFe 2 O 4 @rGO under UV radiation to efficiently remove NO from flue gas

Activating low concentration persulfate (PS) to realize high-efficiency oxidation of NO is the key to reduce the cost of denitration by PS. In this paper, cobalt ferrite anchored reduced graphene oxide (CoFe ₂ O ₄ @rGO) was prepared by hydrothermal synthesis, and coupled with ultraviolet light (UV) was used to activate low concentration PS to oxidize and absorb NO in flue gas. The study found that UV irradiation significantly improved the catalytic performance of CoFe ₂ O ₄ @rGO, and the greater UV power, the higher the denitration efficiency. It can not only activate PS, but also reduce the recombination probability of photoelectrons and holes of CoFe ₂ O ₄ . With the aid of the oxidation ability of surface holes and the super electron transfer ability of rGO, the high-efficiency denitration of low-concentration PS is realized. When the UV was 18W, PS concentration was 0.02 mol/L, the dosage of CoFe ₂ O ₄ @rGO was 0.2 g/L, the initial pH of solution was 6, 90% and 96.1% NO were oxidized to nitric acid under 45℃ and 70℃ respectively. Finally, CoFe ₂ O ₄ @rGO was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET specific surface area and hysteresis cycle, and the denitrification mechanism of photo-assisted CoFe ₂ O ₄ /rGO activated PS was speculated.