可见光驱动下氧掺杂氮化碳活化过硫酸盐降解罗丹明B

Oxygen-doped graphite-phase carbon nitride (O-g-C₃N₄) was synthesized by treatment of graphite-phase carbon nitride (g-C₃N₄) with hydrogen peroxide solution heat treatment, and O-g-C₃N₄ was characterized by SEM, XRD, XPS, UV-visDRS. The results show that the surface smoothness of O-g-C₃N₄ is reduced, the nanosheets have a step-like morphology, and the visible light absorption performance and catalytic performance have been significantly improved. Meanwhile, hydrogen peroxide solvent thermal treatment could effectively doped O atoms into g-C₃N₄ by replacing sp² bonding N atoms. Using an LED lamp with a wavelength of 430 nm as a visible light source, O-g-C₃N₄ is used to activate persulfate to degrade rhodamine B (RhB). The results show that the experimental system can greatly improve the removal rate of RhB. The optimal reaction conditions were the applied light source power of 18.00 W, the O-g-C₃N₄ dosage of 0.08 g•L^-1, the PS dosage of 1.428 g•L^-1, and the initial pH of 5.60. Under the above conditions, the removal efficiency of RhB could reach 97.8%, and the mineralization efficiency could achieve 9.738% after 30 min of reaction.