可见光驱动下氧掺杂氮化碳活化过硫酸盐降解罗丹明B

采用双氧水溶剂热处理法处理石墨相氮化碳（g-C₃N₄）合成氧掺杂石墨相氮化碳（O-g-C₃N₄），并通过SEM、XRD、XPS、UV-visDRS等技术手段对O-g-C₃N₄进行表征.结果表明，O-g-C₃N₄表面光滑度降低，纳米片层呈现阶梯状形貌，可见光吸收性能和催化性能有了明显提高.同时，该改性方法能够有效地通过取代sp²杂化N原子的方式将O原子掺杂到g-C₃N₄中.以波长为430 nm的LED灯作为可见光光源，将O-g-C₃N₄用于活化过硫酸盐降解罗丹明B（RhB）.结果表明，该实验体系能够大幅度提高RhB的去除率.当所加LED灯的电源功率为18.00 W，O-g-C₃N₄投加量为0.08 g·L^-1，PS投加量为1.428 g·L^-1，溶液初始pH为5.6时，反应30 min后，浓度为10 mg·L^-1的RhB的降解率可以达到97.8%，矿化率可达9.738%.

Degradation of Rhodamine B by persulfate activated by oxygen-doped carbon nitride under visible light irradation

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.