碳氮掺杂 Mn₃O₄ 催化臭氧氧化降解水中 2,3-二甲基吡嗪

A CN-supported Mn₃O₄ (Mn₃O₄-CN) composite was synthesized as a catalyst for the catalytic ozonation of 2,3-dimethylpyrazine degradation in wastewater. The catalytic efficiencies of 2, 3-dimethylpyrazine were investigated under various ozone dosages, catalyst dosages, pH and temperature conditions. The results showed that under the conditions of an ozone dosage of 3mg/L, a catalyst dosage of 0.02g/L, pH =7 and a temperature of 10°C, the degradation rate of pollutants reached 100% within 20 min. Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and other characterization methods were used to analyze the properties of the prepared Mn₃O₄-CN. It was confirmed that Mn₃O₄ and CN were successfully bonded, and the valence states of Mn were mostly +2 and +3. The reactive oxygen species analysis demonstrated that the surface hydroxyl groups and oxygen vacancies were identified as the main active sites, and .OH was the main active oxygen species generated in the reaction system. The cyclic experiments showed that the Mn₃O₄-CN has good stability and reusability.