碳氮掺杂Mn<sub>3</sub>O<sub>4</sub>催化臭氧氧化降解水中2,3-二甲基吡嗪

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摘要合成了碳氮负载Mn₃O₄(Mn₃O₄-CN)复合材料作为臭氧催化剂用于降解废水中的2,3-二甲基吡嗪,考察了不同臭氧投量催化剂投量、pH值与温度下催化臭氧氧化水中2,3-二甲基吡嗪的效果.结果表明,在臭氧投量为3mg/L,催化剂投量为0.02g/L,pH =7,温度为10℃的条件下,20min内污染物的降解率达到100%.采用扫描电镜,X射线光电子能谱,X射线衍射等手段对材料进行表征分析,证实Mn₃O₄-CN中Mn₃O₄与CN发生键合,Mn价态为+2价与+3价的混合,证明Mn₃O₄-CN表面羟基基团与氧空位是主要活性位点,^•OH是主要活性氧物种;循环实验表明Mn₃O₄-CN具有良好的稳定性与重复利用性.

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	陈怡
	何银宁
	汪达
	宋爽
	马军

关键词 ：臭氧催化氧化, 吡嗪, 水处理, 锰氧化物

Abstract：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℃, 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.

Key words： catalytic ozonation pyrazines water treatment manganese oxide

收稿日期: 2024-08-09

PACS:

X703.5

基金资助:浙江省自然科学基金重点项目(LZ24B070002);浙江省大学生科技创新活动计划暨新苗人才计划(2023R403016)

作者简介: 陈怡(2002-),女,浙江绍兴人,浙江工业大学硕士研究生,主要从事水污染控制研究.19858110385@163.com.

引用本文:

陈怡, 何银宁, 汪达, 宋爽, 马军. 碳氮掺杂Mn₃O₄催化臭氧氧化降解水中2,3-二甲基吡嗪[J]. 中国环境科学, 2025, 45(3): 1251-1259. CHEN Yi, HE Yin-ning, WANG Da, SONG Shuang, MA Jun. Catalytic ozonation of 2,3-dimethylpyrazine using CN-doped Mn₃O₄. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1251-1259.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I3/1251

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