| 梁一帆,黄远星.改性水钠锰矿型二氧化锰的制备及其催化臭氧氧化性能研究[J].有色金属材料与工程,2025,46(6):24-30. |
| 改性水钠锰矿型二氧化锰的制备及其催化臭氧氧化性能研究 |
| Preparation of modified birnessite-type manganese dioxide and its catalytic performance in ozonation |
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| DOI：10.13258/j.cnki.nmme.20240403001 |
| 中文关键词: 改性水钠锰矿 催化臭氧氧化 氧空位 |
| 英文关键词:modified birnessite catalytic ozone oxidation oxygen vacancies |
| 基金项目:国家自然科学基金资助项目（18ZR1426300） |
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| 摘要点击次数: 667 |
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| 中文摘要: |
| 通过水热法合成水钠锰矿型二氧化锰（Bir-MnO2），经酸处理得到酸改性水钠锰矿（acid-modified birnessite，H-Bir）。采用扫描电子显微镜（scanning electron microscope，SEM）、傅里叶变换红外光谱仪（Fourier transform infrared spectrometer，FTIR）、X 射线衍射仪（X-ray diffractometer，XRD）及 X 射线光电子能谱仪（X-ray photoelectron spectrometer，XPS）对催化剂的表面形貌、晶体结构与组成进行表征。结合表征结果阐明其在催化臭氧氧化中的作用机制：与Bir-MnO2相比，H-Bir具有更低的平均氧化态（average oxidation state, AOS），且在催化臭氧氧化反应过程中可形成三种价态锰离子的循环。氧空位（Vo）、表面羟基及金属氧化还原对是该催化剂的主要活性位点。通过不同体系中草酸降解试验表明，H-Bir具备优异的催化性能。 |
| 英文摘要: |
| Birnessite-type manganese dioxide (Bir-MnO2) was synthesized via a hydrothermal method, and acid-modified birnessite (H-Bir) was obtained through the acid treatment of Bir-MnO2. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were employed to characterize the surface morphology, crystal structure, and chemical composition of the catalyst. These characterization results elucidated the catalyst’s mechanism of action in catalytic ozonation. Compared with Bir-MnO2 H-Bir exhibited a lower average oxidation state (AOS) of manganese. Additionally, during the catalytic ozonation process, a redox cycle involving manganese ions in three valence states was formed. Oxygen vacancies (Vo), surface hydroxyl groups, and metal redox couples were identified as the main active sites of the catalyst. Experiments on oxalic acid degradation in different systems demonstrated that H-Bir possessed excellent catalytic performance. |
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