有色金属材料与工程2025，Vol.46Issue(6)：24-30,7.DOI:10.13258/j.cnki.nmme.20240403001
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
摘要
Abstract
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.关键词
改性水钠锰矿/催化臭氧氧化/氧空位Key words
modified birnessite/catalytic ozone oxidation/oxygen vacancies分类
资源环境引用本文复制引用
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):24-30,7.基金项目
国家自然科学基金资助项目(18ZR1426300) （18ZR1426300）
