Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol
Nawaz, Faheem1,2; Cao, Hongbin1; Xie, Yongbing1; Xiao, Jiadong1,2; Chen, Yue1; Ghazi, Zahid Ali2
2017-02-01
发表期刊CHEMOSPHERE
ISSN0045-6535
卷号168页码:1457-1466
摘要Catalytic ozonation is a highly effective method in wastewater treatment, and MnO2 materials are widely recognized as active heterogeneous catalysts in this process. Many works reported the progress in active MnO2 synthesis, but the active phase is rarely systematically studied. In this paper, all six phases of MnO2 (alpha-, beta-, delta-, gamma-, lambda- and epsilon-) were synthesized by facile methods. Their catalytic activities in ozonation of 4-nitrophenol (4-NP) were evaluated and correlated with the physicochemical properties obtained from Xray Diffraction (XRD), transmission electron microscopy (TEM), physical adsorption and cyclic voltam-metry (CV) analysis. alpha-MnO2 was found to be the most active catalyst in 4-NP degradation at neutral pH. MnO2 with low average oxidation state (AOS) showed stronger oxidation/reduction peaks in CV characterization, which benefited catalytic decomposition of ozone to generate active species. Superoxide radical was confirmed as the main oxidizing species, along with singlet oxygen and ozone molecule oxidation in bulk solution and little contribution of oxidation on the MnO2 surface. Mn2+ leaching happened during catalytic ozonation, but its catalytic role is negligible. This result may give rise to the preparation of new active MnO2 catalysts. (C) 2016 Elsevier Ltd. All rights reserved.
关键词Mno2 Active Phase 4-nitrophenol Catalytic Ozonation Average Oxidation State
文章类型Article
WOS标题词Science & Technology ; Life Sciences & Biomedicine
DOI10.1016/j.chemosphere.2016.11.138
收录类别SCI
语种英语
关键词[WOS]MANGANESE-DIOXIDE ; HYDROGEN-PEROXIDE ; STRUCTURED MNO2 ; WATER-TREATMENT ; OXIDATION ; PERFORMANCE ; DEGRADATION ; OXIDE ; REMOVAL ; PHENOL
WOS研究方向Environmental Sciences & Ecology
WOS类目Environmental Sciences
项目资助者National Science Fund for Distinguished Young Scholars(51425405) ; National Natural Science Foundation of China(21207133) ; Major Science and Technology Program for Water Pollution Control and Treatment(2015ZX07202-013)
WOS记录号WOS:000400879900066
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/22532
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Div Environm Engn & Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Nawaz, Faheem,Cao, Hongbin,Xie, Yongbing,et al. Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol[J]. CHEMOSPHERE,2017,168:1457-1466.
APA Nawaz, Faheem,Cao, Hongbin,Xie, Yongbing,Xiao, Jiadong,Chen, Yue,&Ghazi, Zahid Ali.(2017).Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol.CHEMOSPHERE,168,1457-1466.
MLA Nawaz, Faheem,et al."Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol".CHEMOSPHERE 168(2017):1457-1466.
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