NDLI: Hierarchical shape-controlled mixed-valence calcium manganites for catalytic ozonation of aqueous phenolic compounds

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Catalysis Science & Technology Vol - 6 Issue - 8

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Hierarchical shape-controlled mixed-valence calcium manganites for catalytic ozonation of aqueous phenolic compounds

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Yuxian Wang, Shaobin Xiao, Jiadong Cao, Hongbin Xie, Yongbing Sun, Hongqi
Copyright Year	2016
Abstract	Catalytic ozonation has attracted intensive attention due to its efficient degradation of various organic pollutants in water. The key to a practical application is the discovery of highly effective catalysts. This study, for the first time, reports excellent performances of porous mixed-valence calcium manganite (CaMn3O6 and CaMn4O8) microspheres made of 1D nanorods in the catalytic ozonation of 4-nitrophenol. The CaMn3O6 and CaMn4O8 showed much higher activities and stabilities than manganese oxides. From a variety of advanced characterizations, the mechanism of surface catalysis was discussed in detail. Quenching reagents and electron paramagnetic resonance (EPR) spectroscopy were applied to probe the dominant reactive species in the catalytic ozonation over the calcium manganites. It was found that superoxide radicals and singlet oxygen rather than hydroxyl radicals contributed to the degradation and mineralization of 4-nitrophenol. Moreover, the effects of electron-withdrawing groups (EWG) and electron-donating groups (EDG) in the phenolic compounds on the ozonation/catalytic ozonation over the calcium manganites were investigated using phenol, p-cresol and p-chlorophenol as target pollutants.
Starting Page	2918
Ending Page	2929
Page Count	12
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	6
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy01967b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Manganite Calcium EPR Ozone Superoxide 4-Nitrophenol Phenol Singlet oxygen EWG P-Cresol Electron paramagnetic resonance Hydroxyl radical Manganese
Content Type	Text
Resource Type	Article
Subject	Catalysis

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