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Catalytic ozonation of 4-nitrophenol over an mesoporous α-MnO2 with resistance to leaching

Paper ID Volume ID Publish Year Pages File Format Full-Text
53637 46977 2015 7 PDF Available
Title
Catalytic ozonation of 4-nitrophenol over an mesoporous α-MnO2 with resistance to leaching
Abstract

•α-MnO2 is obtained from reduction of KMnO4 with assistance of surfactant.•CTAB works both as a morphology directing agent and reduction initiator.•α-MnO2 with high surface area is active in catalytic ozonation of 4-nirtrophenol.•α-MnO2 is more stable and resistant to leaching than the commercial one.•4-Nitrophenol is mainly oxidized by superoxide radicals, not hydroxyl radicals.

Two series of α-MnO2 materials were prepared via a similar method with surfactant cetyltrimethylammonium bromide (CTAB) and sodium dodecyl benzene sulfate (SDBS). The surfactants work both as shape directing agent and reduction initiator. The α-MnO2 synthesized with 0.2 M of CTAB showed a mesoporous structure with high surface area of 387.7 m2/g. It is very active in catalytic ozonation of 4-nitrophenol (4-NP) and total organic carbon removal, with higher catalytic stability than commercial MnO2. Using tert-butanol and p-benzoquinone as scavengers of different oxidative species, we found that superoxide radicals, rather than hydroxyl radicals, were mainly responsible for the degradation of 4-NP.

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Keywords
Surfactants; Manganese dioxide; 4-Nitrophenol; Catalytic ozonation
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Catalytic ozonation of 4-nitrophenol over an mesoporous α-MnO2 with resistance to leaching
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 2, 1 December 2015, Pages 595–601
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us