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Influence of the morphology and the surface chemistry of carbons on their catalytic performances in the catalytic wet peroxide oxidation of organic contaminants

Paper ID Volume ID Publish Year Pages File Format Full-Text
41786 45900 2010 12 PDF Available
Title
Influence of the morphology and the surface chemistry of carbons on their catalytic performances in the catalytic wet peroxide oxidation of organic contaminants
Abstract

The catalytic behavior of five different carbon materials (mesoporous graphite-like carbon Sibunit, catalytic filamentous carbon (CFC), nano-diamonds (ND) and onion-like carbon (OLC)) in the catalytic wet peroxide oxidation of model organic compounds with different sorption capacities and stability towards oxidation (phenol, ethanol and formic acid) has been examined, in the absence and in the presence of Fe3+ ions. All the bare carbons showed extremely low catalytic activity in the oxidation of phenol, ethanol and formic acid in the absence of iron. The homogeneous Fe-catalyzed oxidation of all substrates was much faster. Furthermore, in the Fe-promoted catalytic oxidation over carbons, the presence of ND inhibited the oxidation of the model substrates compared to the homogeneous Fe3+-catalyzed oxidation. On the contrary, the other carbon samples (OLC, CFC, Sibunit) accelerated the oxidation of ethanol and formic acid under the same reaction conditions. More complex effects were observed for OLC, СFС and Sibunit in the oxidation of phenol. A tentative mechanism is discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (153 K)Download as PowerPoint slideResearch highlights▶ Catalytic behavior of different carbons in the CWPO was examined in the absence/presence of Fe3+ ions. ▶ Catalytic activity of the carbons alone is poor in comparison to Fenton-like system. ▶ The presence of nano-diamonds decreased the oxidation rate in the presence of Fe3+. ▶ The sp2-hybridized carbons/Fe3+ accelerate CWPO in comparison to Fenton-like system.

Keywords
Carbon; Hydrogen peroxide; Oxidation; CWPO; Wastewater treatment; Phenol; Ethanol; Formic acid
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Influence of the morphology and the surface chemistry of carbons on their catalytic performances in the catalytic wet peroxide oxidation of organic contaminants
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 387, Issues 1–2, 20 October 2010, Pages 55–66
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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