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Wet oxidation of phenol, cresols and nitrophenols catalyzed by activated carbon in acid and basic media

Paper ID Volume ID Publish Year Pages File Format Full-Text
49172 46561 2006 13 PDF Available
Title
Wet oxidation of phenol, cresols and nitrophenols catalyzed by activated carbon in acid and basic media
Abstract

A commercial activated carbon, Industrial React FE01606A, was used as catalyst in the wet oxidation, in both acid and basic media, of phenolic pollutants, such as phenol, cresols and nitrophenols, currently found in industrial wastewaters. Reaction runs were carried out in a fixed-bed reactor (FBR) with concurrent upflow by feeding a 1000 mg L−1 aqueous solution on each pollutant concurrently with a gas oxygen flow. Temperature and oxygen pressure of the reactor were set to 160 °C and 16 bar, respectively. The basic medium was maintained by using 500 ppm sodium bicarbonate as buffer reagent to keep the pH in the range 7–8. The initial pH 3.5 was set by adding sulphuric acid. Oxidation intermediates were identified and their distribution with respect to the pollutant oxidation progress was measured. Utilizing these results, oxidation routes for each phenolic compound were deduced. The intermediates produced were diverse in acid and basic media and their composition explains the evolution of the corresponding toxicity measured at the reactor effluent. While under acidic conditions hydroxybenzoic acids, dihydroxyl benzenes and quinones were obtained as primary products, these last two compounds (more toxic than the original pollutant) were not detected in basic conditions, and with such media lower toxicities at the reactor exit were obtained. Moreover, the catalyst was found to be stable in the time range studied (300 h).

Keywords
Catalytic wet oxidation; Activated carbon; Substituted phenols; pH; Toxicity
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Wet oxidation of phenol, cresols and nitrophenols catalyzed by activated carbon in acid and basic media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 65, Issues 3–4, 6 June 2006, Pages 269–281
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