Degradation Performance of 4-Chlorophenol as a Typical Organic Pollutant by a Pulsed High Voltage Discharge System
Degradation of aqueous 4-chlorophenol (4-CP) with air bubbling was experimentally investigated in a multipoint-plate pulsed high voltage reactor. Several important parameters, including electrode distance, liquid conductivity, gas flow rate, and initial concentration, were investigated for 4-CP remo...
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Published in | Industrial & engineering chemistry research Vol. 46; no. 17; pp. 5469 - 5477 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
15.08.2007
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Subjects | |
Online Access | Get full text |
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Summary: | Degradation of aqueous 4-chlorophenol (4-CP) with air bubbling was experimentally investigated in a multipoint-plate pulsed high voltage reactor. Several important parameters, including electrode distance, liquid conductivity, gas flow rate, and initial concentration, were investigated for 4-CP removal and energy efficiency. After discharge for 90 min, more than 95% of 4-CP was removed at the electrode distance of 1.5 cm, liquid conductivity of 1.06 μS/cm, gas flow rate of 0.75 m3/h, and initial concentration of 60 ppm with specific energy density of 450 J/mL. The energy efficiency of 4-CP was about 2.15 × 10-9 mol/J, and the mineralization of total organic carbon (TOC) reached to 55.8%. Hydrogen peroxide, ozone, nitrite, and nitrate were observed in the liquid phase. 4-chlorocatechol, hydroquinone, 5-chloro-3-nitropyrocatechol, chloride ion, formic, and acetic and oxalic acids were the main byproducts during 4-CP degradation. The degradation pathways were deduced including hydroxylation, N atom attack, and oxygen/ozone oxidation. A kinetic model was established to predict the degradation pathway, and the experimental data were fitted to the developed mathematical model well. |
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Bibliography: | ark:/67375/TPS-HCLJKBV3-T istex:BC7885038586617ECEC6D67ECE2C007280783D51 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0888-5885 1520-5045 |
DOI: | 10.1021/ie070186b |