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Remediation of 2,4-dichlorophenol contaminated water by visible light-enhanced WO3 photoelectrocatalysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
46163 46430 2012 7 PDF Available
Title
Remediation of 2,4-dichlorophenol contaminated water by visible light-enhanced WO3 photoelectrocatalysis
Abstract

The application of semiconductor photocatalysis in waste water treatment has been intensively investigated over the past decade. Most studies involve titanium-based photocatalysts; however, practical applications are still limited by their poor visible light activity. As an alternative, a tungsten trioxide-based photoelectrocatalytic fuel cell (PECFC) with a cell configuration based on the proton exchange membrane fuel cell (PEMFC) technology has been employed for pollutant remediation. In this study, the degradation of a persistent chlorophenol (2,4-dichlorophenol) was assessed using a visible light active tungsten trioxide photocatalyst. The degradative progress of the 2,4-DCP was monitored over a period of 24 h by both chemical analysis and a bacterial biosensor (Escherichia coli HB101 pUCD607) toxicity assay. A 74% decrease in concentration of the 2,4-DCP was observed after a period of 24 h, from which ca. 54% were accountable to degradation processes and 20% due to pollutant losses by adsorption or volatilisation. The biosensor toxicity response correlated well with the observed concentration reduction of 2,4-DCP, but also indicated the formation of more toxic intermediates. HPLC–MS analysis was carried out to study intermediate degradation products. There were indications of the occurrence of stable dimers within the first few hours of the degradation process and the formation of intermediate degradation products of higher bacterial toxicity than the parent compound. Although the potential of the PECFC, as a sustainable method for water treatment, has been demonstrated, further work is required to optimise this new technology for mineralisation of organic contaminants.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Degradation of 2,4-DCP was investigated using a WO3 photoelectrocatalytic fuel cell. ▸ The WO3 photoelectrocatalyst was active in the presence of visible light. ▸ The application of an external bias enhanced the degradation rate of the cell. ▸ Degradative progress was assessed by chemical and biosensor toxicity analyses. ▸ WO3 is potentially an alternative photocatalyst for treatment of contaminated water.

Keywords
Tungsten trioxide; 2,4-Dichlorophenol; Photoelectrocatalysis; Waste water; Bacterial biosensor
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Remediation of 2,4-dichlorophenol contaminated water by visible light-enhanced WO3 photoelectrocatalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 433–439
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