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Coupling of electrochemical and photocatalytic technologies for accelerating degradation of organic pollutants

Paper ID Volume ID Publish Year Pages File Format Full-Text
26346 43948 2016 8 PDF Available
Title
Coupling of electrochemical and photocatalytic technologies for accelerating degradation of organic pollutants
Abstract

•Coupling of electrochemical reduction with photocatalysis.•Much shorter time to mineralization by first treating pollutant electrochemically.•Acid orange 7 was used as model azo-dye.•The presence of NaCl was proven crucial contrary to Na2SO4, which was ineffective.

Acid orange 7 has been degraded in the presence of NaCl by coupling electrochemical treatment with purely photocatalytic degradation. First, electrochemical reduction broke the azo bond and the obtained fragments were then subjected to photocatalytic degradation. The coupling of the two processes accelerated the mineralization process. Electrochemical treatment was carried out at a moderate potential of −1 V vs Ag/AgCl and it was much faster in the presence of NaCl than in Na2SO4. The effects of salt and substrate concentrations were also studied. The degradation route was monitored by LC-MS and ion chromatography analysis. The transformation products at initial stages were 4-aminobenzene sulfonic acid and 1,4-naphthoquinone while at the end the nitrogen of the azo bond was fully mineralized to inorganic ions.

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Keywords
Photocatalysis; Photoelectrocatalysis; Electrochemical reduction; TiO2 films; Acid orange 7
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Coupling of electrochemical and photocatalytic technologies for accelerating degradation of organic pollutants
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 317, 15 February 2016, Pages 100–107
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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
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