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Removal of herbicide glyphosate by conductive-diamond electrochemical oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45023 46393 2016 8 PDF Available
Title
Removal of herbicide glyphosate by conductive-diamond electrochemical oxidation
Abstract

•Glyphosate can be removed from wastewater by electrolysis with diamond anodes.•PO43−, NO3− and CO2 are the main final products of the oxidation of glyphosate.•Oxidants electrogenerated have an important effect on glyphosate degradation.•A complete mineralization of organic matter is obtained at 100 mA cm−2 in Cl media.

This work focuses on the removal of herbicide glyphosate by electrolysis with boron doped diamond anodes. Both the electrolysis of the pure reagent and that of a commercial dispersion (RoundUp) are evaluated. Results show that it is possible to attain a complete mineralization of this herbicide and point out the key role of the supporting electrolyte in the efficiency of the process. This role is explained in terms of the electrogeneration of oxidants. The electrolysis of glyphosate also leads to the release of phosphate and nitrate anions. Further electrochemical and chemical reactivity explains the occurrence of ammonium and other nitrogen species in the electrolyte during the process. Regarding the influence of the type of herbicide (chemical or commercial), competitive reactions have been observed between the electrolysis of herbicide and surfactant, which help to explain the lower efficiency observed in the degradation of RoundUp. Regarding the influence of the operation current density, the process is found to be more efficient at low current densities but at these conditions it is not possible to attain the complete mineralization of pollutant.

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Keywords
Diamond anode; Electrolysis; Herbicide; Glyphosate
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Removal of herbicide glyphosate by conductive-diamond electrochemical oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 188, 5 July 2016, Pages 305–312
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