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6CCVD Research

A comparison between flow-through cathode and mixed tank cells for the electro-Fenton process with conductive diamond anode

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2019-09-13
JournalChemosphere
AuthorsInmaculada Moraleda, Nihal Oturan, Cristina SĂĄez, Javier Llanos, Manuel A. Rodrigo
InstitutionsUniversité Paris Cité, University of Castilla-La Mancha
Citations23

Abstract

Section titled “Abstract”

This work focusses on the production of hydrogen peroxide and in the removal of bromacil by the electro-Fenton process using two different electrochemical cells: mixed tank cell (MTC) and flow-through cell (FTC). Both cells use boron doped diamond (BDD) as anode and carbon felt as cathode to promote the formation of hydrogen peroxide. In the case of the MTC, two surface area ratios, A<sub>cathode</sub>/A<sub>anode</sub>, have been used. Results show that the H<sub>2</sub>O<sub>2</sub> produced by MTC and FTCPSC increases with the time until a stabilization state. For the FTCPSC, the average hydrogen peroxide concentration produced increases progressively with the current, while for MTC the maximum values are found in applying very low current densities. In addition, the FTCPSC provides higher concentrations of hydrogen peroxide for the same current density applied. Regarding the MTC, it can be stated that the higher the area of the cathode, the higher is the amount of H<sub>2</sub>O<sub>2</sub> produced and the lower is the cell voltage (because of a more efficient current lines distribution). The initial oxidation of bromacil is very efficiently attained being rapidly depleted from wastewater. However, the higher production of hydrogen peroxide obtained by the FTCPSC cell does not reflect on a better performance of the electro-Fenton process. Thus, bromacil is better mineralized using the MTC cell with the lowest cathode area. This observation has been explained because larger concentrations of produced hydrogen peroxide seems to benefit the oxidation of intermediates and not the mineralization.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2013 - Anodic oxidation, electro-Fenton and photoelectro-Fenton degradation of cyanazine using a boron-doped diamond anode and an oxygen-diffusion cathode [Crossref]
  2. 2014 - Electro-fenton, UVA photoelectro-Fenton and solar photoelectro-Fenton treatments of organics in waters using a boron-doped diamond anode: a review
  3. 2009 - Electro-fenton process and related electrochemical technologies based on Fenton’s reaction chemistry [Crossref]
  4. 2007 - Effect of the operating conditions on the oxidation mechanisms in conductive-diamond electrolyses [Crossref]
  5. 2007 - Removal of methyl parathion from water by electrochemically generated Fenton’s reagent [Crossref]
  6. 2012 - Design of a visible light driven photo-electrochemical/electro-Fenton coupling oxidation system for wastewater treatment [Crossref]
  7. 1943 - Colorimetric determination of hydrogen peroxide
  8. 2010 - Prediction of oxygen solubility in pure water and brines up to high temperatures and pressures [Crossref]
  9. 2013 - On-site hydrogen peroxide production at pilot flow plant: application to electro-Fenton process [Crossref]
  10. 2018 - Optimization of a cell for the electrochemical synergistic production of peroxoacetic acid [Crossref]

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