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6CCVD Research

Testing the role of electrode materials on the electro-Fenton and photoelectro-Fenton degradation of clopyralid

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2020-05-29
JournalJournal of Electroanalytical Chemistry
AuthorsGĂ©ssica de Oliveira Santiago Santos, Katlin Ivon Barrios Eguiluz, Giancarlo R. Salazar‐Banda, Cristina SĂĄez, Manuel A. Rodrigo
InstitutionsUniversidade Tiradentes, Instituto de Tecnologia e Pesquisa
Citations37

Abstract

Section titled “Abstract”

This work studies the effect of the anode and cathode materials on the degradation of the herbicide clopyralid. Different electrochemical advanced oxidation processes (EAOPs), including electrochemical oxidation with electrogenerated hydrogen peroxide (EO-H2O2), electro-Fenton (EF), and photoelectro-Fenton (PEF) were carried out. The first experiments were focused on the effect of the cathode, where the use of the hydrophobic carbon felt modified by the deposition of carbon black & PTFE mixture (MCF) improves the H2O2 production in comparison to a conventional carbon felt (CF), regardless of the anode material employed. On the other hand, a laser-made Ti/Ru0.3Ti0.7O2 mixed metal oxide (MMO) and a commercial boron-doped diamond (BDD) were compared as anodes. Results obtained point out that the MMO anode promotes the accumulation of this oxidant (H2O2) in bulk. Once characterized by the production of hydrogen peroxide, the second part of this study focused on the degradation of clopyralid with the MCF cathode with different EAOPs. Results demonstrate that clopyralid fastly degrades in the sequence EO-H2O2 < EF < PEF, and almost complete mineralization occurs for EF and PEF employing MMO or BDD as the anode. Synergy effect study shows that irradiation of 9 W UVC produces a positive synergistic effect of 81.7% and 41.55% (for the PEF-MMO and PEF-BDD, respectively), ascribed to the additional removal of aromatic intermediates by the UVC and the activation of H2O2. At the end of the treatment, mineralization of the herbicide was attained at 1.22 kW h (g−1 TOC). Finally, considering the lower cost of the prepared MMO, these findings demonstrate the potentiality of using modified carbon felt combined with the laser-made Ti/Ru0.3Ti0.7O2 anode for the treatment of polluted waters.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2014 - Electrochemically assisted remediation of pesticides in soils and water: a review [Crossref]
  2. 2009 - Photodegradation of clopyralid in TiO2 suspensions: identification of intermediates and reaction pathways [Crossref]
  3. 2018 - Toward the development of efficient electro-Fenton reactors for soil washing wastes through microfluidic cells [Crossref]
  4. 2019 - Enhanced electrolytic treatment for the removal of clopyralid and lindane [Crossref]
  5. 2019 - Radiation-assisted electrochemical processes in semi-pilot scale for the removal of clopyralid from soil washing wastes [Crossref]
  6. 2020 - Improving biodegradability of clopyralid wastes by photoelectrolysis: the role of the anode material [Crossref]
  7. 2017 - New perspectives for advanced oxidation processes [Crossref]
  8. 2017 - Electrochemical advanced oxidation processes: a review on their application to synthetic and real wastewaters [Crossref]

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