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6CCVD Research

On the electrooxidation of kraft black liquor on boron-doped diamond

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2022-02-17
JournalJournal of Electroanalytical Chemistry
AuthorsRaisa Costa Paes Oliveira, Josephus G. Buijnsters, Maria Margarida Mateus, JoĂŁo C. Bordado, Diogo M.F. Santos
InstitutionsUniversity of Lisbon, Delft University of Technology
Citations8

Abstract

Section titled “Abstract”

<p>Black liquor (BL) is a highly alkaline byproduct from pulp mills. BL is rich in inorganic and organic compounds, with lignin (a natural polymer) being the most abundant. Following a waste biorefinery concept, the electrolysis of BL comprises lignin oxidation at the anode and hydrogen evolution at the cathode. These paired electrochemical processes show the promise to be carried out at lower cell voltage than that used in conventional alkaline water electrolyzers. Presently, new materials are required to improve the kinetics of the anodic reaction in the BL electrolyzer. Boron-doped diamond (BDD) can oxidize organic compounds at low overpotentials, making it a potential electrode material for BL oxidation. Herein, a BDD/Si electrode was produced, characterized by Raman spectroscopy and SEM, and employed for the oxidation of BL. The properties of the used kraft BL were determined, namely the pH (12.7), conductivity (470 mS cm<sup>−1</sup>), organic/inorganic ratio (1.0), and Klason lignin content (42.2 g L<sup>-1</sup>). Fourier-transform infrared spectroscopy was also used in the BL characterization. The BDD performance for BL oxidation was assessed by cyclic voltammetry, chronopotentiometry, and chronoamperometry. A number of exchanged electrons and a charge transfer coefficient of 3.0 and 0.8, respectively, were calculated. It was demonstrated that BDD presents a good activity for BL oxidation, comparable to that of platinum.</p>

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
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  2. 2019 - Environmental applications of boron-doped diamond electrodes: 1
  3. 2019 - Use of boron-doped diamond electrodes in electro-organic synthesis [Crossref]
  4. 1996 - Electrochemical behavior of boron-doped diamond electrodes [Crossref]
  5. 2019 - Recent developments and advances in boron-doped diamond electrodes for electrochemical oxidation of organic pollutants [Crossref]
  6. 2004 - The water decomposition reactions on boron-doped diamond electrodes [Crossref]
  7. 2009 - Direct and mediated anodic oxidation of organic pollutants [Crossref]
  8. 2003 - Electrochemical incineration of organic pollutants on boron-doped diamond electrode. Evidence for direct electrochemical oxidation pathway [Crossref]
  9. 2009 - Hydroxyl radicals electrochemically generated in situ on a boron-doped diamond electrode [Crossref]
  10. 2014 - Complete mineralization of the antibiotic amoxicillin by electro-Fenton with a BDD anode [Crossref]

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