Abstract
The boron-doped diamond electrode has been widely applied in electrochemical process for wastewater treatment based on the generation of hydroxyl radicals (•OH). This study investigated the formation efficiency of 2-HTA through the interaction between •OH radical and terephthalic acid (TA) to monitor the •OH formation. Results show that the 2-HTA formation efficiency did not depend on the initial concentration of scavenger (here, TA) in the investigated range of 0.1 to 1 mM TA. Meanwhile, other factors, such as current density, supporting electrolyte, sodium hydroxide have a significant influence. The optimal condition was established: concentration of electrolyte (0.05 M Na2SO4); initial concentration of TA (0.1 mM); concentration of NaOH (1 mM); current density (j = 20 mA cm–2). The selectivity of TA was evaluated by Faradaic efficiency (η) and hydroxylation yield (\({{{{\gamma }}}_{{{\text{TAOH}}}}}\)), indicating that Faradaic efficiency (η) for 2-HTA formation was in the range of 10–5–10–7, while the hydroxylation yield of •OH (\({{{{\gamma }}}_{{{\text{TAOH}}}}}\)) into 2-HTA was 0.03–0.12.
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ACKNOWLEDGMENTS
Partial data in this paper were extracted from the doctoral thesis entitled “Padan 95 SP treatment by electrochemical process and its combination with other techniques” completed by the author (Mr. Nguyen Tien Hoang) for the Degree of Doctor of Philosophy at the Technische Universität Chemnitz, Germany [46].
We wish to express our thanks to Professor Rudolf Holze (Chemnitz University of Technology) for his supervision, Professor M. Sommer and Dr. E. Dietzsch (Chemnitz University of Technology) for experimental support and helpful discussions.
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Nguyen Tien Hoang: Writing—original draft, Conceptualization, Methodology, Writing—review & editing, Supervision. Fredrick M. Mwazighe: Writing—review & editing.
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Nguyen Tien Hoang, Fredrick M. Mwazighe Effect of Operating Conditions on the Yield of 2-Hydroxyterephthalic Acid for Tracing •OH Radical in Electrochemical Process. Moscow Univ. Chem. Bull. 77, 286–299 (2022). https://doi.org/10.3103/S002713142205008X
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DOI: https://doi.org/10.3103/S002713142205008X