Effect of Operating Conditions on the Yield of 2-Hydroxyterephthalic Acid for Tracing •OH Radical in Electrochemical Process
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2022-09-06 |
| Journal | Moscow University Chemistry Bulletin |
| Authors | Nguyen Tien Hoang, Fredrick M. Mwazighe |
| Institutions | University of Nairobi, University of Da Nang |
| Citations | 2 |
Abstract
Section titled “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.