Oxidative capacitance of sulfate-based boron-doped diamond electrochemical system
Article
Article Title | Oxidative capacitance of sulfate-based boron-doped diamond electrochemical system |
---|---|
ERA Journal ID | 1628 |
Article Category | Article |
Authors | Farhat, Ali (Author), Keller, Jurg (Author), Tait, Stephan (Author) and Radjenovic, Jelena (Author) |
Journal Title | Electrochemistry Communications |
Journal Citation | 89, pp. 14-18 |
Number of Pages | 5 |
Year | 2018 |
Place of Publication | United States |
ISSN | 1388-2481 |
1873-1902 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.elecom.2018.02.007 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1388248118300365?via%3Dihub |
Abstract | This study investigates the sustained oxidation performance of sulfate-based electrooxidation at a boron-doped diamond anode; more specifically, the continued oxidation of a model compound, diatrizoate, in the absence of applied current (i.e., off-grid oxidation). Two approaches were taken: delayed sample quenching with methanol, and application of intermittent current supply. For samples electrooxidized in Na2SO4 anolyte for 10–15 min, a delay of 60 min in sample quenching yielded an additional diatrizoate removal of 53%. This impact of sample quenching delay was observed at both pH 2 and pH 7, indicating that the source of sulfate and hydroxyl radicals was present at both pH values. Intermittent current supply (cycles of 5 min ON/15 min OFF) enabled a saving in electrical energy consumption by ~35% compared to constant current, due to continued removal of diatrizoate during the OFF periods. Electrooxidation in NaNO3 anolyte did not show any off-grid oxidation of diatrizoate, confirming the crucial role of electrochemically activated sulfate. Given that the sulfate concentration was only 150 mg L−1, the results presented herein may have significant implications in the electrochemical treatment of various types of contaminated water, from groundwater to sulfate-rich wastewater. |
Keywords | electrooxidation; sulfate radicals; sustained oxidation performance; radical chain propagation |
ANZSRC Field of Research 2020 | 401102. Environmentally sustainable engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q516y/oxidative-capacitance-of-sulfate-based-boron-doped-diamond-electrochemical-system
152
total views10
total downloads2
views this month0
downloads this month