Farhat, Ali and Keller, Jurg and Tait, Stephan and Radjenovic, Jelena (2018) Oxidative capacitance of sulfate-based boron-doped diamond electrochemical system. Electrochemistry Communications, 89. pp. 14-18. ISSN 1388-2481
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.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Files associated with this item cannot be displayed due to copyright restrictions. |
| Faculty / Department / School: | Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences |
| Date Deposited: | 18 Feb 2019 04:43 |
| Last Modified: | 19 Feb 2019 01:31 |
| Uncontrolled Keywords: | electrooxidation; sulfate radicals; sustained oxidation performance; radical chain propagation |
| Fields of Research : | 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies |
| Identification Number or DOI: | doi.org/10.1016/j.elecom.2018.02.007 |
| URI: | http://eprints.usq.edu.au/id/eprint/35762 |
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