期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 279, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119366
关键词
Boron-doped diamond; Electrooxidation; Electron paramagnetic resonance spectrometry; Radical and non-radical oxidants; Oil sands process water
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) Senior Industrial Research Chair (IRC) in Oil Sands Tailings Water Treatment
- Canada First Research Excellence Fund
- Suncor Energy Inc.
- Syncrude Canada Ltd.
- Imperial Oil Resources
- Teck Resources Limited
- Canadian Natural Resources Ltd.
- EPCOR Water Services
- Alberta Innovates
- Alberta Environment and Parks
Radical and non-radical oxidants identification and transformation mechanisms in electrooxidation using boron doped diamond electrode (EO-BDD) have been limited to synthetic solutions with little attention given to real complex matrix. In this study, electron paramagnetic resonance spectrometry (EPR) and spectrophotometry were used to identify/quantify the radical and non-radical oxidants generated during the EO treatment of oil sands process water (OSPW). The EPR spectra confirmed the direct electrogeneration of BDD((OH)-O-center dot), SO4 center dot- and CO3 center dot- as radical oxidants from H2O, SO42- and CO32- oxidation, respectively, in both OSPW and ultra-pure water containing either SO42- or CO32-. There was also accumulation of S2O82-, C2O62- and active chlorine as non-radical oxidants from the oxidation of SO42-, CO32- and Cl-, respectively. The degradation of organic contents of the OSPW was by both radical and non-radical oxidation pathways, achieving complete degradation and mineralization of dissolved organic contents at current density >= 5 mA cm(-)(2).
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