Magnetically assembled electrodes based on Pt, RuO2-IrO2-TiO2 and Sb-SnO2 for electrochemical oxidation of wastewater featured by fluctuant Cl- concentration
Magnetically assembled electrode (MAE) flexibly attracts magnetic particles (auxiliary electrodes, AEs) on a main electrode (ME) by the magnetic force, where the role of ME is always ignored. In this study, Ti/Pt, Ti/RuO2-IrO2-TiO2 and Ti/Sb-SnO2 were selected as the ME for comparison in treating sy...
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Published in | Journal of hazardous materials Vol. 421; p. 126803 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
05.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Magnetically assembled electrode (MAE) flexibly attracts magnetic particles (auxiliary electrodes, AEs) on a main electrode (ME) by the magnetic force, where the role of ME is always ignored. In this study, Ti/Pt, Ti/RuO2-IrO2-TiO2 and Ti/Sb-SnO2 were selected as the ME for comparison in treating synthetic wastewater (acid red G or phenol) with variable Cl- content. The effects of ME type, loading amount of Fe3O4/Sb-SnO2 AEs, and Cl- concentration were investigated, followed by varied electrochemical characterizations. Results show that AEs played a vital role in electrode activity and selectivity, and MEs also exerted an unignorable influence on the performance of the MAEs. Among the three MEs, Ti/RuO2-IrO2-TiO2 has the best OER/CER ability, activating more extra active sites with same AEs loading amount, leading to higher organics degradation efficiency under chlorine-free condition. However, this MAE is featured by the noticeable accumulation of intermediate products under chlorine-free condition even if 0.3 g·cm−2 of AEs are loaded. All electrodes’ performances were enhanced in the presence of Cl-. With high concentration chloride (0.5 M NaCl), the accumulation of intermediate products was reduced significantly, especially on Ti/RuO2-IrO2-TiO2 based MAE, and no chlorinated compound was identified. Finally, the structure-activity relationships of these MAEs were proposed.
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•A new anode architecture was organized by magnetic force.•Main electrodes with different OER/CER activity were compared.•Magnetic particles could effectively increase the less accessible active sites.•The structure-activity relationships under variable Cl- content were discussed. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2021.126803 |