Role of nitrite ligands in enhancing sulfate radical production via catalytic peroxymonosulfate activation by cobalt complexes
- Authors
- Choi, Jaemin; Kim, Hyoung-il; Lee, Jaesang; Lee, Hongshin
- Issue Date
- 15-12월-2021
- Publisher
- ELSEVIER
- Keywords
- Cobalt complexation; Enhanced recyclability; High-valent cobalt; Peroxymonosulfate activation; Sulfate radical
- Citation
- SEPARATION AND PURIFICATION TECHNOLOGY, v.279
- Indexed
- SCIE
SCOPUS
- Journal Title
- SEPARATION AND PURIFICATION TECHNOLOGY
- Volume
- 279
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135406
- DOI
- 10.1016/j.seppur.2021.119698
- ISSN
- 1383-5866
- Abstract
- In this study, hexanitrocobaltate (HN-Co(III)) was compared against Co2+ with respect to the capability for peroxymonosulfate (PMS) activation. The role of NO2- ligands in enhancing Co(II)/Co(III) cycling was confirmed based on the two-fold increase in the benzoic acid (BA) degradation efficiency of HN-Co(III)/PMS vs. Co2+/PMS and the negligible reduction in the activation performance of HN-Co(III) over repeated use. This was in line with accelerated BA degradation and catalytic activity recovery upon NO2- addition to Co2+/PMS. A negative shift in the anodic peak potential of the Co(II)/Co(III) couple and an increase in the anodic current over time imply that NO2- coordination promoted the capacity of Co(II) for PMS activation and facilitated the Co(III)-to-Co(II) conversion through hydrolysis. Along with sulfate radical as the primary oxidant, high-valent cobalt acted as the non-radical secondary oxidant based on the transformation of phenyl methyl sulfoxide to the corresponding sulfone in the HN-Co(III)/PMS mixtures.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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