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Enhanced Oxidation of Organic Contaminants by Iron(II)-Activated Periodate: The Significance of High-Valent Iron–Oxo Species
Abstract
Potassium periodate (PI, KIO 4 ) was readily activated by Fe(II) under acidic conditions, resulting in the enhanced abatement of organic contaminants in 2 min, with the decay ratios of the selected pollutants even outnumbered those in the Fe(II)/peroxymonosulfate and Fe(II)/peroxydisulfate processes under identical conditions. Both 18 O isotope labeling techniques using methyl phenyl sulfoxide (PMSO) as the substrate and X-ray absorption near-edge structure spectroscopy provided conclusive evidences for the generation of high-valent iron–oxo species (Fe(IV)) in the Fe(II)/PI process. Density functional theory calculations determined that the reaction of Fe(II) with PI followed the formation of a hydrogen bonding complex between Fe(H 2 O) 6 2+ and IO 4 (H 2 O) −, ligand exchange, and oxygen atom transfer, consequently generating Fe(IV) species. More interestingly, the unexpected detection of 18 O-labeled hydroxylated PMSO not only favored the simultaneous generation of · OH but also demonstrated that · OH was indirectly produced through the self-decay of Fe(IV) to form H 2 O 2 and the subsequent Fenton reaction. In addition, IO 4 – was not transformed into the undesired iodine species (i.e., HOI, I 2, and I 3 – ) but was converted to nontoxic iodate (IO 3 – ). This study proposed an efficient and environmental friendly process for the rapid removal of emerging contaminants and enriched the understandings on the evolution mechanism of · OH in Fe(IV)-mediated processes.
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Metadata
- Authors
- Zong, Y., Shao, Y., Zeng, Y., Shao, B., Xu, L., Zhao, Z., Liu, W., & Wu, D.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-03-12
- Volume
- 55
- Issue
- 11
- Pages
- 7634-7642
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W3134869145
- Cited by
- 499
- References
- 55
- FWCI
- 21.39
- Type
- journal article
- Language
- en
- Open access
- closed
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