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Aqueous Iron(IV)–Oxo Complex: An Emerging Powerful Reactive Oxidant Formed by Iron(II)-Based Advanced Oxidation Processes for Oxidative Water Treatment
Abstract
High-valent iron(IV)–oxo complexes are of great significance as reactive intermediates implicated in diverse chemical and biological systems. The aqueous iron(IV)–oxo complex (Fe aq IV O 2+ ) is the simplest but one of the most powerful ferryl ion species, which possesses a high-spin state, high reduction potential, and long lifetime. It has been well documented that Fe aq IV O 2+ reacts with organic compounds through various pathways (hydrogen-atom, hydride, oxygen-atom, and electron transfer as well as electrophilic addition) at moderate reaction rates and show selective reactivity toward inorganic ions prevailing in natural water, which single out Fe aq IV O 2+ as a superior candidate for oxidative water treatment. This review provides state-of-the-art knowledge on the chemical properties and oxidation mechanism and kinetics of Fe aq IV O 2+, with special attention to the similarities and differences to two representative free radicals (hydroxyl radical and sulfate radical). Moreover, the prospective role of Fe aq IV O 2+ in Fe aq 2+ activation-initiated advanced oxidation processes (AOPs) has been intensively investigated over the past 20 years, which has significantly challenged the conventional recognition that free radicals dominated in these AOPs. The latest progress in identifying the contribution of Fe aq IV O 2+ in Fe aq 2+ -based AOPs is thereby reviewed, highlighting controversies on the nature of the reactive oxidants formed in several Fe aq 2+ activated peroxide and oxyacid processes. Finally, future perspectives for advancing the evaluation of Fe aq IV O 2+ reactivity from an engineering viewpoint are proposed.
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Self-citation
Metadata
- Authors
- Wang, Z., Qiu, W., Pang, S.-Y., Guo, Q., Guan, C., & Jiang, J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-01-10
- Volume
- 56
- Issue
- 3
- Pages
- 1492-1509
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W4206358639
- Cited by
- 386
- References
- 102
- FWCI
- 21.75
- Type
- journal article
- Language
- en
- Open access
- closed
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