New Evidence against Hydroxyl Radicals as Reactive Intermediates in the Thermal and Photochemically Enhanced Fenton Reactions
Abstract
During the oxidative degradation of 2,4-dimethylaniline (2,4-xylidine) by means of the H 2 O 2 /UV method, a series of hydroxylated aromatic amines are formed, this result confirming the role of the hydroxyl radical as an initiator of the oxidative chain reaction. Thermal or photochemically enhanced Fenton reactions in the presence of 2,4-dimethylaniline (2,4-xylidine) yield primarily 2,4-dimethylphenol as an intermediate product, the genesis of which may only be explained by an electron transfer mechanism. Experimental evidence for such a mechanism is presented, and values for the quantum yields of the photochemically enhanced reduction of iron(III) to iron(II) in aqueous solutions of 2,4-xylidine are given.
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Fenton chemistry is not straightforward and is performed through numerous reactions depending on active intermediates such as [FeIVO]2+ and hydroxyl radicals.
“Fenton chemistry is not straightforward, and it is performed through numerous reactions, depending upon various active intermediates, such as [Fe IV O] 2+ and hydroxyl radicals 84,85 .”
From Removal of heavy metal ions from wastewater: a comprehensive and critical review (2021) · cites this paper as [85]
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- Authors
- Bossmann, S. H., Oliveros, E., Göb, S., Siegwart, S., Dahlen, E. P., Payawan, L., Straub, M., Wörner, M., & Braun, A. M.
- Affiliations
- Karlsruhe Institute of Technology (DE)
- Venue
- The Journal of Physical Chemistry A
- Publisher
- American Chemical Society (ACS)
- Published
- 1998-04-17
- Volume
- 102
- Issue
- 28
- Pages
- 5542-5550
- ISSN
- 1089-5639 (ISSN-L)
- 1520-5215
- OpenAlex
- W2022892498
- Cited by
- 581
- References
- 43
- Citations by year
- 2026: 4 · 2025: 12 · 2024: 15 · 2023: 23 · 2022: 34 · 2021: 21 · 2020: 24 · 2019: 30 · 2018: 24 · 2017: 25 · 2016: 22 · 2015: 20 · 2014: 15 · 2013: 25 · 2012: 23
- FWCI
- 29.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry A (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Chemistry › Organic Chemistry › Oxidative Organic Chemistry Reactions
- Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
- Keywords
- hydroxyl radicals, Fenton reaction, 2,4-dimethylaniline, oxidative degradation, 2,4-dimethylphenol, electron transfer mechanism, Fe(III) reduction, quantum yield, hydrogen peroxide, UV irradiation
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