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Sizing the ozone Fenton reaction pathways: Ferryl vs hydroxyl

Gu, Alan and Hoffmann, Michael Robert and Colussi, Agustín J. (2020) Sizing the ozone Fenton reaction pathways: Ferryl vs hydroxyl. In: 260th ACS National Meeting & Exposition, 23-27 August 2020, San Francisco, CA.

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Ozone Fenton chem. between a ferrous ion (Fe²⁺) and ozone (O₃) produces ferryl ion (Fe(IV)O²⁺) through O-atom transfer and hydroxyl radical (.OH) through single-electron transfer reaction, and so far the two products have been studied sep. This work investigates their relative importance using di-Me sulfoxide (Me₂S=O, DMSO) as a representative org. substrate and online/offline electrospray mass-spectrometry (ESI-MS) as the anal. technique. Ozone-Fenton reaction occurs at the interface of an aq. DMSO/Fe²⁺ jet and an intersecting O₃ stream in online ESI-MS, and in the bulk aq. phase of a converging stream of DMSO/Fe²⁺ soln. and O₃ soln. in offline ESI-MS. We measure the ratio of ferrylproducts : hydroxyl-products to be 300-1600 at air-water interface, at 10⁵ faster rate than in bulk. The presence of ligands expands the range of ratio to 100-8000 while increasing the overall yield by up to a factor of 4. The ferryl ion in all tested conditions play a more important role than hydroxyl radical in ozone Fenton chem. in acidic aq. medium, a typical condition in atm. aerosols.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Paper
Hoffmann, Michael Robert0000-0001-6495-1946
Colussi, Agustín J.0000-0002-3400-4101
Additional Information:© 2020 American Chemical Society.
Record Number:CaltechAUTHORS:20201221-100137305
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107234
Deposited By: Tony Diaz
Deposited On:21 Dec 2020 19:33
Last Modified:21 Dec 2020 19:33

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