Article Dans Une Revue Environmental Chemistry Letters Année : 2026

The carbon dioxide radical anion as a reductant in water treatment and atmospheric chemistry: a review

Jonathan D Raff
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Mallikarjuna Nadagouda
Eric Lichtfouse
Dan Meyerstein
Virender Sharma

Résumé

The carbon dioxide radical anion, CO2•-, is a highly reactive radical species involved in the reduction of the CO2 greenhouse gas, organic synthesis, atmospheric aerosol chemistry, and treatment of halogenated compounds. In recent years, CO2•- has emerged as a strong reductant, or single electron donor. Here we present techniques used to generate CO2•- and we discuss applications to degrading pollutants such as halogenated alkanes. The potential occurrence of such reductions in water and aqueous aerosols is discussed, notably for the degradatio of perfluoroalkyl substances. In the laboratory, CO•- is directly generated by either direct electrochemical reduction of CO2 or hydrogen atom transfer of either formate salts with and without catalysts or ferrioxalate through photochemical or radiolytic processes. The CO2•- has an ultraviolet spectrum, and CO2•- vibration modes are characterized by fast kinetics using infrared and Raman spectroscopy. The second-order rate constants of the reactions of CO2•- with halogenated alkanes, of -1.84 ± 0.22 V, are generally slower than that of the hydrated electron, of -2.87 V, and give a negative linear relationship with energy of lower unoccupied molecular orbital, suggesting single electron transfer mechanism in reducing the halogenated compounds.

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hal-05481693 , version 1 (28-01-2026)

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Thomas Schaefer, Jonathan D Raff, Mallikarjuna Nadagouda, Eric Lichtfouse, Dan Meyerstein, et al.. The carbon dioxide radical anion as a reductant in water treatment and atmospheric chemistry: a review. Environmental Chemistry Letters, In press, ⟨10.1007/s10311-025-01894-9⟩. ⟨hal-05481693⟩
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