The sulfate radical is a highly oxidizing reactive species occurring in advanced oxidation processes for water purification, such as in situ chemical oxidation. The efficiency of these remediation processes is affected by the quality of the treated water, and dissolved organic matter (DOM), as an important sink of the sulfate radical, can slow down the removal rates of target contaminants. Moreover, it has been recently shown that the photosensitized oxidation of some aromatic contaminants may be inhibited by the presence of DOM, most probably by reduction of oxidation intermediates, leading to reformation of the parent contaminant. With sulfate radical as the oxidizing species, we have measured, by competition kinetics, second-order reaction rate constants for various anilines and sulfonamide antibiotics and found them to be affected by the presence of DOM. Similarly to photosensitized oxidations, the results can partly be interpreted in terms of inhibition with reduction of oxidation intermediates.

Sulfate radical-induced oxidations of aquatic contaminants: Effect of dissolved organic matter on second-order rate constants

248th National Meeting (2014)

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