Contrary to common expectations, the hydroxyl scavengers, carbonate and bicarbonate, are able to enhance the phototransformation by nitrate of a number of substituted phenols. Carbonate and bicarbonate, in addition to modifying the solution pH, are also able to induce a considerable formation of the carbonate radicals upon nitrate photolysis. The higher availability of less-reactive species than the hydroxyl radical would contribute to substantially enhance the photodegradation of the phenols/phenolates that are sufficiently reactive toward the carbonate radical. This phenomenon has a potentially important impact on the fate of the relevant compounds in surface waters. In contrast, the degradation of compounds that are not sufficiently reactive toward CO3-° radical is inhibited by carbonate and bicarbonate because of the scavenging of OH radicals.

Inhibition vs. enhancement of the nitrate-induced photo-transformation of organic substrates by the °OH scavengers bicarbonate and carbonate

VIONE, Davide Vittorio;MAURINO, Valter;MINERO, Claudio
2009-01-01

Abstract

Contrary to common expectations, the hydroxyl scavengers, carbonate and bicarbonate, are able to enhance the phototransformation by nitrate of a number of substituted phenols. Carbonate and bicarbonate, in addition to modifying the solution pH, are also able to induce a considerable formation of the carbonate radicals upon nitrate photolysis. The higher availability of less-reactive species than the hydroxyl radical would contribute to substantially enhance the photodegradation of the phenols/phenolates that are sufficiently reactive toward the carbonate radical. This phenomenon has a potentially important impact on the fate of the relevant compounds in surface waters. In contrast, the degradation of compounds that are not sufficiently reactive toward CO3-° radical is inhibited by carbonate and bicarbonate because of the scavenging of OH radicals.
2009
43
4718
4728
D. Vione; S. Khanra; S. Cucu Man; P.R. Maddigapu; R. Das; C. Arsene; R.I.Olariu; V. Maurino; C. Minero
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/99491
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