Cooperation of multiple active species generated in hydrogen peroxide activation by iron porphyrin for phenolic pollutants degradation.
Environ Pollut
; 313: 120097, 2022 Nov 15.
Article
en En
| MEDLINE
| ID: mdl-36089136
ABSTRACT
The narrow acid pH range and the nonselectivity of the dominant â¢OH limit the Fenton systems to remediate the organic wastewater. Inspired by the role of heme in physiological processes, we employed iron porphyrin as a novel homogeneous catalyst to address this issue. Multiple active species are identified during the activation of H2O2, including high-valent iron porphyrin ((por)Fe(IV)) species ((por)Fe(IV)-OH, (por)+â¢Fe(IV)=O) and oxygen-centered radicals (â¢OH, HO2â¢/â¢O2-), as well as atomic hydrogen (*H) and carbon-centered radicals. With the cooperation of these active species, the degradation of pollutants could be resistant to the interference of concomitant ions and proceed over a wide pH range. This cooperative behavior is further verified by intermediates identified from bisphenol A degradation. Specifically, the presence of *H could facilitate the cleavage of the C-C bond and the addition of unsaturated or aromatic molecules. (Por)+â¢Fe(IV)=O could hydroxylate substrates with an oxygen rebound mechanism. Hydrogen atom abstraction of contaminants could be performed by (por)Fe(IV)-OH to form desaturated products by attacking oxygen-centered radicals. The ecotoxicity of bisphenol A could be significantly decreased through degradation. This study would provide a new approach to wastewater treatment and shed light on the interaction between metalloporphyrin and peroxide in an aqueous solution.
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Banco de datos:
MEDLINE
Asunto principal:
Porfirinas
/
Contaminantes Ambientales
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Metaloporfirinas
Idioma:
En
Año:
2022
Tipo del documento:
Article