Elucidating the enhanced role of carbonate radical in propranolol degradation by UV/peroxymonosulfate system.
Chemosphere
; 357: 141985, 2024 Jun.
Article
em En
| MEDLINE
| ID: mdl-38614404
ABSTRACT
Carbonate radical (CO3â¢-) has been proved to be an important secondary radical in advanced oxidation processes due to various radical reactions involved HCO3-/CO32-. However, the roles and contributions of CO3â¢- in organic micropollutant degradation have not been explored systematically. Here, we quantified the impact of CO3â¢- on the degradation kinetics of propranolol, a representative pollutant in the UV/peroxymonosulfate (PMS) system, by constructing a steady-state radical model. Substantially, the measured values were coincident with the predictive values, and the contributions of CO3â¢- on propranolol degradation were the water matrix-dependent. Propranolol degradation increased by 130% in UV/PMS system containing 10 mM HCO3-, and the contribution of CO3â¢- was as high as 58%. Relatively high pH values are beneficial for propranolol degradation in pure water containing HCO3-, and the contributions of CO3â¢- also enhanced, while an inverse phenomenon was shown for the effects of propranolol concentrations. Dissolved organic matter exhibited significant scavenging effects on HOâ¢, SO4â¢-, and CO3â¢-, substantially retarding the elimination process. The developed model successfully predicted oxidation degradation kinetics of propranolol in actual sewage, and CO3â¢- contribution was up to 93%, which in indicative of the important role of CO3â¢- in organic micropollutant removal via AOPs treatment.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oxirredução
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Peróxidos
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Propranolol
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Raios Ultravioleta
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Poluentes Químicos da Água
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Carbonatos
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2024
Tipo de documento:
Article