期刊
DESALINATION AND WATER TREATMENT
卷 276, 期 -, 页码 237-249出版社
DESALINATION PUBL
DOI: 10.5004/dwt.2022.28902
关键词
Profenofos; Photo-assisted peroxidation; Kinetics study; Degradation pathways; By-products identification
资金
- Fundacao de Apoio a Pesquisa do Estado da Paraiba (FAPESQ)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal Nivel Superior (CAPES)
- Financiadora de Estudos e Projetos (FINEP)
This article presents a detailed study on the oxidation mechanism and kinetics of profenofos by HO center dot radicals. The oxidation reaction showed different behaviors in acidic and basic environments. Various oxidation by-products and reaction intermediates were identified, and the main mechanisms involved in the mineralization process were analyzed.
This article presents, in detail, the paths and mechanisms, main by-products, and a kinetic study of the oxidation of profenofos (PFF) by HO center dot radicals. Photo-assisted peroxidation was the precursor reaction for generation of radicals; the effect of UV-C (245 nm) radiation was evaluated. The results of the kinetics study indicated that the best fit for the experimental data was the pseudo-first-order model; further, that oxidation occurs in a fast initial stage and a slow final stage. In an acidic environment, the fast oxidation stage was favored over the slow stage; while in the basic medium the opposite behavior was observed. Eight oxidation by-products and 29 reaction intermediates were identified. The main mechanisms involved in the mineralization of PFF were reactions of electron abstraction, HO center dot abstraction, H-center dot abstraction, substitution, displacement, and addition of electrons. The rapid oxidation step was related to the mining of the O-C2H5 and S-C3H7 chains of the intermediate O-ethyl S-propyl phosphonothioate. The slow oxidation step included the mineralization of 4-bromo-2-chlorophenyl and derivatives.
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