Oxidative degradation of chlorpyrifos using ferrate(VI): Kinetics and reaction mechanism.
Ecotoxicol Environ Saf
; 170: 259-266, 2019 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-30529921
ABSTRACT
In this study, we investigated the degradation kinetics of chlorpyrifos, an organophosphorus (OP) compound, using ferrate(VI), and investigated the potential of this iron-based chemical oxidant on chlorpyrifos removal from water and wastewater treatments. A series of kinetic experiments were conducted to evaluate the influence of various environmental factors, such as pH, oxidant dosages, as well as the presence of anions, cations, humic acid (HA), and different water matrices. Chlorpyrifos was completely removed within 300â¯s under the following optimum conditions [chlorpyrifos]0 =â¯1⯵M, [Fe(VI)]0[chlorpyrifos]0 =â¯1001, Tâ¯=â¯25⯰C, and pH =â¯7.0. Anions such as Cl-, SO42-, NO3-, and HCO3- and cations such as Fe3+, Cu2+, and NH4+ did not appear to influence the removal of chlorpyrifos. However, the presence of Ca2+, Mg2+, and HA in water inhibited the degradation of chlorpyrifos. Experiments on removing chlorpyrifos from tap water, river water, and synthetic wastewater were performed to demonstrate the practical applications of Fe(VI). Ten oxidation products of chlorpyrifos were identified using liquid chromatography-quadrupole-time-of flight-mass spectrometry (LC-Q-TOF-MS), and their structures were further elucidated using MS/MS spectra. Then, two degradation pathways were preliminarily proposed including the oxidation of the Pâ¯=â¯S bond, cleavage of C-O bond, and hydroxyl substitution reaction. In general, Fe(VI) could be used as an efficient technology for chlorpyrifos removal from water and wastewater treatments.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
/
Oxidantes
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Purificação da Água
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Clorpirifos
/
Ferro
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Ecotoxicol Environ Saf
Ano de publicação:
2019
Tipo de documento:
Article