Chloride promoted oxidation of tritosulfuron by peroxymonosulfate
Metadatos
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Mathematical modelling Peroxymonosulfate Kinetics Tritosulfuron Intermediates
Fecha
2018-05-21Referencia bibliográfica
Published version: Rivas, F. Javier y Rodríguez Solís, Rafael. Chloride promoted oxidation of tritosulfuron by peroxymonosulfate. Chemical Engineering Journal 349, 2018, 728-736. [https://doi.org/10.1016/j.cej.2018.05.117]
Patrocinador
Gobierno de Extremadura (GRU15033); MINECO of Spain (CTQ2015/64944-R); European Regional Development FundsResumen
Tritosulfuron has been eliminated by continuous addition of potassium
peroxymonosulfate to an aqueous solution containing the herbicide and chloride ions. The
influence of Cl- content (6·10-5–22.5·10-4 M), inlet peroxymonosulfate concentration
(0.05–0.2 M), initial tritosulfuron amount (0.5–2.5 mg L-1) and temperature (298–333 K)
has been assessed. Tritosulfuron oxidation by HClO has been experimentally calculated
to be in the proximity of 4.03±0.15·1013exp(-7989/T) M-1s-1. Experimental data suggested
the existence of an inefficient peroxymonosulfate decomposition, likely associated to the
experimental setup used. A simple mechanism of first order ordinary differential
equations is capable of acceptably simulate the profiles of tritosulfuron and
peroxymonosulfate accumulated in the reactor, considering the formation of active
chlorine species from the interaction of peroxymonosulfate and chloride. First oxidation
intermediates have been identified by means of liquid chromatography coupled to high
resolution mass spectrometry. The attack by hydroxyl radicals and the addition of
chlorine have been appreciated in these generated species. An oxidation mechanism has
also been proposed. The evolution of intermediates with reaction time indicates that few
compounds are recalcitrant to the peroxymonosulfate/chloride system.