Simultaneous Degradation of Hexazinone and Diuron Herbicides by H<sub>2</sub>O<sub>2</sub>/UV and Toxicity Assessment

Martins, Alysson Stefan; Ferreira, Tanare C. R.; Carneiro, Renato Lajarim; Lanza, Marcos R.V.

doi:10.5935/0103-5053.20140184

Cited by 6 publications

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“…Visible light did not degrade hexazinone with or without H 2 O 2 . Previously, hexazinone was shown to be resistant to the photolysis alone at pH 2.8 (Martins et al 2014 ), but the information under environmentally relevant pH was lacking. The generation of reactive • OH from H 2 O 2 under irradiation results in the degradation of organic contaminants (Kim et al 2009 ; Wang et al 2017 ; Jasemizad et al 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…The photodegradation and photocatalytic degradation of hexazinone have been previously reported in the UV/ H 2 O 2 process under acidic conditions (Martins et al 2014) and UV/TiO 2 process (Mei et al 2012), respectively. However, its fate under AOPs and adsorption on CSGAC has not been mechanistically investigated, especially under environmentally relevant conditions.…”

Section: Introductionmentioning

confidence: 91%

“…It was first registered by the United States Environmental Protection Agency (US EPA) in 1975 for weed control and classified as a group D carcinogen. It can also cause throat, eye, and nose irritation (Martins et al 2014 ). It is unsusceptible to photolysis, hydrolysis, and microbial degradation, adding to its persistence in the aquatic environment and resulting in serious environmental concerns (Bouchard et al 1985 ; Mei et al 2012 ; Yao et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Jasemizad

Padhye

2022

Environ Sci Pollut Res

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Hexazinone, a globally applied broad-spectrum triazine herbicide, has not been mechanistically investigated previously under advanced oxidation processes (AOPs) and adsorption on activated carbon. In this study, its fate during UV-based oxidation with/without hydrogen peroxide (H2O2) and adsorption on coconut shell–based granular activated carbon (CSGAC) in water matrices was investigated. A comparison between various irradiation sources (visible, UVA, UVB, and UVC) revealed the highest degradation rate under UVC. More than 98% degradation of hexazinone was observed under 3 J cm−2 UVC fluence in the presence of 0.5 mM H2O2 at pH 7. Moreover, the degradation rate enhanced significantly with an increase in the initial dosage of H2O2, UV fluence, and contact time in the UV/H2O2 process. The rate of degradation was lower using secondary effluent than that of Milli-Q water due to the presence of dissolved organics in wastewater. However, the reactions in both matrices obeyed pseudo-first-order kinetics. The effect of different scavengers, including methanol, potassium iodide (KI), and tert-butyl alcohol (TBA), showed that hydroxyl radicals (•OH) played a dominant role in hexazinone degradation in the UV/H2O2 process. Hexazinone was effectively adsorbed by CSGAC through π-π electron donor–acceptor interactions between hexazinone’s triazine ring and CSGAC’s surface functional groups. The isotherm and kinetic studies showed that the adsorption followed the Freundlich model and pseudo-second-order reaction, respectively, suggesting chemisorption. This study provided mechanistic insights on the removal of hexazinone at the tertiary stage of wastewater treatment or the advanced treatment of wastewater reuse.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Jasemizad

Padhye

2022

Environ Sci Pollut Res

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“…Its further activation to yield hydroxyl radicals ( % OH) gives rise to the so-called H 2 O 2 -based advanced oxidation processes (AOPs), which show great performance for the transformation of toxic, (bio)refractory pollutants into innocuous by-products. H 2 O 2 can be activated by UV [1] and metal catalysts like Fe 2 + [2], as well as at high temperature and pressure in hot AOPs. Currently, the most widespread method for H 2 O 2 production at large scale is the anthraquinone cyclic process, although emerging alternatives have been recently developed [3].…”

Section: Introductionmentioning

confidence: 99%

On-site H2O2 electrogeneration at a CoS2-based air-diffusion cathode for the electrochemical degradation of organic pollutants

Ridruejo

Alcaide

Álvarez

et al. 2018

Journal of Electroanalytical Chemistry

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This work reports, for the first time, the manufacture and use of an air-diffusion cathode containing CoS 2 nanoparticles to enhance the H 2 O 2 electrogeneration. Hydrothermal synthesis allowed the formation of crystalline CoS 2 with pyrite structure, either unsupported or supported on carbon nanotubes. Both kinds of catalysts were characterized by X-ray diffraction and FE-SEM combined with energy dispersive X-ray analysis. The use of carbon nanotubes as support led to a remarkable enhancement of the CoS 2 stability, as deduced from cyclic voltammetry analysis. The electrochemical activity of the CoS 2-based materials towards the oxygen reduction reaction (ORR) in acidic medium was examined by potentiodynamic techniques using a rotating disk electrode. Both catalysts showed activity towards the ORR, being predominant the twoelectron pathway to form H 2 O 2 as main product. A novel CoS 2-on-carbon nanotubes catalyzed air-diffusion cathode, as well as an uncatalyzed one made for comparison, was manufactured to electrogenerate H 2 O 2 under galvanostatic conditions in an undivided two-electrode cell. A concentration of 56.9 mM was found with the former cathode at 100 mA cm − 2 , much > 32.0 mM found with the uncatalyzed cathode. This informs about the high performance of the CoS 2 nanoparticles to promote the two-electron ORR. Finally, the treatment of aqueous solutions of the anaesthetic tetracaine at pH 3.0 and 100 mA cm − 2 by electro-oxidation and photoelectro-Fenton processes demonstrated the viability of the manufactured CoS 2-based cathode for water treatment.

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“…O diuron, de nome químico [3-(3,4-dichlorophenyl)-1,1-dimethylurea], pertence ao grupo das uréias, sendo aplicado em pré ou pós-emergência. É um herbicida pouco solúvel e não ionizável (PPDB) recomendado para o controle de folhas largas e estreitas, atuando no fotossistema II do alvo (HOLMES, 2014;MARTINS et. al., 2014 (ALISTER et.…”

Section: Diuronunclassified

Perdas de hexazinona e diuron por escoamento superficial em sistema de cana crua

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Simultaneous Degradation of Hexazinone and Diuron Herbicides by H₂O₂/UV and Toxicity Assessment

Cited by 6 publications

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Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

On-site H2O2 electrogeneration at a CoS2-based air-diffusion cathode for the electrochemical degradation of organic pollutants

Perdas de hexazinona e diuron por escoamento superficial em sistema de cana crua

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Simultaneous Degradation of Hexazinone and Diuron Herbicides by H2O2/UV and Toxicity Assessment

Cited by 6 publications

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Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

On-site H2O2 electrogeneration at a CoS2-based air-diffusion cathode for the electrochemical degradation of organic pollutants

Perdas de hexazinona e diuron por escoamento superficial em sistema de cana crua

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Simultaneous Degradation of Hexazinone and Diuron Herbicides by H₂O₂/UV and Toxicity Assessment