Analysis and modelling of photodegradation of neonicotinoid insecticides under the influence of UVA-LED radiation

Kosar, Vanja; Kurt, Filip; Tomašić, Vesna; Zelić, Ivana Elizabeta

doi:10.1007/s11144-021-02075-9

Reac Kinet Mech Cat

2021

DOI: 10.1007/s11144-021-02075-9

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Analysis and modelling of photodegradation of neonicotinoid insecticides under the influence of UVA-LED radiation

Vanja Kosar

Filip Kurt

Vesna Tomašić

et al.

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2024

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Cited by 2 publications

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“…Therefore, significant attention has been devoted to investigating the degradation of such EC in water and soils ( 2 , 19 – 24 ) both because of their presence in surface waters and for purposes of removing them from wastewater. However, characterization of their interactions with atmospheric oxidants remains scarce.…”

mentioning

confidence: 99%

Top–down versus bottom–up oxidation of a neonicotinoid pesticide by OH radicals

Wang,

Wingen

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Emerging contaminants (EC) distributed on surfaces in the environment can be oxidized by gas phase species (top–down) or by oxidants generated by the underlying substrate (bottom–up). One class of EC is the neonicotinoid (NN) pesticides that are widely distributed in air, water, and on plant and soil surfaces as well as on airborne dust and building materials. This study investigates the OH oxidation of the systemic NN pesticide acetamiprid (ACM) at room temperature. ACM on particles and as thin films on solid substrates were oxidized by OH radicals either from the gas phase or from an underlying TiO 2 or NaNO 2 substrate, and for comparison, in the aqueous phase. The site of OH attack is both the secondary >CH 2 group as well as the primary –CH 3 group attached to the tertiary amine nitrogen, with the latter dominating. In the case of top–down oxidation of ACM by gas phase OH radicals, addition to the –CN group also occurs. Major products are carbonyls and alcohols, but in the presence of sufficient water, their hydrolyzed products dominate. Kinetics measurements show ACM is more reactive toward gas phase OH radicals than other NN nitroguanidines, with an atmospheric lifetime of a few days. Bottom–up oxidation of ACM on TiO 2 exposed to sunlight outdoors (temperatures were above 30 °C) was also shown to occur and is likely to be competitive with top–down oxidation. These findings highlight the different potential oxidation processes for EC and provide key data for assessing their environmental fates and toxicologies.

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mentioning

confidence: 99%

Top–down versus bottom–up oxidation of a neonicotinoid pesticide by OH radicals

Wang,

Wingen

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Degradation of the neonicotinoid pesticide imidacloprid by electrocoagulation and ultrasound

Halkijevic,

Licht,

Kosar

et al. 2024

Sci Rep

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Imidacloprid is still a widely used neonicotinoid insecticide that is banned in many countries because of the associated environmental risks. Due to the inefficiency of conventional wastewater treatments for pesticide removal, new treatment methods are being investigated. Electrochemical methods, including electrocoagulation (EC), seem to be promising alternatives considering their effectiveness in removing various pollutants from wastewater. The aim of this study was to investigate the effects of electrode material, current density, ultrasound, and operation time on the efficiency of imidacloprid removal from a model solution by EC. The combination of aluminum electrodes and 20 A of applied current for 20 min resulted in total imidacloprid degradation. A simplified energy balance was introduced as a form of process evaluation. Combining ultrasound with EC resulted in 7% to 12% greater efficacy than using only EC.

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Analysis and modelling of photodegradation of neonicotinoid insecticides under the influence of UVA-LED radiation

Cited by 2 publications

References 21 publications

Top–down versus bottom–up oxidation of a neonicotinoid pesticide by OH radicals

Top–down versus bottom–up oxidation of a neonicotinoid pesticide by OH radicals

Degradation of the neonicotinoid pesticide imidacloprid by electrocoagulation and ultrasound

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