Cited by 20Advanced oxidation water treatmentUltrasound and Cavitation PhenomenaPesticide and Herbicide Environmental Studies

Sonochemical degradation of neonicotinoid pesticides in natural surface waters. Influence of operational and environmental conditions

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Domínguez, Joaquin R., González, Teresa, Correia, Sergio, Domínguez, Eva M.·2021·Environmental Research

Abstract

Neonicotinoids sonochemical oxidation at high-frequency ultrasound (MHz range) has been carried out in ultrapure and natural surface-water matrices (river, reservoir and wastewater treatment plant effluent). To evaluate the influence of the operating variables, that is initial pollutant concentration, ultrasound frequency, ultrasound power, and pulse-stop time a Box-Behnken experimental design was planned. Optimal results were obtained using a frequency of 578 kHz, a power of 40 W L-1, with a pollutant concentration of 1 μM (for each pesticide), and using a pulse-stop time of 100 ms. The experimental data adjustment using the Langmuir-Hinshelwood heterogeneous kinetic model showed that neonicotinoids oxidation was carried out in the bubble-liquid interface by the attack of hydroxyl radicals. Experiments performed in the presence of radical scavengers, that is, methanol, ethanol and tert-butyl alcohol corroborated this reaction mechanism. The influence of some environmental conditions such as pH, presence of soluble inorganic species (Cl-, SO 42-, NO 3-, HPO 42-, HCO 3-) and soluble organic species (humic acids content) were established. Finally, the aqueous matrix's influence was investigated for three natural surface water cases, and the results were rationalized according to the main water physicochemical characteristics.

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Crossref · 10.1016/j.envres.2021.111021

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Authors
Domínguez, J. R., González, T., Correia, S., & Domínguez, E. M.
Affiliations
Universidad de Extremadura (ES)
Venue
Environmental Research
Publisher
Elsevier BV
Published
2021-06
Volume
197
Pages
111021
ISSN
0013-9351 (ISSN-L)
OpenAlex
W3137604248
Cited by
20
References
42
Citations by year
2026: 3 · 2025: 4 · 2024: 6 · 2023: 5 · 2022: 1 · 2021: 1
FWCI
0.97
Type
journal article
Language
en
Open access
Locations
  • Environmental Research (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repository University of Extremadura (University of Extremadura) (submittedVersion, other-oa)
Funders
  • Ministerio de Economía y Competitividad
  • Junta de Extremadura
  • Comisión Interministerial de Ciencia y Tecnología
  • European Regional Development Fund (GR18043, IB16016)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Physical Sciences › Materials Science › Materials Chemistry › Ultrasound and Cavitation Phenomena
  • Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
Keywords
neonicotinoids, sonochemical degradation, high-frequency ultrasound, hydroxyl radicals, Langmuir-Hinshelwood kinetics, bubble-liquid interface, radical scavengers, humic acid, inorganic anions, pH effect, river water, reservoir water, wastewater treatment plant effluent, Box-Behnken design
MeSH terms
Neonicotinoids, Humic Substances, Oxidation-Reduction, Pesticides, Water Pollutants, Chemical, Hydroxyl Radical, Water Purification

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