European Journal of Chemistry

Zinc oxide-catalyzed UV-photodegradation of cyhalothrin: A kinetic analysis

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COVERMAR2025
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Published: Mar 31, 2025
DOI: https://doi.org/10.5155/eurjchem.16.1.20-26.2598
Keywords:
Kinetics, Pesticide, Zinc oxide, Photodegradation, Ultraviolet irradiation, Photocatalytic activity
Section
Research Article
Issue
Vol. 16 No. 1 (2025): March 2025
Dates
Received 2024-09-20
Accepted 2025-02-14
Published 2025-03-31
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Seth Otieno Osumba
Department of Chemistry, Faculty of Science, Egerton University, Nakuru, P.O. Box 536, Njoro, 20115, Kenya
https://orcid.org/0009-0001-7225-2990
John Onyango Adongo
Department of Chemistry, Faculty of Science, Egerton University, Nakuru, P.O. Box 536, Njoro, 20115, Kenya
https://orcid.org/0000-0002-9719-1215
Josiah Ouma Omolo
Department of Chemistry, Faculty of Science, Egerton University, Nakuru, P.O. Box 536, Njoro, 20115, Kenya
https://orcid.org/0000-0001-9876-0179

Abstract

In this study, we present kinetic studies of the photodegradation of cyhalothrin (CyH) under ultraviolet (UV) irradiation and the photocatalytic activity of zinc oxide (ZnO) in UV-assisted photodegradation. CyH in an acetone solvent was periodically exposed to UV254 nm radiation light with a surface power density of 48 W/cm2. The photodegradation experiments were conducted by acquiring periodic wavelength-scan spectroscopic data using a double beam ultraviolet-visible (UV-vis) spectrophotometer and plotting the real-time absorbance data to monitor the reaction coordinate. Under our optimized conditions at room temperature of 26.5 °C, atmospheric pressure of 76.6 mmHg, CyH (5.0 ppm) in the 70% acetone solvent with pH = 6.8 and dose of ZnO (25 ppm) exhibited typical photodegradation efficiencies between 81.9 and 90.3 % within the first 1,200 seconds of UV irradiation. Spectroscopic data showed that the ZnO solution significantly elevated the UV-assisted photodegradation rate of CyH by about 7.03 - 7.18 times more than that of UV-only-mediated CyH photodegradation. The result confirmed and characterized the photocatalytic activity of ZnO. Under the optimized measurement conditions, the rate of the ZnO-catalyzed photodegradation of CyH was found to follow the first-order rate law (RSq. = 0.999).


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Osumba, S. O.; Adongo, J. O.; Omolo, J. O. Zinc Oxide-Catalyzed UV-Photodegradation of Cyhalothrin: A Kinetic Analysis. Eur. J. Chem. 2025, 16, 20-26.

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