Version 1
: Received: 14 May 2024 / Approved: 14 May 2024 / Online: 17 May 2024 (06:32:34 CEST)
How to cite:
Pérez-Lucas, G.; Campillo, A.; Navarro, S. Impact of Inorganic Anions on the Photodegradation of Herbicide Residues in Water by UV/Persulphate-Based Advanced Oxidation. Preprints2024, 2024050986. https://doi.org/10.20944/preprints202405.0986.v1
Pérez-Lucas, G.; Campillo, A.; Navarro, S. Impact of Inorganic Anions on the Photodegradation of Herbicide Residues in Water by UV/Persulphate-Based Advanced Oxidation. Preprints 2024, 2024050986. https://doi.org/10.20944/preprints202405.0986.v1
Pérez-Lucas, G.; Campillo, A.; Navarro, S. Impact of Inorganic Anions on the Photodegradation of Herbicide Residues in Water by UV/Persulphate-Based Advanced Oxidation. Preprints2024, 2024050986. https://doi.org/10.20944/preprints202405.0986.v1
APA Style
Pérez-Lucas, G., Campillo, A., & Navarro, S. (2024). Impact of Inorganic Anions on the Photodegradation of Herbicide Residues in Water by UV/Persulphate-Based Advanced Oxidation. Preprints. https://doi.org/10.20944/preprints202405.0986.v1
Chicago/Turabian Style
Pérez-Lucas, G., Aitor Campillo and Simón Navarro. 2024 "Impact of Inorganic Anions on the Photodegradation of Herbicide Residues in Water by UV/Persulphate-Based Advanced Oxidation" Preprints. https://doi.org/10.20944/preprints202405.0986.v1
Abstract
For some persistent pollutants, such as recalcitrant pesticides, the polluted water (urban, agricultural and/or industrial) treated by conventional wastewater treatment plants is in some cases insufficient to achieve the legally required level of purity. This issue is of particular concern in areas where low rainfall does not provide sufficient water resources to meet the needs of agriculture, requiring increased reuse of water from wastewater treatment plants. In this context, Advanced Oxidation Processes (AOPs) hold great promise for the removal of organic pollutants. This study first evaluates the effectiveness of UV/S2O8= compared to heterogeneous photocatalysis using UV/TiO2 processes on the degradation of two commonly used herbicides (terbutylazine and isoproturon) in aqueous solutions using a photoreactor. In addition. the effect of UV wavelength on the degradation efficiency of both herbicides was investigated. Although degradation rate was higher under UV-254/S2O8= nm than under UV-365/S2O8= nm, complete degradation of the herbicides (0.2 mg L-1) was achieved within 30 min under UV-366 nm using a Na2S2O8 dosage of 250 mg L-1 in the absence of inorganic anions. To assess the impact of water matrix, the individual and combined effects of sulphate, bicarbonate and chloride were evaluated. They can react with hydroxyl and sulphate radicals formed during AOPs to form new radicals with a lower redox potential. The results showed negligible effects of sulphate, while the combination of bicarbonate and chloride seemed to be the key for the decrease in herbicide removal efficiency found when working with complex matrices. Finally, the main intermediates detected during the photodegradation process were identified and the likely pathways are proposed and discussed.
Keywords
matrix effect; herbicides; water treatment; persulphate; titanium dioxide; photooxidation
Subject
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
