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. 2022 Jul 14;27(14):4507.
doi: 10.3390/molecules27144507.

Comparative Effect of UV, UV/H2O2 and UV/H2O2/Fe on Terbuthylazine Degradation in Natural and Ultrapure Water

José Antonio Andrades  1 , Manuel Lojo-López  1 , Agata Egea-Corbacho  1 , José María Quiroga  1
Affiliations

Comparative Effect of UV, UV/H2O2 and UV/H2O2/Fe on Terbuthylazine Degradation in Natural and Ultrapure Water

José Antonio Andrades et al. Molecules. .

Abstract

Different advanced oxidation processes (AOPs) (ultraviolet radiation, hydrogen peroxide photolysis and photo-Fenton) were applied to test the degradation of terbuthylazine in three types of water: (a) ultrapure water, (b) surface water from the Gaditana area (Los Hurones reservoir, Cádiz, Spain) and (c) groundwater from the Tempul spring in Jerez de la Frontera (Cádiz, Spain). The experiments were carried out on a laboratory scale, using two different types of reactors, batch and semi-continuous. In batch reactors, the most efficient process for the experiments carried out with both ultrapure water and underground groundwater was ultraviolet radiation, whereas for surface water from the Gaditana area, the process that obtained the best results was the photolysis of hydrogen peroxide with 2.5 mg L-1 of H2O2. In semi-continuous reactors, the most efficient process was the photolysis of hydrogen peroxide with 2.5 mg L-1 of H2O2 for all the matrices studied. In both types of reactors, terbuthylazine degradation percentages higher than 90% were achieved; the main difference was in the reaction time, which varied from minutes in the batch reactor to seconds in the semi-continuous reactor. In all the applied AOPs, N-terbutyl-6-hydroxy-N'ethyl-1,3,5-triazine-2,4-diamine (TBA-212) was generated as a reaction intermediate.

Keywords: UPLC-MS; UV reactors; advanced oxidation processes (AOPs); natural waters; terbuthylazine.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Semi-continuous reactor used for the degradation of terbuthylazine in ultrapure water, groundwater and water from the Gaditana area.
Figure 2
Figure 2
Degradation of the pesticide terbuthylazine in ultrapure water (a), groundwater (b) and water from the Gaditana area (c) by ultraviolet radiation (■), hydrogen peroxide photolysis (●) and photo-Fenton (▲) in a batch reactor.
Figure 2
Figure 2
Degradation of the pesticide terbuthylazine in ultrapure water (a), groundwater (b) and water from the Gaditana area (c) by ultraviolet radiation (■), hydrogen peroxide photolysis (●) and photo-Fenton (▲) in a batch reactor.
Figure 3
Figure 3
Degradation of the pesticide terbuthylazine in ultrapure water (a), groundwater (b) and water from the Gaditana area (c) by ultraviolet radiation (■), hydrogen peroxide photolysis (●) and Photo-Fenton (▲) in a semi-continuous reactor.
Figure 3
Figure 3
Degradation of the pesticide terbuthylazine in ultrapure water (a), groundwater (b) and water from the Gaditana area (c) by ultraviolet radiation (■), hydrogen peroxide photolysis (●) and Photo-Fenton (▲) in a semi-continuous reactor.
Figure 4
Figure 4
Mass chromatogram of terbuthylazine and its degradation products at time t = 0 and t = 120 s after UV irradiation in ultrapure water.
See this image and copyright information in PMC

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