Decomposition of atrazine by ionizing radiation: Kinetics, degradation pathways and influence of radical scavengers

Khan, Javed Ali; Shah, Noor S.; Khan, Hasan M.

doi:10.1016/j.seppur.2015.09.064

Cited by 65 publications

(7 citation statements)

References 40 publications

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“…Only 65% removal efficiency was obtained for 200 ppm initial concentration while 97% for 100 ppm. This result is in agreement with published findings for the radiolytic decomposition of some other organic pollutants (Khan et al ( 2014 , 2015 ), Sayed et al ( 2016 ). It may be explained by the fact that at higher concentration, excess by-products could be produced, which may possibly scavenge the reactive radicals and thereby decreasing the effective concentration of these radicals.…”

Section: Resultssupporting

confidence: 94%

Impact of gamma-irradiation on the degradation and mineralization of hydroxychloroquine aqueous solutions

Zaouak

Jebali

Chouchane

et al. 2022

Int. J. Environ. Sci. Technol.

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In this work, the effect of gamma irradiation emitted by Cobalt 60 source has been investigated for the degradation of hydroxychloroquine (HCQ). The monitoring of the gamma irradiation treatment of HCQ aqueous solutions was followed by UV–visible, chemical oxygen demand, total organic carbon (TOC) and LC/MS analyses. Effects of several important parameters such as concentration, dose rate and pH on the degradation efficiency were studied then evaluated. Achieved results showed that % TOC removal efficiency of 98.5 was obtained after 8 kGy absorbed dose which warrants HCQ mineralization. The process was found to be more efficient when the initial pollutant concentration was low, with higher dose rate and at neutral pH. Furthermore, HCQ degradation kinetic study revealed a pseudo-first-order kinetic. Additionally, based on by-products identified by LC/MS, a degradation mechanistic schema mediated through hydroxyl radicals generated by water radiolysis has been proposed. Finally, in order to check the potential industrial application viability the energy consuming was evaluated.

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Section: Resultssupporting

confidence: 94%

Impact of gamma-irradiation on the degradation and mineralization of hydroxychloroquine aqueous solutions

Zaouak

Jebali

Chouchane

et al. 2022

Int. J. Environ. Sci. Technol.

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“…As is shown in Figure 5, the dominant atrazine metabolic reactions are dechlorination, dealkylation, and deamination. The synergistic effect of humic acid was also confirmed by Khan et al [75]. As a result of the reaction with e aq − and the • OH radical, a high degree of organic chlorine and nitrogen mineralization to chloride, nitrate, and ammonium ions can be achieved.…”

Section: Atrazine Degradationsupporting

confidence: 52%

Application of Radiation Technology in Removing Endocrine Micropollutants from Waters and Wastewaters—A Review

Bojanowska-Czajka

2021

Applied Sciences

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Advanced Oxidation Processes (AOPs) are increasingly being adopted as a post-treatment after conventional wastewater treatment, mainly due to the efficient removal of biodegradable organic micropollutants. Endocrine disruptors are a specific group of such micropollutants. Many scientific studies demonstrate their extremely harmful effects on living organisms, even at low concentrations in water and wastewater. AOPs based on the generation of reactive species using radiation technologies, these being gamma radiation and electron beam, are still not being used to their full potential. This publication presents the application possibilities of using ionizing radiation for the degradation of selected endocrine micropollutants in water and wastewater.

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“…Due to its slow degradation in natural conditions, the indiscriminate use of atrazine has been associated with contamination of soil and water resources (Khan et al, 2015;Ouyang et al, 2016), which results in deleterious effects on soil microbiota, on plant and animal non-target species and even on human health (Graymore et al, 2001;Dalton and Boutin, 2010;Sathiakumar et al, 2011;Chen et al, 2015). In this context, modified-release systems offer an alternative technique that may reduce environmental contamination by herbicides, as well as increase the efficiency of the bioactive compound (Campos et al, 2014;Prasad et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Post-Emergence Herbicidal Activity of Nanoatrazine Against Susceptible Weeds

Sousa

Gomes

Campos³

et al. 2018

Front. Environ. Sci.

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Poly(ε-caprolactone) (PCL) nanocapsules have been previously developed as a carrier system for atrazine. However, the efficacy of this nanoformulation against weeds commonly found in crop cultures has not been tested yet. Here, we evaluated the post-emergence herbicidal activity of PCL nanocapsules containing atrazine against Amaranthus viridis (slender amaranth) and Bidens pilosa (hairy beggarticks), in comparison with a commercial formulation of atrazine. For both species, treatment with atrazine-loaded nanocapsules (at 2,000 g ha −1) led to a greater decrease in the photosystem II activity (above 50% inhibition relative to the control) than the commercial atrazine formulation at the same concentration (around 40% inhibition). The growth of A. viridis plants was equally reduced by nanoatrazine and commercial formulation (above 64% for root and 75% for shoot). In the case of B. pilosa, atrazine-loaded nanocapsules decreased more effectively the root and shoot growth than the commercial formulation, leading to a loss of plant biomass. Moreover, for both species, the use of 10-fold diluted atrazine-loaded PCL nanocapsules (200 g ha −1) resulted in the same inhibitory effect in root and shoot growth as the commercial formulation at the standard atrazine dose. These results suggest that the utilization of atrazine-containing PCL nanocapsules potentiated the post-emergence control of A. viridis and B. pilosa by the herbicide. Thus, this nanoformulation emerges as an efficient alternative for weed control.

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Decomposition of atrazine by ionizing radiation: Kinetics, degradation pathways and influence of radical scavengers

Cited by 65 publications

References 40 publications

Impact of gamma-irradiation on the degradation and mineralization of hydroxychloroquine aqueous solutions

Impact of gamma-irradiation on the degradation and mineralization of hydroxychloroquine aqueous solutions

Application of Radiation Technology in Removing Endocrine Micropollutants from Waters and Wastewaters—A Review

Post-Emergence Herbicidal Activity of Nanoatrazine Against Susceptible Weeds

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