New insights into atrazine degradation by the novel manganese dioxide/bisulfite system: Product formation and Mn reuse

Guo, Qin; Guan, Chaoting; Luo, Luna; Wang, Zhen; Pan, Hanping; Jiang, Jin

doi:10.1016/j.jclepro.2022.133106

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…For Fenton oxidation, whatever the amount of iron, amidation is the most observed process followed by dealkylation after 50 min (Table 3), which is in agreement with the most recent work [29]. In the context of the use of ultrasound, a simple transformation of ATZ to HA is observed, as also observed by Shi when using a catalyst [33].…”

Section: Kinetics Of Metabolitessupporting

confidence: 90%

“…Samples were then chromatographically separated. Conventional sampling followed by LC-MS or LC-MS/MS [13,29] analysis requires incompressible time of minutes or even days when the instruments are unavailable for analysis. Our experimental set up (see Section 3.5.6) makes it possible to take samples in real time and to analyze samples with a cycle of 4 min.…”

Section: Sonolysis and Fenton Reaction Reactor Coupled To Lc-hrmsmentioning

confidence: 99%

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Real-Time Monitoring of the Atrazine Degradation by Liquid Chromatography and High-Resolution Mass Spectrometry: Effect of Fenton Process and Ultrasound Treatment

et al. 2022

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High resolution mass spectrometry (HRMS) was coupled with ultra-high-performance liquid chromatography (uHPLC) to monitor atrazine (ATZ) degradation process of Fenton/ultrasound (US) treatment in real time. Samples were automatically taken through a peristaltic pump, and then analysed by HPLC-HRMS. The injection in the mass spectrometer was performed every 4 min for 2 h. ATZ and its degradation metabolites were sampled and identified. Online Fenton experiments in different equivalents of Fenton reagents, online US experiments with/without Fe2+ and offline Fenton experiments were conducted. Higher equivalents of Fenton reagents promoted the degradation rate of ATZ and the generation of the late-products such as Ammeline (AM). Besides, adding Fe2+ accelerated ATZ degradation in US treatment. In offline Fenton, the degradation rate of ATZ was higher than that of online Fenton, suggesting the offline samples were still reacting in the vial. The online analysis precisely controls the effect of reagents over time through automatic sampling and rapid detection, which greatly improves the measurement accuracy. The experimental set up proposed here both prevents the degradation of potentially unstable metabolites and provides a good way to track each metabolite.

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Section: Kinetics Of Metabolitessupporting

confidence: 90%

Section: Sonolysis and Fenton Reaction Reactor Coupled To Lc-hrmsmentioning

confidence: 99%

Real-Time Monitoring of the Atrazine Degradation by Liquid Chromatography and High-Resolution Mass Spectrometry: Effect of Fenton Process and Ultrasound Treatment

et al. 2022

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“…Intriguingly, [DEA]/[DIA], [CDIT]/[DEA], and [ODIT]/[CDIT] ratio values were dependent on the nature of the reactive oxidants. Previous studies employed that [DEA]/[DIA] value as a diagnostic tool for probing the relative contribution of • OH and SO 4 •– in ATZ oxidation based on the markedly different quantified [DEA]/[DIA] values in • OH- and SO 4 •– -mediated transformation processes. ,,, Along this line of thought, product distribution was expected to be an internal indicator of the relative role of Fe(IV) and free radicals during oxidative abatement of ATZ. However, Fe(IV) was significantly inert in deisopropylation of ATZ, resulting in the extremely low production (0.21 μM) and yield (5.1%) of DIA (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…Intriguingly -mediated transformation processes. 14,43,47,48 Along this line of thought, product distribution was expected to be an internal indicator of the relative role of Fe(IV) and free radicals during oxidative abatement of ATZ. However, Fe(IV) was significantly inert in deisopropylation of ATZ, resulting in the extremely low production (0.21 μM) and yield (5.1%) of DIA (Figure 2d).…”

Section: •−mentioning

confidence: 99%

Kinetic and Mechanistic Insights into the Oxidative Transformation of Atrazine by Aqueous Fe(IV): Comparison with Hydroxyl and Sulfate Radicals

et al. 2023

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This study explored the oxidative transformation of atrazine (ATZ) by an aqueous iron(IV)−oxo complex (Fe(IV)) formed through ozonation of Fe(II) and compared it to ATZ oxidation by • OH and SO 4•− generated by ultraviolet (UV) irradiation of H 2 O 2 and peroxydisulfate (PDS), respectively. The second-order rate constant between Fe(IV) and ATZ was estimated to be greater than (5.18 ± 0.3) × 10 5 M −1 s −1 at pH 3, which was markedly higher than the reactivity of Fe(IV) toward various water matrices. Consequently, Fe(IV) achieved the most effective selective abatement of ATZ, compared with • OH-and SO 4•− -mediated processes. Moreover, in the Fe(II)/O 3 system, we identified six products of ATZ and grouped them into three types: dealkylation (desethyl-atrazine [DEA] and desisopropyl-atrazine), alkylic-oxidation (atrazine amide [CDIT] and 2-hydroxy-4-(2hydroxy-ethylamino)-6-isopropylamino-s-triazine), and dechlorination-hydroxylation (N-(4-hydroxy-6-(isopropylamino)-1,3,5-triazin-2-yl) acetamide and deethylhydroxyatrazine) products. These products also constituted the primary outcomes of ATZ in the UV/H 2 O 2 and UV/PDS systems. Mechanism analysis revealed that Fe(IV) and SO 4•− triggered the dealkylation of ATZ by electron transfer, whereas • OH initiated dealkylation by H-atom abstraction, which resulted in the reactive oxidant nature-dependent distribution of specific ATZ oxidation products. Specifically, the [CDIT]/[DEA] ratio was quantified as 0.2, 0.7, and 2.3 in Fe(IV)-,• OH-, and SO 4•− -mediated oxidation processes, respectively. Accordingly, this ratio was developed as a sensitive internal probe for evaluating the relative contribution of Fe(IV) and • OH/SO 4•− during ATZ oxidative abatement.

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Environmental fate, toxicological impact, and advanced treatment approaches: Atrazine degradation and emphasises on circular economy strategy

Singh,

Khan,

Ramadan

et al. 2024

Desalination and Water Treatment

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New insights into atrazine degradation by the novel manganese dioxide/bisulfite system: Product formation and Mn reuse

Cited by 4 publications

References 42 publications

Real-Time Monitoring of the Atrazine Degradation by Liquid Chromatography and High-Resolution Mass Spectrometry: Effect of Fenton Process and Ultrasound Treatment

Real-Time Monitoring of the Atrazine Degradation by Liquid Chromatography and High-Resolution Mass Spectrometry: Effect of Fenton Process and Ultrasound Treatment

Kinetic and Mechanistic Insights into the Oxidative Transformation of Atrazine by Aqueous Fe(IV): Comparison with Hydroxyl and Sulfate Radicals

Environmental fate, toxicological impact, and advanced treatment approaches: Atrazine degradation and emphasises on circular economy strategy

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