Degradation of micropollutants in secondary wastewater effluent using nonthermal plasma-based AOPs: The roles of free radicals and molecular oxidants

Chen, Changtao; Ma, Chuanlong; Yang, Yongyuan; Yang, Xuetong; Demeestere, Kristof; Nikiforov, Anton; Hulle, Stijn Van

doi:10.1016/j.watres.2023.119881

Cited by 30 publications

(1 citation statement)

References 46 publications

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“…The effects of micropollutants (MPs) such as antibiotics on human health have attracted widespread attention. − Ferrate (Fe(VI)) is widely investigated in MP oxidation because it gives the nontoxic decomposition product Fe(III), can be used over a wide pH range, and has a strong oxidation capacity. − Additionally, because of the selective oxidation of electron-rich MPs, ferrate is less affected by coexisting substances in water compared to sulfate-based advanced oxidation processes. − However, Fe(VI) has an extremely fast hydrolysis rate in water, which leads to self-quenching of high-valent iron intermediates like Fe(IV) and Fe(V), and this affects its application to MP oxidation. , Therefore, improving the contribution of reactive species to the oxidation of MPs by avoiding self-quenching is of importance for decreasing the amount of required ferrate and promoting the oxidation efficiency of MPs. ,, …”

Section: Introductionmentioning

confidence: 99%

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

Wang,

Du,

Liu

et al. 2024

Environ. Sci. Technol.

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Many studies have investigated activation of ferrate (Fe(VI)) to produce reactive high-valent iron intermediates to enhance the oxidation of micropollutants. However, the differences in the risk of pollutant transformation caused by Fe(IV) and Fe(V) have not been taken seriously. In this study, Fe(VI)-alone, Fe3+/Fe(VI), and NaHCO3/Fe(VI) processes were used to oxidize fluoroquinolone antibiotics to explore the different effects of Fe(IV) and Fe(V) on product accumulation and toxicity changes. The contribution of Fe(IV) to levofloxacin degradation was 99.9% in the Fe3+/Fe(VI) process, and that of Fe(V) was 89.4% in the NaHCO3/Fe(VI) process. The cytotoxicity equivalents of levofloxacin decreased by 1.9 mg phenol/L in the Fe(IV)-dominant process while they significantly (p < 0.05) increased by 4.7 mg phenol/L in the Fe(V)-dominant process. The acute toxicity toward luminescent bacteria and the results for other fluoroquinolone antibiotics also showed that Fe(IV) reduced the toxicity and Fe(V) increased the toxicity. Density functional theory calculations showed that Fe(V) induced quinolone ring opening, which would increase the toxicity. Fe(IV) tended to oxidize the piperazine group, which reduced the toxicity. These results show the different-pollutant transformation caused by Fe(IV) and Fe(V). In future, the different risk outcomes during Fe(VI) activation should be taken seriously.

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Section: Introductionmentioning

confidence: 99%

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

Wang,

Du,

Liu

et al. 2024

Environ. Sci. Technol.

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Organic reactions in plasma–liquid systems for environmental applications

Gorbanev,

Nikiforov,

Fedirchyk

et al. 2024

Plasma Processes & Polymers

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Plasma–liquid systems are best recognised in biomedicine, where the generation of plasma‐treated water and complex organic‐containing solutions affords biological effects. However, plasma interactions with liquids are more diverse. In this review, we look from the chemical point of view at the three fields of plasma–liquid interaction in which plasma is used to convert organic substrates. In wastewater treatment, plasma decomposes organic substances: the selectivity towards specific products is less crucial than process energy costs. In the conversion of organic liquids for sustainable energy purposes, the carbon and hydrogen selectivity to syngas are important, but these are still destructive reactions yielding small molecules. Finally, we provide a comprehensive plasma application list for synthetic organic chemistry and discuss their mechanisms and limitations.

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Degradation of Micropollutants in Water by O Atoms Produced by an Atmospheric Pressure He/O₂ Plasma Jet

Chen,

Lukeš,

Jirásek

et al. 2024

Plasma Processes & Polymers

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An atmospheric pressure He/O2 COST reference microplasma jet was used to study interactions of O atoms with four different organic micropollutants used as target compounds treated by plasma in water (atrazine, carbamazepine, 1,7‐α‐ethinylestradiol, and bisphenol A). Various ratios of O2 to He were used to achieve different exposures of reactive oxygen species to the plasma‐treated micropollutants, and their degradation efficiencies were determined. The degradation of all four micropollutants was merely associated with the variable exposure to the O atom, whereas the role of O3 was minimal. A comprehensive investigation was conducted on the degradation pathways and toxicity reduction assessment of atrazine after the treatment by plasma.

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Degradation of micropollutants in secondary wastewater effluent using nonthermal plasma-based AOPs: The roles of free radicals and molecular oxidants

Cited by 30 publications

References 46 publications

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

Organic reactions in plasma–liquid systems for environmental applications

Degradation of Micropollutants in Water by O Atoms Produced by an Atmospheric Pressure He/O₂ Plasma Jet

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Degradation of micropollutants in secondary wastewater effluent using nonthermal plasma-based AOPs: The roles of free radicals and molecular oxidants

Cited by 30 publications

References 46 publications

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

How Should We Activate Ferrate(VI)? Fe(IV) and Fe(V) Tell Different Stories about Fluoroquinolone Transformation and Toxicity Changes

Organic reactions in plasma–liquid systems for environmental applications

Degradation of Micropollutants in Water by O Atoms Produced by an Atmospheric Pressure He/O2 Plasma Jet

Contact Info

Product

Resources

About

Degradation of Micropollutants in Water by O Atoms Produced by an Atmospheric Pressure He/O₂ Plasma Jet