Fabrication and characterizations of Zn-doped SnO2-Ti4O7 anode for electrochemical degradation of hexafluoropropylene oxide dimer acid and its homologues

Journal of Hazardous Materials, Год журнала: 2023, Номер 455, С. 131605 - 131605

Опубликована: Май 9, 2023

Язык: Английский

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Oxidative Transformation of Nafion-Related Fluorinated Ether Sulfonates: Comparison with Legacy PFAS Structures and Opportunities of Acidic Persulfate Digestion for PFAS Precursor Analysis

Environmental Science & Technology, Год журнала: 2024, Номер 58(14), С. 6415 - 6424

Опубликована: Март 26, 2024

The total oxidizable precursor (TOP) assay has been extensively used for detecting PFAS pollutants that do not have analytical standards. It uses hydroxyl radicals (HO•) from the heat activation of persulfate under alkaline pH to convert H-containing precursors perfluoroalkyl carboxylates (PFCAs) target analysis. However, current TOP oxidation method does apply emerging because (i) many structures contain C–H bonds HO• attack and (ii) transformation products are necessarily PFCAs. In this study, we explored use classic acidic digestion, which generates sulfate (SO4–•), extend capability assay. We examined Nafion-related ether sulfonates or −COO–, characterized products, quantified F atom balance. SO4–• greatly expanded scope precursors. was initiated by decarboxylation, followed various spontaneous steps, such as HF elimination ester hydrolysis. further compared legacy fluorotelomers using versus HO•. results suggest novel product distribution patterns, depending on functional group oxidant dose. general trends strategies were also validated analyzing a mixture 100000- 10000-fold diluted aqueous film-forming foam (containing fluorotelomer surfactants organics) spiked Nafion precursor. Therefore, (1) combined oxidation, (2) list standard chemicals, (3) elucidation mechanisms will provide more critical information probe pollutants.

Язык: Английский

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Performance and Mechanism of Fe3O4 Loaded Biochar Activating Persulfate to Degrade Acid Orange 7

Water, Год журнала: 2023, Номер 15(10), С. 1849 - 1849

Опубликована: Май 12, 2023

Azo dye wastewater is a common type of organic that often presents significant challenge due to its gloomy color, high toxicity, and resistance degradation. The discharge such directly into natural water bodies can pose severe threat both ecological security human health. Traditional biological treatment methods are ineffective in treating industrial pollutants, but advanced oxidation technologies, as persulfate (PS), offer unique advantages their strong ability short reaction times. This study investigates the use modified biochar (BC) material catalyzed technology adsorb separate acid orange 7 (AO7), pollutant, from further oxidize degrade it. Wood chips were used templates create an efficient, eco-friendly, reusable adsorbent catalytic material. In this paper, adsorption effect Fe3O4@BC on AO7 was compared, kinetics isotherm different pollutants studied, possible mechanism proposed based relevant characterization. Adsorption describes rate quality by studying capacity process. Furthermore, activated PS system explore degradation at room temperature. First, performance evaluated examining amounts Fe3O4@BC, initial pH, ionic strength, reusability Fe3O4@BC. Then, through electron paramagnetic resonance (EPR), free radical quenching experiment, density functional theory (DFT) analysis. results suggest effective eco-friendly method for wastewater.

Язык: Английский

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New insights into the degradation mechanism and risk assessment of HFPO-DA by advanced oxidation processes based on activated persulfate in aqueous solutions

Ecotoxicology and Environmental Safety, Год журнала: 2023, Номер 263, С. 115298 - 115298

Опубликована: Июль 25, 2023

Hexafluoropropylene oxide dimer acid (HFPO-DA) is widely used as a substitute for perfluorooctanoic (PFOA). HFPO-DA exhibits high water solubility and low adsorption potential, conferring significant fluidity in aquatic environments. Given that the toxicity of similar to PFOA, it necessary control its content Electrochemical thermally-activated persulfates have been successfully degrade HFPO-DA, but UV-activated cannot compound. research on degradation mechanisms still incomplete lacks kinetic research, mechanism calculations oxidative were studied detail using DFT calculations. And intermediates products was evaluated reveal feasibility advanced oxidation process (AOP) technology based persulfate wastewater. The results showed committed step initiated by electron transfer reaction SO4•- radicals. This not spontaneous at room temperature requires sufficient electrical or thermal energy be absorbed from external environment. perfluoroalcohol produced during this can subsequently undergo four possible reactions: H atom abstraction alcohol groups an OH radical; SO4•-; direct HF removal; removal with catalyst. final mainly include CO2, CF3CF2COOH, CF3COOH, FCOOH HF, which has identified through previous experimental analysis. Ecotoxicity assessment indicates does produce highly toxic intermediates, are non-toxic, supporting persulfate-based AOP technologies.

Язык: Английский

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Rethinking alternatives to fluorinated pops in aqueous environment and corresponding destructive treatment strategies

The Science of The Total Environment, Год журнала: 2024, Номер 946, С. 174200 - 174200

Опубликована: Июнь 25, 2024

Язык: Английский

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Fluorophilic N, S self-doped porous carbon electrodes derived from biomass gelatin for electro-Fenton degradation of GenX

Journal of environmental chemical engineering, Год журнала: 2025, Номер unknown, С. 115386 - 115386

Опубликована: Янв. 1, 2025

Язык: Английский

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Degradation of novel PFOA alternatives in fluoropolymer production by UV activated persulfate: Efficiency, mechanism and structural effects

Journal of Hazardous Materials, Год журнала: 2025, Номер 492, С. 138121 - 138121

Опубликована: Апрель 6, 2025

Язык: Английский

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Sustainable cotton dyeing with reactive dyes in the recycled dyeing wastewater

Pigment & Resin Technology, Год журнала: 2024, Номер unknown

Опубликована: Фев. 1, 2024

Purpose This paper aims to find a suitable solution degrade the C.I. Reactive Red 24 (RR24) dyeing wastewater by using sodium persulphate recycle water and inorganic salts. Design/methodology/approach The effects of temperature, concentration salts Na 2 CO 3 initial pH value on degradation RR24 were studied. Furthermore, relationship between free radicals effect was investigated. Microscopic routes mechanisms dye further confirmed testing karyoplasmic ratio product. feasibility one-bath cyclic in recycled through properties utilization color parameters. Findings appropriate conditions 0.3 g/L treatment at 95°C for 30 min, which resulted decolorization rate 98.4% wastewater. Acidic are conducive rapid dyes, while ·OH or SO 4 − · have destructive dyes under alkaline conditions. In early stage degradation, played major role dyes. For sustainable RR24, reused this process uptake increased with times cycles. After fixation, some may be converted other salts, thereby increasing subsequent staining. However, it has little impact exhaustion parameters dyed fabrics. Originality/value recommended technology not only reduces quantity but also enables recycling water, meets requirements development clean production.

Язык: Английский

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A Review of Iron-Based Catalysts for Persulfate Activation to Remove PFAS in Water: Catalytic Effects of Various Iron Species, Influencing Factors and Reaction Pathways

Water Air & Soil Pollution, Год журнала: 2024, Номер 236(1)

Опубликована: Дек. 10, 2024

Язык: Английский

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Degradation of Beneficiation Reagent Ester-105 by Light, Heat, and Microwave Activated Persulfate

Water Air & Soil Pollution, Год журнала: 2024, Номер 235(2)

Опубликована: Янв. 22, 2024

Язык: Английский

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