Cutting-edge technologies and relevant reaction mechanism difference in treatment of long- and short-chain per- and polyfluoroalkyl substances: A review

Chemosphere, Год журнала: 2024, Номер 354, С. 141692 - 141692

Опубликована: Март 13, 2024

Язык: Английский

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Destruction and defluorination of PFAS matrix in continuous-flow supercritical water oxidation reactor: Effect of operating temperature

Chemosphere, Год журнала: 2023, Номер 327, С. 138358 - 138358

Опубликована: Март 9, 2023

Язык: Английский

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Alcohols radicals can efficiently reduce recalcitrant perfluorooctanoic acid

Water Research, Год журнала: 2023, Номер 245, С. 120557 - 120557

Опубликована: Сен. 1, 2023

Язык: Английский

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The complex ‘PFAS world’ - How recent discoveries and novel screening tools reinforce existing concerns

Current Opinion in Green and Sustainable Chemistry, Год журнала: 2023, Номер 40, С. 100775 - 100775

Опубликована: Фев. 4, 2023

In recent years, high-resolution mass spectrometry (HRMS)-based studies have highlighted an increasingly complex 'PFAS world' and thousands of per- polyfluoroalkyl substances (PFAS) are known today. Major new discoveries were made when previously unexplored PFAS sources or transformation pathways investigated HRMS was combined with other analytical methods. Advances in analysis data treatment pointed to blind spots, extensive suspect screening lists evaluation approaches become available. Research has a vital role making fit for broad application and, considering ongoing discussions supporting grouping PFAS, transitioning society towards fundamentally way regulating, monitoring managing PFAS.

Язык: Английский

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Treatment of per- and polyfluoroalkyl substances (PFAS): A review of transformation technologies and mechanisms

Journal of environmental chemical engineering, Год журнала: 2023, Номер 12(1), С. 111833 - 111833

Опубликована: Дек. 28, 2023

Язык: Английский

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Hydrothermal Destruction and Defluorination of Trifluoroacetic Acid (TFA)

Environmental Science & Technology, Год журнала: 2024, Номер 58(18), С. 8076 - 8085

Опубликована: Апрель 25, 2024

Per- and polyfluoroalkyl substances (PFAS) have received increased attention due to their environmental prevalence threat public health. Trifluoroacetic acid (TFA) is an ultrashort-chain PFAS the simplest perfluorocarboxylic (PFCA). While US EPA does not currently regulate TFA, its chemical similarity other PFCAs simple molecular structure make it a suitable model compound for studying transformation of PFAS. We show that hydrothermal processing in compressed liquid water transforms TFA at relatively mild conditions (T = 150–250 °C, P < 30 MPa), initially yielding gaseous products, such as CHF3 CO2, naturally aspirate from solution. Alkali amendment (e.g., NaOH) promotes mineralization CHF3, dissolved fluoride, formate, carbonate species final products. Fluorine carbon balances are closed using Raman spectroscopy fluoride ion selective electrode measurements experiments performed alkaline conditions, where gas yields negligible. Qualitative FTIR analysis allows establishing pathways; however, F-balance could be quantitatively without NaOH amendment. The kinetics under measured, showing little no dependency on concentration, indicating thermal decarboxylation rate-limiting step. A proposed mechanism motivates additional work generalize reaction pathways PFCAs.

Язык: Английский

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PFAS Porewater concentrations in unsaturated soil: Field and laboratory comparisons inform on PFAS accumulation at air-water interfaces

Journal of Contaminant Hydrology, Год журнала: 2024, Номер 264, С. 104359 - 104359

Опубликована: Апрель 28, 2024

Язык: Английский

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The efficacy of soil washing for the remediation of per- and poly-fluoroalkyl substances (PFASs) in the field

Journal of Hazardous Materials, Год журнала: 2022, Номер 445, С. 130441 - 130441

Опубликована: Ноя. 21, 2022

Язык: Английский

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Hydrothermal Alkaline Treatment (HALT) of Foam Fractionation Concentrate Derived from PFAS-Contaminated Groundwater

Environmental Science & Technology, Год журнала: 2023, Номер 57(44), С. 17154 - 17165

Опубликована: Окт. 19, 2023

While foam fractionation (FF) process has emerged as a promising technology for removal of per- and polyfluoroalkyl substances (PFASs) from contaminated groundwater, management the resulting concentrates with elevated concentrations PFASs (e.g., >1 g/L) remains challenge. Here, we applied hydrothermal alkaline treatment (HALT) to two derived FF field demonstration projects that treated aqueous film-forming (AFFF)-impacted groundwater. Results showed >90% degradation defluorination within 90 min (350 °C, 1 M NaOH) all 62 (including cations, anions, zwitterions) identified in concentrates. Observed rate constants individual perfluoroalkyl sulfonates (PFSAs, CnF2n+1–SO3–), most recalcitrant class PFASs, both were similar values measured previously other matrices, indicating initial PFAS PFHxSinit = 0.55 g/L), dissolved organic carbon (DOC; up 4.5 salt levels 325 mg/L chloride) do not significantly affect reaction kinetics. DOC was partially mineralized by treatment, but fraction (∼15%) recalcitrant. Spectroscopic characterization revealed molecular features HALT-recalcitrant fraction, nontarget high-resolution mass spectrometry tentatively 129 nonfluorinated molecules. Analysis energy requirements shows treating PFAS-contaminated HALT would add minimally (<5%) overall an integrated FF-HALT train.

Язык: Английский

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Advanced destruction technologies for PFAS in soils: Progress and challenges

Current Opinion in Environmental Science & Health, Год журнала: 2023, Номер 33, С. 100459 - 100459

Опубликована: Март 8, 2023

Язык: Английский

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