Unraveling Hidden Infrared Spectral Signatures in PFAS Thermal Degradation with Two-Dimensional Correlation Spectroscopy

Environmental Science & Technology Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Language: Английский

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Photo-tunable ultrafast removal of organic dyes by azobenzene and phosphonium functionalized porous organic polymers

Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 335, P. 126119 - 126119

Published: Dec. 21, 2023

Language: Английский

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New Insights into Thermal Degradation Products of Long-Chain Per- and Polyfluoroalkyl Substances (PFAS) and Their Mineralization Enhancement Using Additives

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

The products of incomplete destruction (PIDs) per- and polyfluoroalkyl substances (PFAS) represent a substantial ambiguity when employing thermal treatments to remediate PFAS-contaminated materials. In this study, we present new information on PIDs produced in both inert oxidative environments from five long-chain PFAS, including three now regulated under the U.S. Safe Drinking Water Act, one cationic precursor compound, C10 PFAS. data did not support generation tetrafluoromethane any studied carbonyl fluoride was found only potassium perfluorooctanesulfonate (K-PFOS) heated air narrow temperature range. Oxidative conditions (air) were observed facilitate PFAS degradation accelerate mineralization K-PFOS. Spectroscopic suggest that is initiated by cleavage bonds form perfluoroalkyl radicals, leading organofluorine (e.g., perfluoroalkenes). air, radicals react with oxygen oxygen-containing PIDs. enhanced adding solid additives, which categorized as highly effective granular activated carbon (GAC) certain noble metals), moderately effective, noneffective. Remarkably, simply GAC, achieved >90% perfluorooctanoic acid at 300 °C ∼1.9 atm within just 60 min without using water or solvents.

Language: Английский

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Degradation and Defluorination of Ultra Short-, Short-, and Long-Chain PFASs in High Total Dissolved Solids Solutions by Hydrothermal Alkaline Treatment─Closing the Fluorine Mass Balance

ACS ES&T Engineering, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 25, 2024

Language: Английский

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Remediation of PFAS-impacted soils using magnetic activated carbon (MAC) and hydrothermal alkaline treatment (HALT)

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168931 - 168931

Published: Dec. 1, 2023

Language: Английский

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How to take ‘forever’ out of forever chemicals

Nature, Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 14, 2023

Language: Английский

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Chemical Strategies for the Cleavage of the C(sp³)−F Bonds in Perfluoroalkyl Groups

European Journal of Organic Chemistry, Journal Year: 2024, Volume and Issue: 27(11)

Published: Jan. 22, 2024

Abstract Perfluoroalkyl substances (PFAS) have been recognized as environmental pollutants. Hence, their efficient and mild destruction is a significant research interest. While many articles review papers reported the cleavage of C(sp 2 )−F bonds, single 3 bond, CF groups in PFAS, this study, limited emerging examples longer perfluoroalkyl group containing at least one repeating unit 1,1,2,2‐tetrafluoroethylene was focused. In Concept , we summarized recent progress on chemical defluorination PFAS via unactivated bonds under conditions (~150 °C). addition to classical reductive defluorination, strategies featuring Lewis acid activation transient generation an unsaturated bond were described.

Language: Английский

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Regeneration of PFAS-laden Granular Activated Carbon in Modified Supercritical CO2 Extraction

Published: June 3, 2024

Granular activated carbon (GAC) is used widely to treat PFAS-contaminated streams, resulting in large quantities of spent GAC that are landfilled or regenerated for future use. Herein, we report the development and application supercritical CO2 (scCO2) extraction modified with organic solvent acid modifier. The method yields > 97% desorption efficiency PFOA after ~60 minutes treatment a continuous flow reactor. mild conditions at ~100 °C do not trigger formation volatile fluorine alteration sorbent properties. Another benefit using scCO2 high miscibility co-solvent/scCO2, which eliminates diffusion transport limitations, enabling rapid PFAS into single-phase (gas-like) medium. introduction an co-solvent absence water as limit hydrophobic interactions between adsorbate. At same time, addition modifiers reduces electrostatic sorbents. Supercritical fluid (SFE) may prove effective other types sorbents, including various ion-exchange resins. SFE process can be economically regeneration scheme, leading reuse sorbents adsorption cycles achieving concentration effluent end-of-life technologies.

Language: Английский

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Regeneration of perfluorooctane sulfonic acid (PFOS) loaded granular activated carbon using organic/inorganic mixed solutions

Chemical Engineering Science, Journal Year: 2024, Volume and Issue: 300, P. 120623 - 120623

Published: Aug. 22, 2024

Language: Английский

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Nitrogen-Doped High-Surface-Area activated carbon: Innovative adsorbent for enhanced SO2 and benzene removal

Journal of Industrial and Engineering Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 1, 2024

Language: Английский

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