Vapor Pressure of Nine Perfluoroalkyl Substances (PFASs) Determined Using the Knudsen Effusion Method

Zhang, Mengke; Yamada, Kyle; Bourguet, Stephen; Guelfo, Jennifer L.; Suuberg, Eric M.

doi:10.1021/acs.jced.9b00922

Cited by 25 publications

(11 citation statements)

References 62 publications

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“…The close agreement in PFAS phase transition parameters (e.g., MP) in different atmospheres, as shown in Figure , provides a high level of confidence in the results. The DSC-derived MPs of PFOA (48–52 °C) and K-PFOS (283 °C) agree well with the literature values (46–52 °C for PFOA ,, and 277–280 °C for K-PFOS).…”

Section: Results and Discussionmentioning

confidence: 99%

Thermal Phase Transition and Rapid Degradation of Forever Chemicals (PFAS) in Spent Media Using Induction Heating

et al. 2023

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In this study, we have developed an innovative thermal degradation strategy for treating per- and polyfluoroalkyl substance (PFAS)-containing solid materials. Our strategy satisfies three criteria: the ability to achieve near-complete degradation of PFASs within a short timescale, nonselectivity, and low energy cost. In our method, a metallic reactor containing a PFAS-laden sample was subjected to electromagnetic induction that prompted a rapid temperature rise of the reactor via the Joule heating effect. We demonstrated that subjecting PFASs (0.001–12 μmol) to induction heating for a brief duration (e.g., <40 s) resulted in substantial degradation (>90%) of these compounds, including recalcitrant short-chain PFASs and perfluoroalkyl sulfonic acids. This finding prompted us to conduct a detailed study of the thermal phase transitions of PFASs using thermogravimetric analysis and differential scanning calorimetry (DSC). We identified at least two endothermic DSC peaks for anionic, cationic, and zwitterionic PFASs, signifying the melting and evaporation of the melted PFASs. Melting and evaporation points of many PFASs were reported for the first time. Our data suggest that the rate-limiting step in PFAS thermal degradation is linked with phase transitions (e.g., evaporation) occurring on different time scales. When PFASs are rapidly heated to temperatures similar to those produced during induction heating, the evaporation of melted PFAS slows down, allowing for the degradation of the melted PFAS.

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Section: Results and Discussionmentioning

confidence: 99%

Thermal Phase Transition and Rapid Degradation of Forever Chemicals (PFAS) in Spent Media Using Induction Heating

et al. 2023

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“…These modeled trends are further supported by the experimentally derived data shown in Figure 1b and an additional study which reported boiling points of C4−C8 PFCAs and PFSAs increasing from 121 to 192 °C and 210 to 249 °C, respectively. 35 Lower sublimation vapor pressures have been reported for an increasing number of fluorinated carbons, 52 again providing evidence that shorterchain PFASs are more volatile. Experimental vapor pressures versus temperature for a limited set of PFASs 53 are shown in Figure 1b.…”

Section: Surface Interactions and Volatilitymentioning

confidence: 97%

Critical Review of Thermal Decomposition of Per- and Polyfluoroalkyl Substances: Mechanisms and Implications for Thermal Treatment Processes

Wang

Lin

et al. 2022

Environ. Sci. Technol.

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Per-and polyfluoroalkyl substances (PFASs) are fluorinated organic chemicals that are concerning due to their environmental persistence and adverse human and ecological effects. Remediation of environmental PFAS contamination and their presence in consumer products have led to the production of solid and liquid waste streams containing high concentrations of PFASs, which require efficient and cost-effective treatment solutions. PFASs are challenging to defluorinate by conventional and advanced destructive treatment processes, and physical separation processes produce waste streams (e.g., membrane concentrate, spent activated carbon) requiring further post-treatment. Incineration and other thermal treatment processes are widely available, but their use in managing PFAS-containing wastes remains poorly understood. Under specific operating conditions, thermal treatment is expected to mineralize PFASs, but the degradation mechanisms and pathways are unknown. In this review, we critically evaluate the thermal decomposition mechanisms, pathways, and byproducts of PFASs that are crucial to the design and operation of thermal treatment processes. We highlight the analytical capabilities and challenges and identify research gaps which limit the current understanding of safely applying thermal treatment to destroy PFASs as a viable end-of-life treatment process.

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“…alogVP (mmHg) = 7.97 − 0.16 × F03[C–F] − 3.16 × ACC − 0.64 × n DB.bKwan 71 .cZhang et al . 72 .dBhhatarai and Gramatica 37 .…”

Section: Evaluation Of Existing Qsar/qspr Models For Pfassmentioning

confidence: 99%

Towards higher scientific validity and regulatory acceptance of predictive models for PFAS

Sosnowska¹,

Buławska²,

Kowalska³

et al. 2023

Green Chem.

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Vapor Pressure of Nine Perfluoroalkyl Substances (PFASs) Determined Using the Knudsen Effusion Method

Cited by 25 publications

References 62 publications

Thermal Phase Transition and Rapid Degradation of Forever Chemicals (PFAS) in Spent Media Using Induction Heating

Thermal Phase Transition and Rapid Degradation of Forever Chemicals (PFAS) in Spent Media Using Induction Heating

Critical Review of Thermal Decomposition of Per- and Polyfluoroalkyl Substances: Mechanisms and Implications for Thermal Treatment Processes

Towards higher scientific validity and regulatory acceptance of predictive models for PFAS

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