Enhancing the Thermal Mineralization of Perfluorooctanesulfonate on Granular Activated Carbon Using Alkali and Alkaline-Earth Metal Additives DOI
Charbel Abou Khalil, L. V. Chernysheva, Anthony Miller

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(25), P. 11162 - 11174

Published: June 10, 2024

Thermal treatment has emerged as a promising approach for either the end-of-life or regeneration of granular activated carbon (GAC) contaminated with per- and polyfluoroalkyl substances (PFAS). However, its effectiveness been limited by requirement high temperatures, generation products incomplete destruction, necessity to scrub HF in flue gas. This study investigates use common alkali alkaline-earth metal additives enhance mineralization perfluorooctanesulfonate (PFOS) adsorbed onto GAC. When treated at 800 °C without an additive, only 49% PFOS was mineralized HF. All tested demonstrated improved mineralization, Ca(OH)2 had best performance, achieving efficiency 98% air N2. Its ability increase reaction rate shift byproduct selectivity suggests that role may be catalytic. Moreover, reduced gas instead reacting additive form inorganic fluorine (e.g., CaF2) starting waste material. A hypothesized mechanism is proposed involves electron transfer from O2– defect sites CaO intermediates formed during thermal decomposition PFOS. These findings advocate GAC disposal reuse, potential reduce operating costs mitigate environmental impact associated incinerating PFAS-laden wastes.

Language: Английский

Thermal Phase Transition and Rapid Degradation of Forever Chemicals (PFAS) in Spent Media Using Induction Heating DOI Creative Commons
Feng Xiao, Pavankumar Challa Sasi,

Ali Alinezhad

et al.

ACS ES&T Engineering, Journal Year: 2023, Volume and Issue: 3(9), P. 1370 - 1380

Published: April 26, 2023

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

Language: Английский

Citations

25
New PFASs Identified in AFFF Impacted Groundwater by Passive Sampling and Nontarget Analysis DOI
Sara Ghorbani Gorji, María José Gómez, Pradeep Dewapriya

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(3), P. 1690 - 1699

Published: Jan. 8, 2024

Monitoring contamination from per- and polyfluoroalkyl substances (PFASs) in water systems impacted by aqueous film-forming foams (AFFFs) typically addresses a few known PFAS groups. Given the diversity of PFASs present AFFFs, current analytical approaches do not comprehensively address range these systems. A suspect-screening nontarget analysis (NTA) approach was developed applied to identify novel groundwater samples contaminated historic AFFF use. total 88 were identified both passive samplers grab samples, dominated sulfonate derivatives sulfonamide-derived precursors. Several ultrashort-chain (USC) (≤C3) detected, 11 reported for first time Australian groundwater. transformation products identified, including perfluoroalkane sulfonamides (FASAs) sulfinates (PFASis). Two new (((perfluorohexyl)sulfonyl)sulfamic acid; m/z 477.9068 (E)-1,1,2,2,3,3,4,5,6,7,8,8,8-tridecafluorooct-6-ene-1-sulfonic 424.9482). This study highlights that several are overlooked using standard target analysis, therefore, potential risk all is likely be underestimated.

Language: Английский

Citations

13
Photocatalytic low-temperature defluorination of PFASs DOI
Hao Zhang, Jinxiang Chen, Jian‐Ping Qu

et al.

Nature, Journal Year: 2024, Volume and Issue: 635(8039), P. 610 - 617

Published: Nov. 20, 2024

Language: Английский

Citations

13
Near-complete destruction of PFAS in aqueous film-forming foam by integrated photo-electrochemical processes DOI
Yunqiao Guan, Zekun Liu, Nanyang Yang

et al.

Nature Water, Journal Year: 2024, Volume and Issue: 2(5), P. 443 - 452

Published: May 1, 2024

Language: Английский

Citations

12
Enhancing the Thermal Mineralization of Perfluorooctanesulfonate on Granular Activated Carbon Using Alkali and Alkaline-Earth Metal Additives DOI
Charbel Abou Khalil, L. V. Chernysheva, Anthony Miller

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(25), P. 11162 - 11174

Published: June 10, 2024

Thermal treatment has emerged as a promising approach for either the end-of-life or regeneration of granular activated carbon (GAC) contaminated with per- and polyfluoroalkyl substances (PFAS). However, its effectiveness been limited by requirement high temperatures, generation products incomplete destruction, necessity to scrub HF in flue gas. This study investigates use common alkali alkaline-earth metal additives enhance mineralization perfluorooctanesulfonate (PFOS) adsorbed onto GAC. When treated at 800 °C without an additive, only 49% PFOS was mineralized HF. All tested demonstrated improved mineralization, Ca(OH)2 had best performance, achieving efficiency 98% air N2. Its ability increase reaction rate shift byproduct selectivity suggests that role may be catalytic. Moreover, reduced gas instead reacting additive form inorganic fluorine (e.g., CaF2) starting waste material. A hypothesized mechanism is proposed involves electron transfer from O2– defect sites CaO intermediates formed during thermal decomposition PFOS. These findings advocate GAC disposal reuse, potential reduce operating costs mitigate environmental impact associated incinerating PFAS-laden wastes.

Language: Английский

Citations

12