Decomposition kinetics of perfluorinated sulfonic acids

Khan, Muhammad Yasir; So, Sui; Silva, Gabriel da

doi:10.1016/j.chemosphere.2019.124615

Cited by 69 publications

(68 citation statements)

References 46 publications

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“…Aleksandrov et al ( 2019 ) conducted thermogravimetric analyses (TGA) of PTFE that exhibited complete destruction in <1 s at 800°C, similar to SSI temperature regimes. Khan et al ( 2020 ) calculated a PFOS half‐life of 0.2 s at 726°C. MacGregor ( 2020 ) reported PFAS is being destroyed through an FBF SSI (830°C for 8 s) based on mass flows into and out of the incineration system though the stack emissions have yet to be characterized.…”

Section: Prospective Ssi Pfas Fatementioning

confidence: 99%

Per‐ and polyfluoroalkyl substances thermal destruction at water resource recovery facilities: A state of the science review

Winchell

Ross

Wells

et al. 2020

Water Environment Research

113

104

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Per‐ and polyfluoroalkyl substances (PFAS) are a recalcitrant group of chemicals and can be found throughout the environment. They often collect in wastewater systems with virtually no degradation prior to environmental discharge. Some PFAS partitions to solids captured in wastewater treatment which require further processing. Of all the commonly applied solids treatment technologies, incineration offers the only possibility to completely destroy PFAS. Little is known about the fate of PFAS through incineration, in particular, for the systems employed in water resource recovery facilities (WRRF). This review covers available research on the fate of PFAS through incineration systems with a focus on sewage sludge incinerators. This research indicates that at least some PFAS destruction will occur with incineration approaches used at WRRFs. Furthermore, PFAS in flue gas, ash, or water streams used for incinerator pollution control may be undetectable. Future research involving full‐scale fate studies will provide insight on the efficacy of PFAS destruction through incineration and whether other compounds of concern are generated. Practitioner points Thermal processing is the only commercial approach available to destroy PFAS. Thermal degradation conditions required for destruction of PFAS during incineration processes are discussed. Fate of PFAS through water resource recovery facility incineration technologies remains unclear. Other thermal technologies such as smoldering combustion, pyrolysis, gasification, and hydrothermal liquefaction provide promise but are in developmental phases.

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Section: Prospective Ssi Pfas Fatementioning

confidence: 99%

Per‐ and polyfluoroalkyl substances thermal destruction at water resource recovery facilities: A state of the science review

Winchell

Ross

Wells

et al. 2020

Water Environment Research

113

104

View full text Add to dashboard Cite

show abstract

“…The predicted half-life for the thermal decomposition of PFOS is less than 1 s at 727 C based on computational chemistry (Khan et al, 2020 short half-lives at high temperatures (>500 C) (Ge et al, 2014;Xiao et al, 2020). Based on the combustion tube volume and typical TOC carrier gas flow rate (150 ml/ min), the gas retention time in the combustion tube is about 20 s (volume of packing material not considered).…”

Section: Carrier Gas Flow Ratementioning

confidence: 99%

Quantification of per‐ and polyfluoroalkyl substances with a modified total organic carbon analyzer and ion chromatography

et al. 2021

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Quantification of per-and polyfluoroalkyl substances (PFAS) via mass spectrometry is highly sensitive but targets a limited number of compounds and the instrumentation is not available in many laboratories. We developed a methodology to determine total organofluorine by modifying a total organic carbon analyzer, which is common in laboratories across disciplines. Evolved hydrogen fluoride was captured in an impinger and analyzed by ion chromatography. Recovery of fluorine from 20 PFAS was dependent on terminal functional group and alkyl chain length. The method detection limit based on perfluorooctanoic acid (PFOA) spiked samples was 36 μg-F/L (52 μg PFOA/L). Fluorine recoveries of spiked PFAS in river water and wastewater were similar to those spiked in deionized water. The recovery of inorganic fluorine present in sodium fluoride was 91%. Therefore, researchers should be cautious when applying methods that pre-combust samples to differentiate organoand inorganic fluorine, because the combustion process may cause inadvertent losses of inorganic fluorine, resulting in an overestimation of organofluorine.

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“…Breaking these bonds requires a significantly higher amount of energy than used for the chemical degradation of chlorinated (

= 323 kJ/mol) and brominated (

= 269 kJ/mol) organic pollutants [ 58 ]. To lower the required energy amount, the use of catalytically active materials can be advisable [ 59 , 60 , 61 ]. The latest developments of advanced oxidation processes (AOPs), including chemical oxidation (e.g., persulfate oxidation, ozonation), photooxidation, electrochemical or thermal oxidation, have been recently reviewed by several authors [ 62 , 63 , 64 , 65 ].…”

Section: State-of-the-art Liquid Reactionsmentioning

confidence: 99%

Reductive Defluorination and Mechanochemical Decomposition of Per- and Polyfluoroalkyl Substances (PFASs): From Present Knowledge to Future Remediation Concepts

Roesch

Vogel

Simon

2020

IJERPH

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Over the past two decades, per- and polyfluoroalkyl substances (PFASs) have emerged as worldwide environmental contaminants, calling out for sophisticated treatment, decomposition and remediation strategies. In order to mineralize PFAS pollutants, the incineration of contaminated material is a state-of-the-art process, but more cost-effective and sustainable technologies are inevitable for the future. Within this review, various methods for the reductive defluorination of PFASs were inspected. In addition to this, the role of mechanochemistry is highlighted with regard to its major potential in reductive defluorination reactions and degradation of pollutants. In order to get a comprehensive understanding of the involved reactions, their mechanistic pathways are pointed out. Comparisons between existing PFAS decomposition reactions and reductive approaches are discussed in detail, regarding their applicability in possible remediation processes. This article provides a solid overview of the most recent research methods and offers guidelines for future research directions.

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Decomposition kinetics of perfluorinated sulfonic acids

Cited by 69 publications

References 46 publications

Per‐ and polyfluoroalkyl substances thermal destruction at water resource recovery facilities: A state of the science review

Per‐ and polyfluoroalkyl substances thermal destruction at water resource recovery facilities: A state of the science review

Quantification of per‐ and polyfluoroalkyl substances with a modified total organic carbon analyzer and ion chromatography

Reductive Defluorination and Mechanochemical Decomposition of Per- and Polyfluoroalkyl Substances (PFASs): From Present Knowledge to Future Remediation Concepts

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