Electrochemical destruction and mobilization of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in saturated soil

Hou, Jie; Li, Guoao; Liu, Mingrui; Chen, Liang; Yao, Ye; Fallgren, Paul H.; Jin, Song

doi:10.1016/j.chemosphere.2021.132205

Cited by 32 publications

(16 citation statements)

References 48 publications

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“…Because there is little preference among the C 2 − C 7 , a mixture of species at the end of the electrocatalytic process is expected. The above is consistent with the 19 F − 1 H NMR data because it shows that at least three monohydrogenated carbon chains are present after 14 h of bulk electrolysis.…”

supporting

confidence: 91%

“…The PFOA and the working solution were analyzed in a Bruker Advance III 400 MHz NMR Spectrometer. 19 F NMR spectrum was acquired using 500 scans with a recycle delay of 30 s. Hexafluorobenzene (HFB) was used as the external standard at −164.9 ppm, 34 and the spectra obtained were referenced to this signal. In a 5 mm glass NMR tube, 200 μL of 1 mM PFOA, 10 μL of HFB, and 100 μL of deuterium oxide (D 2 O) were added as a signal locking solvent.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

Calvillo Solís,

Sandoval-Pauker,

Bai

et al. 2024

J. Am. Chem. Soc.

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Perfluorooctanoic acid (PFOA) is an artificial chemical of global concern due to its high environmental persistence and potential human health risk. Electrochemical methods are promising technologies for water treatment because they are efficient, cheap, and scalable. The electrochemical reduction of PFOA is one of the current methodologies. This process leads to defluorination of the carbon chain to hydrogenated products. Here, we describe a mechanistic study of the electrochemical reduction of PFOA in gold electrodes. By using linear sweep voltammetry (LSV), an E 0 ′ of −1.80 V vs Ag/AgCl was estimated. Using a scan rate diagnosis, we determined an electrontransfer coefficient (α exp ) of 0.37, corresponding to a concerted mechanism. The strong adsorption of PFOA into the gold surface is confirmed by the Langmuir-like isotherm in the absence (K A = 1.89 × 10 12 cm 3 mol −1 ) and presence of a negative potential (K A = 3.94 × 10 7 cm 3 mol −1 , at −1.40 V vs Ag/AgCl). Based on Marcus−Hush's theory, calculations show a solvent reorganization energy (λ 0 ) of 0.9 eV, suggesting a large electrostatic repulsion between the perfluorinated chain and water. The estimated free energy of the transition state of the electron transfer (ΔG ‡ = 2.42 eV) suggests that it is thermodynamically the reaction-limiting step. 19 F − 1 H NMR, UV−vis, and mass spectrometry studies confirm the displacement of fluorine atoms by hydrogen. Density functional theory (DFT) calculations also support the concerted mechanism for the reductive defluorination of PFOA, in agreement with the experimental values.

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supporting

confidence: 91%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

Calvillo Solís,

Sandoval-Pauker,

Bai

et al. 2024

J. Am. Chem. Soc.

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“…69 The results may also be applied to soil where GAC has been added to immobilize or stabilize PFAS to treat PFAS in situ , in a similar manner to that demonstrated in previous studies. 70 This would dispense the need to remove copious amounts of soil to mineralize sorbed PFAS. 69 It is appreciated, however, that soils are complex systems with potential competing dissolved species, and therefore the efficacy and feasibility of such an electrochemical system to mineralize PFAS under field conditions would need to be investigated.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical degradation of a C6-perfluoroalkyl substance (PFAS) using a simple activated carbon cathode

Ackerman Grunfeld,

Jones,

Sun

et al. 2024

Environ. Sci.: Water Res. Technol.

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“…Its outstanding chemical and physical properties, including hydrophobicity, oleophobicity, and extraordinary chemical stability (Gong et al, 2016;Li et al, 2012;Loos et al, 2008), has led to its widespread use in polymerization aids (Yao et al, 2013), fast-food containers, water-resistant clothing, aqueous re-ghting foams, painting materials, stain-resistant carpeting, surfactant, lubricants, wetting agents (Liu et al, 2021;Paul et al, 2009). Therefore PFOA can come from a variety of sources, including aqueous lm-forming foams (Hodgkins et al, 2019;Houtz et al, 2013;Turner et al, 2021), land ll of PFOAs-containing wastes (Sepulvado et al, 2011), water and wastewater treatment plant sludge, biosolids or composts on agricultural lands (Jho et al, 2015;Röhler et al, 2021;Zhu et al, 2022), atmospheric wet deposition and manufacturing industries (Hou et al, 2022;Kewalramani et al, 2022; ).…”

Section: Introductionmentioning

confidence: 99%

Selecting sustainable approach for remediation of PFOA contaminated soils: AHP decision-making

Soltanian,

Salmak,

Baghdadi

et al. 2023

Preprint

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Perfluorooctanoic acid (PFOA), which is an emerging persistent organic and one of the most commonly used PFAS, has a wide range of applications in industrial and production processes, and humans can regularly be exposed to it, so remediation of PFOA-contaminated soil is of great importance. This research presents the importance of PFOA soil pollution, soil remediation related technologies, their mechanisms and the order of remediation priority for three different hypothetical scenarios. Our comprehensive literature review shows that while some remediation methods have shown positive results, some, such as ultrasound, are ineffective in terrestrial ecosystems. Despite the fact that generally, the selection of a practical and compelling soil remediation technique depends on site assessments, our investigation and analysis by implementing an analytical hierarchy process and considering remediation time, environmental impacts, ecological impact, soil disturbance, post management, etc. as criteria, leads to the solidification/stabilization, oxidation, electrokinetic, phytoremediation and bioremediation as the most feasible and promising approaches for remediation of PFOA contaminated sites in our three suggested scenarios, but with different preferences. On the other hand, negative aspects of the electron beam, pulsed corona, and ball milling have placed them at the bottom of our selection list for field scale remediation.

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Electrochemical destruction and mobilization of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in saturated soil

Cited by 32 publications

References 48 publications

Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

Electrochemical degradation of a C6-perfluoroalkyl substance (PFAS) using a simple activated carbon cathode

Selecting sustainable approach for remediation of PFOA contaminated soils: AHP decision-making

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