Removal of per- and polyfluoroalkyl substances (PFAS) from water by ceric(<scp>iv</scp>) ammonium nitrate

Jun, Sun Hee; Jennepalli, Sreenu; Lee, Matthew; O'Carroll, D. M.; Manefield, Michael; Das, Biswanath; Kumar, Naresh

doi:10.1039/d1ra02635f

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…We are concerned more with defluorination than just reducing the PFxS concentration, so here, k is the rate constant for F – release. To obtain the electric energy consumption, the power of the 60 Co γ-rays source is estimated from the equivalent electron accelerator as eq . P = Ḋ × ρ × V η where Ḋ is the dose rate, 2.25 kGy/h (Gy: J/kg), ρ is the density of the solution, 1 kg/dm 3 , V is the volume of solution, 4 × 10 –3 dm 3 , and η is the accelerator electrical efficiency, which is around 10–40%. − P average = 2.25 × 10 3 × 1 × 4 × 10 –3 /0.25/3600 = 1 × 10 –5 kW.…”

Section: Resultsmentioning

confidence: 99%

Overlooked Activation Role of Sulfite in Accelerating Hydrated Electron Treatment of Perfluorosulfonates

Jiang,

Denisov,

Adjei

et al. 2024

Environ. Sci. Technol.

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Photoexcitation of sulfite (SO3 2–) is often used to generate hydrated electrons (eaq –) in processes to degrade perfluoroalkyl and polyfluoroalkyl substances (PFASs). Conventional consensus discourages the utilization of SO3 2– concentrations exceeding 10 mM for effective defluorination. This has hindered our understanding of SO3 2– chemistry beyond its electron photogeneration properties. In contrast, the radiation-chemical study presented here, directly producing eaq – through water radiolysis, suggests that SO3 2– plays a previously overlooked activation role in the defluorination. Quantitative 60Co gamma irradiation experiments indicate that the increased SO3 2– concentration from 0.1 to 1 M enhances the defluorination rate by a remarkable 15-fold, especially for short-chain perfluoroalkyl sulfonate (PFSA). Furthermore, during the treatment of long-chain PFSA (C8F17–SO3 –) with a higher concentration of SO3 2–, the intermediates of C8H17–SO3 – and C3F7–COO– were observed, which are absent without SO3 2–. These observations highlight that a higher concentration of SO3 2– facilitates both reaction pathways: chain shortening and H/F exchange. Pulse radiolysis measurements show that elevated SO3 2– concentrations accelerate the bimolecular reaction between eaq – and PFSA by 2 orders of magnitude. 19F NMR measurements and theoretical simulations reveal the noncovalent interactions between SO3 2– and F atoms, which exceptionally reduce the C–F bond dissociation energy by nearly 40%. As a result, our study offers a more effective strategy for degrading highly persistent PFSA contaminants.

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Section: Resultsmentioning

confidence: 99%

Overlooked Activation Role of Sulfite in Accelerating Hydrated Electron Treatment of Perfluorosulfonates

Jiang,

Denisov,

Adjei

et al. 2024

Environ. Sci. Technol.

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“…Although there are many types of PFAS, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) are the most popular (Figure 1). These two compounds contain at least six carbon-fluorine bonds and are termed long-chain C-F compounds, occurring mostly in groundwater [4] [5]. During production and use, PFAS can migrate into the soil, water, and air.…”

Section: Introductionmentioning

confidence: 99%

PFAS: Ecological Implications, Remedial Actions and Ethical Considerations

Awolesi,

Oni,

Oshinowo

et al. 2023

JACEN

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The C-F bond is one of the strongest in organic chemistry. It is responsible for the great stability of perfluoroalkyl and polyfluoroalkyl substances, commonly referred to as "PFAS", a group of man-made chemicals that include perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA). Thermal stability, surface activity, dielectric characteristics, chemical resistance, and inertness are just a few of the technical advantages that this group has over hydrocarbons, and since the 1950s, these chemicals have been largely utilized in a variety of domestic and industrial endeavors. The hydrophilic and lipophilic nature of this class of chemicals accounts for its uniqueness. Up until today, the chemistry and ecotoxicology of these chemicals continue to emerge. Issues concerning the destructive power of ignorance expedited by an ineffective regulatory institution continue to show that manufacturing chemicals are insufficient without giving serious thought to issues of openness and humanity's awareness of its own safety. When discussing the nature of humanity and how it can be defined or redefined, it is important to allude to the significance of integrating business with ethics in its various forms. This paper highlights the importance of holding polluters accountable for PFAS contamination cleanup costs while emphasizing the need for chemical manufacturers to test and disclose the health and environmental effects of PFAS compounds. In addition, the sources, types, properties, applications, distribu-

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Effective PFAS degradation by electrochemical oxidation methods-recent progress and requirement

Mirabediny

Jun

et al. 2023

Chemosphere

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Removal of per- and polyfluoroalkyl substances (PFAS) from water by ceric(iv) ammonium nitrate

Abstract: Removing per- and polyfluoroalkyl substances (PFASs) from water by ceric ammonium nitrate (CAN).

Cited by 3 publications

References 26 publications

Overlooked Activation Role of Sulfite in Accelerating Hydrated Electron Treatment of Perfluorosulfonates

Overlooked Activation Role of Sulfite in Accelerating Hydrated Electron Treatment of Perfluorosulfonates

PFAS: Ecological Implications, Remedial Actions and Ethical Considerations

Effective PFAS degradation by electrochemical oxidation methods-recent progress and requirement

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