Challenges in PFAS Postdegradation Analysis: Insights from the PFAS-CTAB Model System

ACS Measurement Science Au, Journal Year: 2025, Volume and Issue: 5(1), P. 135 - 144

Published: Jan. 22, 2025

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals widely used for their oil water-repellent properties. Their environmental persistence potential health risks have raised significant concerns. As PFAS degrades through remediation or natural processes, they form complex mixtures of the original chemicals, transformation byproducts, degradation additives. Analyzing after presents analytical challenges due to possible chemical physical interactions, including ion pairing, micelle formation, complexation. These factors can significantly impact precision accuracy measurements, yet often overlooked in studies. In this work, we demonstrate that with addition ppb-level cetyltrimethylammonium bromide (CTAB), a cationic surfactant plasma-based degradation, calibration curve linearity, sensitivity, reproducibility severely compromised. Isotopically labeled internal standards cannot fully correct these issues. Furthermore, standard EPA methods 537.1, 533, 1633 could not accurately recover concentrations CTAB mixtures, severe matrix effects observed longer-chain nitrogen-containing PFAS. Among methods, Method is currently most suitable option postdegradation analysis. showed lowest interference because method another weak pair additive, formic acid acetic (in commercial lab analysis), acidify sample before LC-MS/MS analysis added an isotopically standard. For future studies, recommend systematically evaluating effect on quantification using recovery validate use.

Language: Английский

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Promoting C–F Bond Activation for Perfluorinated Compounds Decomposition via Atomically Synergistic Lewis and Brønsted Acid Sites

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: 147(9), P. 7391 - 7399

Published: Feb. 19, 2025

Catalytic hydrolysis is a sustainable method for the degradation of perfluorinated compounds (PFCs) but challenged by high reaction temperatures required to cleave strong C–F bonds. Herein, we developed an innovative activation strategy constructing synergistic Lewis and Brønsted acid pairs over atomically dispersed Zn–O–Al sites promote bond decomposition typical PFCs, CF4. Density functional theory (DFT) calculations demonstrate tricoordinated Al (AlIII) Zn–OH functional, respectively, as Zn–O–Al, synergistically enhancing adsorption X-ray absorption spectroscopy (XAS), pyridine infrared (Py-IR), ammonia temperature-programmed desorption (NH3-TPD) verified presence both AlIII on sites. CF4-TPD in situ confirmed that facilitate CF4 activation. As result, with achieved 100% at low temperature 560 °C demonstrated outstanding stability more than 250 h.

Language: Английский

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Insight into the Photocatalytic Degradation Mechanism for “Forever Chemicals” PFNA by Reduced Graphene Oxide/WO₃ Nanoflower Heterostructures

ACS Omega, Journal Year: 2025, Volume and Issue: 10(10), P. 10675 - 10684

Published: March 4, 2025

Water contamination with "forever chemicals" like per- and polyfluoroalkyl substances (PFAS) poses significant toxicity to the environment. Since they are most persistent synthetic chemicals that hardly degrade in natural environment carcinogenic humans, there is an urgent need discover novel processes for destroying PFAS. Herein, we report on design of a reduced graphene oxide (r-GO)/WO3 nanoflower (WO3-NF)-based heterostructure harnessing 365 nm light-driven photocatalytic oxidation reduction process toward degradation perfluorononanoic acid (PFNA). Moreover, reported data reveal using r-GO/WO3-NF photocatalyst, 100% PFNA 14% defluorination can be achieved presence isopropyl alcohol as hydroxy radical (•OH) quencher or glucose hot hole (h+) after exposure light 22 h. A mechanistic study shows synergistic vital complete PFNA, where hydrated electron (eaq -) plays key role reducing agent h+ •OH act agents. Furthermore, destruction mechanism indicates chain shortening via C-C bond breaking C-F major pathways degradation. wavelength-dependent only 22% 532 h, which due lack formation electrons -). The current sheds construction r-GO/WO3 NF heterojunction highly efficient

Language: Английский

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Opportunity and Challenge of Advanced Porous Sorbents for PFAS Removal

ChemSusChem, Journal Year: 2024, Volume and Issue: unknown

Published: July 22, 2024

Abstract Per‐ and polyfluoroalkyl substances (PFASs), comprising over 9,000 persistent synthetic organic contaminants, are extensively found in the environment pose significant risks to both human ecological health. Among strategies for addressing PFAS contamination, adsorption processes have proven be cost‐effective. Traditional sorbents such as ion‐exchange resins activated carbon been exhibit low capacities slow equilibration times. Recent innovations porous materials, including metal‐organic frameworks (MOFs), covalent (COFs), polymers (POPs), however, offer improvements efficiency of adsorption. This review thoroughly examines latest advancements these analyzing their mechanisms adsorption, concludes by suggesting directions future research that could further enhance effectiveness management.

Language: Английский

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Copper-Based Two-Dimensional Conductive Metal–Organic Framework Thin Films for Ultrasensitive Detection of Perfluoroalkyls in Drinking Water

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 8, 2025

Perfluoroalkyls (PFAS) continue to emerge as a global health threat making their effective detection and capture extremely important. Though metal-organic frameworks (MOFs) have stood out promising class of porous materials for sensing PFAS, limits remain insufficient fundamental understanding mechanisms warrants further investigation. Here, we show the use 2D conductive MOF film based on copper hexahydroxy triphenylene (Cu-HHTP) fabricate chemiresistive devices detecting PFAS in drinking water. We ultrasensitive using electrochemical impedance spectroscopy. Owing excellent electrostatic attractions interactions between copper-based confirmed by high-resolution spectroscopy theoretical simulations, MOF-based sensor reported herein exhibits affinity sensitivity toward perfluorinated acids at concentrations low 0.002 ng/L.

Language: Английский

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Electrocatalytic nanocomposite flow-through porous electrodes with sputter-coated Cu/Co nanoparticles for degradation of waterborne perfluorooctanoic acid

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132539 - 132539

Published: March 1, 2025

Language: Английский

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Advances in PFAS Electrochemical Reduction: Mechanisms, Materials, and Future Perspectives

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 491, P. 137943 - 137943

Published: March 16, 2025

Language: Английский

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A Self-Respiring Cathode Weaken the Competing Reactions of Electro-Fenton Synergistic Pms-Activated Systems for Activation of Dual Oxidants: Coupling System Powers Centralized Active Reaction Zone of Pfoa

Published: Jan. 1, 2025

Language: Английский

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Organic Electrochemical Transistors with Molecularly Imprinted Polymer Electrodes for Rapid Detection of Perfluorooctanoic Acid

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants linked to adverse health effects, there is a need for sensors that can detect PFAS in challenging environments. Electrochemical offer significant potential achieving cost-effective, rapid, real-time detection of PFAS, particularly comparison current techniques, which rely on costly chromatographic methods. Here, we report organic electrochemical transistors (OECTs) containing molecularly imprinted polymer (MIP) gate electrode selectively perfluorooctanoic acid (PFOA) seawater. We prepared polyaniline (PANI) by polymerizing aniline onto filter paper the presence PFOA, followed rinsing remove PFOA. When used as an device (OECT), PFOA produced measurable change OECT source-drain due adsorption electrode, reduced capacitance increased impedance. Other molecules weak or no response. Specifically, show responds strongly but only weakly perfluoropropionic (PFPrA), perfluorohexanoic (PFHxA), surfactant 4-dodecylbenzenesulfonic (DBSA). The also able mixtures these other surfactants. achieved limit 1.6 parts per trillion (ppt) 3.86 × 10-12 M, below regulatory advisory level 70 ppt set United States Environmental Protection Agency This work demonstrates low-cost capable rapid specific potentially lead monitoring concentrations seawater

Language: Английский

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Enhanced photocatalytic defluorination of perfluorooctanoic acid through integrated hydrogen atoms/electrons reduction and ROS oxidation with metal–organic framework heterogeneous catalysts

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163058 - 163058

Published: April 1, 2025

Language: Английский

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