Heavy-Metal Ions Control on PFAS Adsorption on Goethite in Aquatic Systems

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(45), P. 20235 - 20244

Published: Oct. 31, 2024

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous environmental contaminants that often co-occur with heavy metals. Despite their prevalence, the mobility of PFAS in complex, multicomponent systems, particularly at molecular scale, remains poorly understood. The vast diversity low concentrations alongside anthropogenic natural underscore need for integrating mechanistic insights into sorption models. This study explores influence metal cations (Cu(II), Cd(II), Fe(II)) on adsorption four common (PFOA, PFOS, PFDA, GenX) onto goethite (α-FeOOH), a iron (oxyhydr)oxide both aquatic terrestrial environments. was highly dependent type, pH, ion concentration, surface complexation model effectively predicting these interactions. Cu(II) Cd(II) enhanced PFOS PFDA via ternary while slightly reducing PFOA GenX adsorption. Under anoxic conditions, Fe(II) significantly increased all PFAS, showing reactivity greater than those Cd(II). Additionally, organic matter mobility, although groundwater may counteract this by enhancing retention. These findings highlight key role transport offer critical behavior oxic-anoxic interfaces.

Language: Английский

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Nexus of Soil Microbiomes, Genes, Classes of Carbon Substrates, and Biotransformation of Fluorotelomer-Based Precursors

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(46), P. 20553 - 20565

Published: Nov. 6, 2024

The unpredictable biodegradation of fluorotelomer (FT)-based per- and polyfluoroalkyl substances (PFAS) causes complicated risk management PFAS-impacted sites. Here, we have successfully used redundancy analysis to link FT-based precursor key microbes genes soil microbiomes shaped by different classes carbon sources: alcohols (C2–C4), alkanes (C6 C8), an aromatic compound (phenol), or a hydrocarbon surfactant (cocamidopropyl betaine [CPB]). All the enrichments defluorinated (n:2 FtOH; n = 4, 6, 8) effectively grew on 6:2 sulfonate (6:2 FtS) as sulfur source. butanol-enriched culture showed highest defluorination extent for FtOHs FtS due high microbial diversity abundance desulfonating defluorinating genes. CPB-enriched accumulated more 5:3 carboxylic acid, suggesting unique roles Variovorax Pseudomonas. Enhanced FtOH was observed synergism between two with source except those phenol- cultures. While sulfonamidoalkyl not degraded, trace levels amines were detected. identified species involved in desulfonation, defluorination, metabolism are promising biomarkers assessing degradation at

Language: Английский

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Remediation of PFAS-impacted soils using magnetic activated carbon (MAC) and hydrothermal alkaline treatment (HALT)

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168931 - 168931

Published: Dec. 1, 2023

Language: Английский

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Influence of kinetic air-water interfacial partitioning on unsaturated transport of PFAS in sandy soils

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 957, P. 177420 - 177420

Published: Nov. 20, 2024

This study investigates the impact of kinetic air-water partitioning on transport perfluoroalkyl substances (PFAS) within homogeneous and heterogeneous sandy vadose zones under transient unsaturated flow conditions. These experimental conditions are realistic for field behavior, where foments continual growth collapse interfaces (AWIs), layered heterogenous enhance perturbations AWIs. Short-chain PFAS behave like conservative tracers with negligible interface partitioning, whereas longer-chain demonstrate non-equilibrium retention especially in media. AWI kinetics were found to be important controlling mass flux, particularly during sorption interface, which results because different nature more rapid changes drainage, wherein moving toward achieve equilibrium, than imbibition, leaving equilibrium. Neglecting these processes can result an underestimate velocities flux reaching water table. The presence trapped air may also inhibit a similar manner by causing longer diffusion paths from bulk portion modified HYDRUS effectively captured provided excellent match measured breakthrough curves. To assess relevance using infiltration rates, simulations conducted precipitation data actual site. showed that accounting increases cumulative PFOS groundwater factor 2.3 compared equilibrium conditions, significantly impacting porewater concentrations. difference was threefold suggesting importance effects vary over long term climatic or soil types, due their strong dependence flux.

Language: Английский

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Research progress on the transportation of poly- and perfluoroalkyl substances (PFASs) in freshwater based on CiteSpace

Blue-Green Systems, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 9, 2024

Abstract Poly- and perfluoroalkyl substances (PFASs) have garnered extensive attention due to their dissolubility, stability, hydrophobicity, oleophobicity, contributing long-range transport of PFASs in the water. As an important part blue-green space system, freshwater plays a decisive role ensuring environmental health. Hence, comprehensive analysis current studies regarding transportation is highly for ecotoxicological assessment pollution control. To explore research progress hotspots freshwater, CiteSpace software was utilized this literature conduct publication growth, countries/regionss, publishing institutions, co-citation analysis, keywords bursting timeline analysis. The trends were divided into embryonic period (2005–2014) developing (2015–2023). Institutions authors from China found publish most literature, indicating places significant emphasis on risks environments. Research shifted behaviors mechanisms risk multimedia transportation. Understanding crucial assessing impacts, water resource sustainability, development management practices prioritizing energy efficiency, responsibility.

Language: Английский

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