Experimental and density functional theory investigation of surface-modified biopolymer for improved adsorption of mixtures of per- and polyfluoroalkyl substances in water

Water Research, Год журнала: 2024, Номер 255, С. 121458 - 121458

Опубликована: Март 12, 2024

Язык: Английский

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Surface Modification of Graphene Oxide for Fast Removal of Per- and Polyfluoroalkyl Substances (PFAS) Mixtures from River Water

ACS ES&T Water, Год журнала: 2024, Номер 4(7), С. 2968 - 2980

Опубликована: Июнь 11, 2024

Per- and polyfluoroalkyl substances (PFAS) make up a diverse group of industrially derived organic chemicals that are significant concern due to their detrimental effects on human health ecosystems. Although other technologies available for removing PFAS, adsorption remains viable effective method. Accordingly, the current study reported novel type graphene oxide (GO)-based adsorbent tested removal performance toward PFAS from water. Among eight adsorbents tested, GO modified by cationic surfactant, cetyltrimethylammonium chloride (CTAC), GO-CTAC was found be best, showing an almost 100% all 11 tested. The kinetics were best described pseudo-second-order model, indicating rapid adsorption. isotherm data well supported Toth suggesting onto involved complex interactions. Detailed characterization using scanning electron microscopy-energy dispersive X-ray spectroscopy, Fourier transform infrared, thermogravimetric analysis, diffraction, photoelectron spectroscopy confirmed proposed mechanisms, including electrostatic hydrophobic Interestingly, not influenced solution pH, ionic strength, or natural matter. Furthermore, efficiency at in river water demonstrated could suitable capturing real surface

Язык: Английский

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Magnetic surfactant-modified clay for enhanced adsorption of mixtures of per- and polyfluoroalkyl substances (PFAS) in snowmelt: Improving practical applicability and efficiency

Journal of Hazardous Materials, Год журнала: 2024, Номер 471, С. 134390 - 134390

Опубликована: Апрель 24, 2024

Язык: Английский

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Phosphate-enabled mechanochemical PFAS destruction for fluoride reuse

Nature, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

Abstract Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are persistent, bioaccumulative anthropogenic pollutants that have attracted the attention of public private sectors because their adverse impact on human health 1 . Although various technologies been deployed to degrade PFASs with a focus non-polymeric functionalized compounds (perfluorooctanoic acid perfluorooctanesulfonic acid) 2–4 , general PFAS destruction method coupled fluorine recovery for upcycling is highly desirable. Here we disclose protocol converts multiple classes PFAS, including fluoroplastics polytetrafluoroethylene polyvinylidene fluoride, into high-value fluorochemicals. To achieve this, were reacted potassium phosphate salts under solvent-free mechanochemical conditions, mineralization process enabling as KF K 2 PO 3 F fluorination chemistry. The can be recovered reuse, implying no detrimental phosphorus cycle. Therefore, not only destructible but now contribute sustainable circular economy.

Язык: Английский

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Surface modifications of biopolymers for removal of per- and polyfluoroalkyl substances from water: Current research and perspectives

Water Research, Год журнала: 2023, Номер 249, С. 120927 - 120927

Опубликована: Ноя. 25, 2023

Язык: Английский

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Modification of activated carbon for enhanced treatment of per‐ and polyfluoroalkyl substances: A focused review

Remediation Journal, Год журнала: 2024, Номер 34(2)

Опубликована: Фев. 1, 2024

Abstract In response to the growing concern over contamination of water sources by per‐ and polyfluoroalkyl substances (PFAS), use activated carbon (AC) for PFAS removal has garnered significant attention. However, efficient with conventional AC poses challenges due limited surface area delayed absorption kinetics. This focused review provides a concise overview latest advancements in modification AC, promising strategy enhancing adsorption. Chemical physical modifications, including deposition metal/metal oxide nanoparticles, polymer‐based coatings, surfactants, advanced oxidation processes, were explored, offering insights into their mechanisms effectiveness. The thorough analysis these modified materials valuable resource developing sustainable strategies address pressing issue sources.

Язык: Английский

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Structure and mechanism of nanoengineered membranes toward per- and polyfluoroalkyl substances (PFAS) removal from water: A critical review

Journal of Water Process Engineering, Год журнала: 2024, Номер 63, С. 105471 - 105471

Опубликована: Май 21, 2024

Язык: Английский

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Predicting full-scale performance of adsorbents for per- and polyfluoroalkyl substances adsorption: The role of rapid small-scale column tests

The Science of The Total Environment, Год журнала: 2025, Номер 974, С. 178944 - 178944

Опубликована: Март 29, 2025

Язык: Английский

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Hybrid Adsorption–Microfiltration Process for the Pretreatment of Sulfide-Containing Seawater: A Promising Strategy to Mitigate Membrane Fouling

Membranes, Год журнала: 2025, Номер 15(4), С. 100 - 100

Опубликована: Март 31, 2025

The presence of dissolved sulfides in feed seawater causes severe elemental sulfur fouling the reverse osmosis (RO) process. However, current pretreatment methods suffer from large footprint, high energy consumption, and limitations effluent quality. In this study, adsorption microfiltration are merged into a single process for sulfide-containing seawater. Powdered activated carbon (PAC) was selected its superior capacity (14.6-fold) faster kinetics (3.9-fold) sulfide removal compared to granular carbon. surface area multiple pore structures PAC facilitate intraparticle diffusion, as well anion–π conjugation likely occur between sulfide. Polypropylene microporous membranes, capable tolerating dosages, were used hybrid Long-term pilot tests demonstrated that (turbidity < 1 NTU SDI15 ≈ 2.50) met quality requirements RO unit feedwater, achieving 100% efficiency over 101 h, with no risk leakage throughout entire operation formation loose, porous cake layer alleviates membrane enhances retention metal(loid)s Moreover, low permeate flux polymeric membranes significantly mitigates filter formation. system adapts variations feedwater quality, making it highly suitable desalination plants limited space budget. These findings offer valuable insights practical guidance advancing pretreatment.

Язык: Английский

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Improving the Hydrophobicity of Powder Activated Carbon to Enhance the Adsorption Kinetics of Per- and Polyfluoroalkyl Substances

ACS ES&T Water, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Per- and polyfluoroalkyl substances (PFAS) are difficult to treat by using conventional drinking water treatment technologies. Herein, we upgrade a commercially available powder activated carbon (PAC) via an acid wash pyrolysis amplify hydrophobicity enhance PFAS adsorption. Minimal differences in overall surface area, micropore volume external area were observed between acid-washed pyrolyzed PACs. X-ray photoelectron spectroscopy, contact angle measurements, scanning electron microscopy evidenced ∼5% reduced oxygen content noticeable increases for the PAC, without altering morphology. Adsorption isotherms of perfluorooctanoic (PFOA) showed no major adsorption capacity, but more rapid kinetics PFOA perfluorobutanesulfonic (PFBS) both low high concentration tests, revealed reagent synthetic natural organic matter, with greater removal values (e.g., ∼90% vs 60%, after 1 h at 2 mg/L PFOA). PFBS behavior adhered pseudo-second-order (R = 0.843-0.992). Density functional theory calculations quantitatively evaluated energies onto graphene skeleton containing different groups, finding supportive outcomes. This work informs importance PAC.

Язык: Английский

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