Comparative investigation of PFAS adsorption onto activated carbon and anion exchange resins during long-term operation of a pilot treatment plant

Water Research, Год журнала: 2022, Номер 226, С. 119198 - 119198

Опубликована: Окт. 4, 2022

Язык: Английский

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A Review on Removal and Destruction of Per- and Polyfluoroalkyl Substances (PFAS) by Novel Membranes

Membranes, Год журнала: 2022, Номер 12(7), С. 662 - 662

Опубликована: Июнь 27, 2022

Per- and Polyfluoroalkyl Substances (PFAS) are anthropogenic chemicals consisting of thousands individual species. PFAS consists a fully or partly fluorinated carbon-fluorine bond, which is hard to break requires high amount energy (536 kJ/mole). Resulting from their unique hydrophobic/oleophobic nature chemical mechanical stability, they highly resistant thermal, chemical, biological degradation. have been used extensively worldwide since the 1940s in various products such as non-stick household items, food-packaging, cosmetics, electronics, firefighting foams. Exposure may lead health issues hormonal imbalances, compromised immune system, cancer, fertility disorders, adverse effects on fetal growth learning ability children. To date, very few novel membrane approaches reported effective removing destroying PFAS. Therefore, this article provides critical review treatment removal by separation systems. We discuss recently techniques for include detailed discussion parameters affecting destruction. Moreover, an estimation cost analysis also included each technology. Additionally, technology still growing, we incorporated several future directions efficient treatment.

Язык: Английский

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Reactive Nitrogen Species Generated by Gas–Liquid Dielectric Barrier Discharge for Efficient Degradation of Perfluorooctanoic Acid from Water

Environmental Science & Technology, Год журнала: 2021, Номер 56(1), С. 349 - 360

Опубликована: Дек. 22, 2021

Perfluorooctanoic acid (PFOA) poses a serious threat to the ecological environment and biological health because of its ubiquitous distribution, extreme persistence, high toxicity. In this study, we designed novel gas-liquid dielectric barrier discharge (GLDBD) reactor which could efficiently destruct PFOA. PFOA removal efficiencies can be obtained in various water matrices, were higher than 98.0% within 50 min, with energy yields 114.5 mg·kWh-1. It was confirmed that reactive species including e-, ONOOH, •NO2, hydroxyl radicals (•OH) responsible for removal. Especially, study first revealed crucial role nitrogen (RNS) degradation plasma system. Due generation large amount RNS, GLDBD proved less sensitive meant broader promising practical application. Moreover, influential factors concentration ions humic (HA), investigated. The possible pathways proposed based on liquid chromatograph-mass spectrometer (LC-MS) results density functional theory (DFT) calculation, further feasibility RNS. This research, therefore, provides an effective versatile alternative from matrices.

Язык: Английский

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Electrochemical remediation of perfluoroalkyl substances from water

Electrochimica Acta, Год журнала: 2021, Номер 403, С. 139635 - 139635

Опубликована: Ноя. 24, 2021

Язык: Английский

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XGBoost model as an efficient machine learning approach for PFAS removal: Effects of material characteristics and operation conditions

Environmental Research, Год журнала: 2022, Номер 215, С. 114286 - 114286

Опубликована: Сен. 9, 2022

Язык: Английский

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Synthesis and characterization of PCN-222 metal organic framework and its application for removing perfluorooctane sulfonate from water

Journal of Colloid and Interface Science, Год журнала: 2023, Номер 636, С. 459 - 469

Опубликована: Янв. 8, 2023

Poly- and perfluoro alkyl substances (PFAS) are a group of man-made, notoriously persistent, highly toxic contaminants in the environment reported worldwide. Many adsorbents including granular activated carbon, graphene, biochar, zeolites, clay minerals have been tested for PFAS removal from water, but most these materials suffer high cost and/or poor performance. Here, we synthesized, characterized, examined efficiency PCN-222(Fe), new porous metal organic framework (MOF) with water stability, adsorptive frequently occurring PFAS, perfluorooctane sulfonate (PFOS), water. The adsorption isotherm kinetic studies revealed PFOS capacity PCN-222 (2257 mg/g), rapid rate (within 30 min). structure was unaffected pH range 2-10 disintegrated lost its ability at > 10. on an endothermic reaction. Electrostatic attraction dominant mechanism < 1694 mg/g concentration, while hydrophobic interaction accompanied hydrogen-bonding responsible ≥ concentration. interlayer morphology did not change due to increasing loading. findings this study demonstrated superior features over other conventional potential application removing contaminated reduce transfer living organisms.

Язык: Английский

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Effects of water matrix on per- and poly-fluoroalkyl substances (PFAS) treatment: Physical-separation and degradation processes – A review

Journal of Hazardous Materials Advances, Год журнала: 2023, Номер 10, С. 100322 - 100322

Опубликована: Май 1, 2023

Per- and poly-fluoroalkyl substances (PFAS) have emerged as contaminants of great concern that are ubiquitously detected in natural aquatic environments. Strict health advisories regulations triggered development several treatment processes to remove or degrade PFAS. However, the main challenge affects implementation both physical-separation degradation real world applications is quality water be treated. Organic inorganic constituents, defining quality, accompany PFAS influent processes. Thus, this article aims provide a detailed review impacts such constituents on (i.e., carbon-based, natural, synthetic adsorbents, ion-exchange resins, membranes) sonolysis, photochemical, electrochemical, heat-activated persulfate, plasma-based treatment, ionizing radiation) Depending mechanisms, solutes shown inhibitory, promotive, neutral effects treatment. This elucidates matrix largely dependent (1) organic matters characteristics (e.g., molecular weight, aromaticity, functional groups), (2) operational parameters type resin, anode material, surface charge solution pH), (3) properties chain length group). The information data presented here beneficial from theoretical practical perspectives for degradation.

Язык: Английский

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Is sorption technology fit for the removal of persistent and mobile organic contaminants from water?

The Science of The Total Environment, Год журнала: 2023, Номер 880, С. 163343 - 163343

Опубликована: Апрель 6, 2023

Persistent, Mobile, and Toxic (PMT) very persistent mobile (vPvM) substances are a growing threat to water security safety. Many of these distinctively different from other more traditional contaminants in terms their charge, polarity, aromaticity. This results sorption affinities towards sorbents such as activated carbon. Additionally, an increasing awareness on the environmental impact carbon footprint technologies puts some energy-intensive practices treatment into question. Commonly used approaches may thus need be readjusted become fit for purpose remove challenging PMT vPvM substances, including example short chained per- polyfluoroalkyl (PFAS). We here critically review interactions that drive organic compounds related sorbent materials identify opportunities limitations tailoring removal. Other less materials, ion exchange resins, modified cyclodextrins, zeolites metal-organic frameworks then discussed potential alternative or complementary use scenarios. Sorbent regeneration evaluated potential, considering reusability, on-site regeneration, local production. In this context, we also discuss benefits coupling destructive separation technologies. Finally, sketch out possible future trends evolution removal water.

Язык: Английский

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PFAS adsorbent selection: The role of adsorbent use rate, water quality, and cost

Journal of Hazardous Materials, Год журнала: 2023, Номер 454, С. 131481 - 131481

Опубликована: Апрель 26, 2023

Язык: Английский

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Experimental investigations of Per- and Poly-fluoroalkyl substances (PFAS) degradation by non-thermal plasma in aqueous solutions

Journal of environmental chemical engineering, Год журнала: 2023, Номер 11(6), С. 111588 - 111588

Опубликована: Ноя. 29, 2023

The treatability of perfluorocarboxylic acids (PFCA) (perfluorobutanoic acid (PFBA), perfluorohexanoic (PFHxA), perfluorooctanoic (PFOA) and perfluorodecanoic (PFDA)) perfluorosulfonic (PFSA) (PFBS, Perfluorooctanesulfonic PFHxS (PFOS)) via a bubble column with non-thermal plasma discharges in the argon headspace were investigated individual solutions from surface water sourced contaminated site. High degradation (>90%) could be achieved for PFOA, PFOS within 40 min treating water. Overall, correlated length perfluorinated carbon chain, decrease associated reduction backbone. Experiments prepared PFAS at initial concentrations 10, 25 50 μg/L found higher PFCA PFSA faster rates suggesting treatment efficiency was limited by mass transfer PFAS. Negligible breakdown observed PFBA any trialled, indicating limitations when more hydrophilic PFAS, which may require combining this approach polishing step, such as nanofiltration.

Язык: Английский

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