Multiple interactions steered high affinity toward PFAS on ultrathin layered rare-earth hydroxide nanosheets: Remediation performance and molecular-level insights

Tan, Xianjun; Jiang, Zhenying; Ding, Wenhui; Zhang, Mingkun; Huang, Yuxiong

doi:10.1016/j.watres.2022.119558

Cited by 10 publications

(6 citation statements)

References 44 publications

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“…For instance, the removal efficiency of AC for PFASs in drinking water dropped sharply from ~80% (long-chain) to ~40% (short-chain), and short-chain PFASs escaped rapidly from actual adsorption devices ( 13 , 14 ). To date, a restricted number of publications have addressed short-chain PFAS adsorption via using novel adsorption materials (e.g., β-cyclodextrin polymer, covalent organic frameworks, and magnetic fluorinated polymer), but these schemes achieved only marginal efficiency gains over AC and cannot be implemented currently due to unsuitable for existing facilities ( 15 – 19 ). Hence, this study focuses on improving the adsorption affinity of AC and in situ upgrading the existing adsorption devices toward solving the short-chain PFAS crisis.…”

mentioning

confidence: 99%

Confined water–encapsulated activated carbon for capturing short-chain perfluoroalkyl and polyfluoroalkyl substances from drinking water

Shi

You

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The global ecological crisis of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in drinking water has gradually shifted from long-chain to short-chain PFASs; however, the widespread established PFAS adsorption technology cannot cope with the impact of such hydrophilic pollutants given the inherent defects of solid–liquid mass transfer. Herein, we describe a reagent-free and low-cost strategy to reduce the energy state of short-chain PFASs in hydrophobic nanopores by employing an in situ constructed confined water structure in activated carbon (AC). Through direct (driving force) and indirect (assisted slip) effects, the confined water introduced a dual-drive mode in the confined water–encapsulated activated carbon (CW-AC) and completely eliminated the mass transfer barrier (3.27 to 5.66 kcal/mol), which caused the CW-AC to exhibit the highest adsorption capacity for various short-chain PFASs (C-F number: 3-6) among parent AC and other adsorbents reported. Meanwhile, benefiting from the chain length– and functional group–dependent confined water–binding pattern, the affinity of the CW-AC surpassed the traditional hydrophobicity dominance and shifted toward hydrophilic short-chain PFASs that easily escaped treatment. Importantly, the ability of CW-AC functionality to directly transfer to existing adsorption devices was verified, which could treat 21,000 bed volumes of environment-related high-load (~350 ng/L short-chain PFAS each) real drinking water to below the World Health Organization’s standard. Overall, our results provide a green and cost-effective in situ upgrade scheme for existing adsorption devices to address the short-chain PFAS crisis.

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confidence: 99%

Confined water–encapsulated activated carbon for capturing short-chain perfluoroalkyl and polyfluoroalkyl substances from drinking water

Shi

You

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…Degradation of PFDA via microorganisms under this process conditions is quite difficult [ 66 ], therefore, its removal was attributed to adsorption process in hydrogels. The adsorption of PFAS, considered as an effective remediation technique [ 67 ], has been primarily attributed to hydrogen bonds between an absorbent and the hydrophilic group of PFAS [ 68 ]. In our experiment, either polymeric matrix or AC can perform hydrogen bonds.…”

Section: Discussionmentioning

confidence: 99%

Influence of PFDA on the nutrient removal from wastewater by hydrogels containing microalgae-bacteria

Morán-Valencia

Huerta-Aguilar

Mora

et al. 2023

Heliyon

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“…Due to their robust chemical and thermal properties, per- and polyfluoroalkyl substances (PFAS) have been utilized in numerous applications such as coatings, textiles, adhesives, cosmetics, food packaging, and aqueous film-forming foams. , PFAS are characterized by the presence of both a polar head and a hydrophobic tail that contain high energy C–F bonds (544 kJ/mol) within their molecular structures . This molecular framework contributes to PFAS’ high water solubility and exceptional environmental persistence, leading to their classification as “forever chemicals”.…”

Section: Introductionmentioning

confidence: 99%

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

Pervez,

Jiang,

Mahato

et al. 2024

ACS EST Water

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

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Multiple interactions steered high affinity toward PFAS on ultrathin layered rare-earth hydroxide nanosheets: Remediation performance and molecular-level insights

Cited by 10 publications

References 44 publications

Confined water–encapsulated activated carbon for capturing short-chain perfluoroalkyl and polyfluoroalkyl substances from drinking water

Confined water–encapsulated activated carbon for capturing short-chain perfluoroalkyl and polyfluoroalkyl substances from drinking water

Influence of PFDA on the nutrient removal from wastewater by hydrogels containing microalgae-bacteria

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

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