Exploring the origin of efficient adsorption of poly- and perfluoroalkyl substances in household point-of-use water purifiers: Deep insights from a joint experimental and computational study

He, Anen; Lu, Yuexiang; Chen, Fengjie; Li, Feifei; Liu, Kun; Cao, Huiming; Sun, Yuming; Liang, Yong; Li, Juan; Zhao, Li‐Xia; Zhang, Xiang; Li, Lingxiangyu; Wang, Yawei; Jiang, Guibin

doi:10.1016/j.scitotenv.2022.154988

Cited by 23 publications

(15 citation statements)

References 64 publications

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“…Removal of longer chains occurs with 60%–70% efficacy, while that of shorter chains is much less . This pattern is further shown in work by He et al where emerging and shorter chain PFAS are not well retained by AC, with removal ranging from 1% to 23% . Even though the capture of long-chain PFAS exceeds 90%, a 40 min equilibration time was required.…”

Section: Introductionmentioning

confidence: 80%

Rapid Capture of Per- and Polyfluoroalkyl Substances Using a Self-Assembling Zirconium-Based Metal-Organic Cage

Camdzic,

Welgama,

Crawley

et al. 2023

ACS Appl. Eng. Mater.

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Legacy and emerging per-and polyfluoroalkyl substances (PFAS) are widely detected in environmental and human samples because of their widespread use and resistance to degradation. Due to the increasing concern on health impacts of PFAS resulting from exposure to contaminated water, the development of novel materials to capture and remove PFAS from the environment is needed. Here, we present a self-assembling, fluorinated, zirconium-based metal−organic cage (F-ZrMOC) capable of capturing 37 different PFAS species, at an average of 82% removal from a solution that contains 400 ng/mL of each individual PFAS. The F-ZrMOC captured different classes of PFAS within 30 s, including perfluoroalkyl carboxylates, sulfonates, sulfonamides, ethoxylates, and fluorotelomer carboxylates/sulfonates/alcohols from water during in-vial, static, and flow through exposures (in which the F-ZrMOC is used as a solid phase extraction sorbent). Removal efficiency is higher for PFAS with chain lengths of seven carbons or higher; the presence of complex matrices such as untreated wastewater and groundwater samples did not significantly reduce the removal efficiencies for PFAS. The F-ZrMOC was characterized using 1 H and 19 F nuclear magnetic resonance (NMR) spectroscopy, and the stoichiometry of the synthesized cage was confirmed using Fourier transform-ion cyclotron resonance mass spectrometry. The surface area and pore size of F-ZrMOC were further determined by N 2 and CO 2 sorption measurements. 19 F-NMR spectroscopy revealed that solvent plays an important role in the capture of PFAS; once the cages are in contact with methanol solution, captured PFAS are released.

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Section: Introductionmentioning

confidence: 80%

Rapid Capture of Per- and Polyfluoroalkyl Substances Using a Self-Assembling Zirconium-Based Metal-Organic Cage

Camdzic,

Welgama,

Crawley

et al. 2023

ACS Appl. Eng. Mater.

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“…D ow described the hydrophobicity of PFAS with the consideration of molecule deprotonation, which may be a more suitable indicator related to PFAA adsorption than the octanol–water partition coefficient ( K ow ) . To avoid the potential inconsistency of reported values from different literature, the log D ow values of the examined PFAAs in the present work were obtained from a single source (MarvinSketch, Table S1) that has been commonly used in previous studies. − The hierarchical multiple regression analysis would quantify and rank relative contributions from the predictor variables to the total variance of log K d based on the results of analysis of variance (ANOVA).…”

Section: Results and Discussionmentioning

confidence: 99%

Adsorption of Per- and Polyfluoroalkyl Substances (PFAS) by Aquifer Materials: the Important Role of Dolomite

Zhao,

Min,

et al. 2023

Environ. Sci. Technol. Lett.

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The widespread detection of per-and polyfluoroalkyl substances (PFAS) within the groundwater system, which represents a major drinking water source, poses serious public health risks. Because of the recalcitrant nature of many PFAS such as perfluoroalkyl acids (PFAAs), their transport and fate within groundwater aquifers are determined by their interactions with the aquifer materials. The focus of this study is to quantify the adsorption of PFAAs by aquifer materials under environmentally relevant conditions. Our results showed that the adsorption of PFAAs by the aquifer materials was primarily correlated with (1) PFAA chemical structures including fluoroalkyl chain lengths and end functional groups and (2) dolomite fractions of the aquifer materials. An empirical relationship was developed based on multiple variable linear regression analysis to estimate the aquifer material−water partition coefficient (K d ) of PFAAs from the dolomite fraction of aquifer materials and the octanol−water distribution coefficient (D ow ) of PFAAs. Our findings demonstrated the critical but overlooked role of dolomite in PFAA adsorption and may facilitate the modeling of PFAA transport within a groundwater system.

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“… Because of the incomplete ionization of the carboxylic acid group, PFCAs and HFPO-DA mostly exist in the form of neutral species, which are less soluble than the ionic state. They have a higher hydrophobicity (presented as the apparent partition coefficient Log Dow at pH = 3, Table S4) than fully ionized PFSAs and 6:2 Cl-PFESA. Unexpectedly, the gastric bioaccessibility of PFCAs is slightly higher than that of PFSAs, which is further supported by the stronger protein binding ability of the sulfonic functional group in PFSAs than that of the carboxylic acid group in PFCAs .…”

Section: Resultsmentioning

confidence: 99%

Tracing the Bioaccessibility of Per- and Polyfluoroalkyl Substances in Fish during Cooking Treatment

Zhao,

Wang,

Zhang

et al. 2023

J. Agric. Food Chem.

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Exploring the origin of efficient adsorption of poly- and perfluoroalkyl substances in household point-of-use water purifiers: Deep insights from a joint experimental and computational study

Cited by 23 publications

References 64 publications

Rapid Capture of Per- and Polyfluoroalkyl Substances Using a Self-Assembling Zirconium-Based Metal-Organic Cage

Rapid Capture of Per- and Polyfluoroalkyl Substances Using a Self-Assembling Zirconium-Based Metal-Organic Cage

Adsorption of Per- and Polyfluoroalkyl Substances (PFAS) by Aquifer Materials: the Important Role of Dolomite

Tracing the Bioaccessibility of Per- and Polyfluoroalkyl Substances in Fish during Cooking Treatment

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