A review of PFAS adsorption from aqueous solutions: Current approaches, engineering applications, challenges, and opportunities

Lei, Xiaobo; Lian, Qiyu; Zhang, Xu; Karsili, Tolga K.; Holmes, William E.; Chen, Yushun; Zappi, Mark E.; Gang, Daniel Dianchen

doi:10.1016/j.envpol.2023.121138

Cited by 93 publications

(43 citation statements)

References 154 publications

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“…Given the unique physicochemical properties of PFAS, including the hydrophobic and oleophobic characteristics of the perfluoroalkyl tail and the charged functional headgroup, PFAS are susceptible to various chemical interactions. These include but are not limited to electrostatic, ion exchange, ligand exchange, and hydrophobic interactions, as well as physical interactions, including surface adsorption and occlusion within adsorbent pores. − Specifically, key sorption mechanisms for ion-exchange resins include ion exchange, electrostatic interactions between the charged functional groups of PFAS and the resin matrix, hydrophobic interactions between the fluoroalkyl PFAS tail and the polymer chain of the resin, and the formation of aggregates on active sites of the resin surface, − and carbonaceous adsorbents (such as granular activated carbon) can adsorb PFAS via hydrophobic partitioning of PFAS onto the carbon matrix and via sequestration in micropores, with the larger surface areas of powdered activated carbon, facilitating faster and increased sorption. , Clay and variably modified clay adsorbents, such as amine-modified adsorbents, including clay–carbon composite materials, also facilitate PFAS sorption via mixed mode hydrophobic and electrostatic interactions. ,, As a result, these adsorbent-based treatments are widely applied or the treatment of PFAS-contaminated soil and water, especially focusing on ex situ applications. ,,− …”

Section: Introductionmentioning

confidence: 99%

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Umeh,

Stegh,

Naidu

2023

ACS EST Water

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The potential application of available adsorbents for in situ polyfluoroalkyl substances (PFAS) sequestration, including the release of previously sequestered PFAS under changing groundwater chemistries, was investigated using batch studies. Injectable adsorbent suspensions (IASs) were prepared from 2 anion-exchange resins (A-IXR and L-IXR), a powdered activated carbon, an activated charcoal, a surface-modified organoclay–carbon composite (NMC+ n ), and a carbonaceous-clay-organic material (ROAC). The IAS was amended to water-saturated sand after which multicomponent PFAS sorption and desorption with deionized water and simulated groundwater were investigated. PFAS sorption was instantaneous and chain-length-dependent, reaching approximately 100% in the IAS-amended sand, except for ROAC. In general, PFAS sorption isotherms were nonlinear, with larger sorption capacities of the long-chain than short-chain PFAS. The sorption capacity of the A-IXR (IAS) amendment was 2.5 times the capacities of the other amendments. In simulated groundwater (AGW), PFAS were released (5–100%) from the IAS amendments, especially from A-IXR, affecting mostly the short-chain PFAS and the perfluorocarboxylic acids. The release was attributed to anion exchange and electrical double-layer compression effects driven by the coexisting ions in AGW. Such a considerable release of short- and long-chain PFAS especially from anion-exchange resins should not be overlooked during decision-making regarding in situ PFAS sequestration.

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Section: Introductionmentioning

confidence: 99%

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Umeh,

Stegh,

Naidu

2023

ACS EST Water

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“…This makes the use of electrostatic interaction for PFAS sorption a promising strategy . Mechanisms behind the scenes include well-established electrostatic attraction and ion exchange, whereas the existence of Coulombic repulsion is found to hinder sorption. ,, …”

Section: Interaction Mechanisms With Pfasmentioning

confidence: 99%

Advancing PFAS Sorbent Design: Mechanisms, Challenges, and Perspectives

He,

Cheng,

Gunjal

et al. 2023

ACS Mater. Au

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Per-and polyfluoroalkyl substances (PFAS) are a group of synthetic chemicals characterized with persistence and multisurface resistance. Their accumulation in the environment and toxicity to human beings have contributed to the rapid development of regulations worldwide since 2002. The sorption strategy, taking advantage of intermolecular interactions for PFAS capture, provides a promising and efficient solution to the treatment of PFAS contaminated sources. Hydrophobic and electrostatic interactions are the two commonly found in commercially available PFAS sorbents, with the fluorous interaction being the novel mechanism applied for sorbent selectivity. The main object of this Perspective is to provide a critical review on the current design criteria of PFAS sorbents, with particular focus on their sorption and interaction mechanisms as well as limitations. An outlook on future innovative design for efficient PFAS sorbents is also provided.

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“…CNT, both single-walled (SWCNT) and multi-walled (MWCNT), continue to be proposed as adsorbent platforms for PFAS, but SWCNT show better adsorption performances due to the lower SSA of MWCNT [80]. Also, the modification of CNT with nano-MgAl2O4 has been proposed as an improved adsorbent for PFAS (100 ppb) allowing 99% removal after 3 hours and 100% in 3.5 hours [81].…”

Section: Advances In Concentration Strategies Of Pfasmentioning

confidence: 99%

“…Metal-organic frameworks (MOF), which are innovative nanopores ordered materials with high SSA and pore volumes, have shown an increased application for PFAS adsorption in the last years [80,82,83].…”

Section: Advances In Concentration Strategies Of Pfasmentioning

confidence: 99%

Nanomaterial-Based Advanced Oxidation/Reduction Processes for the Degradation of PFAS

Cardoso¹,

Silva²,

Silva³

2023

Preprint

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This review focus on a critical analysis of nanocatalysts for Advanced Reductive Processes (ARP) and Oxidation Processes (AOP) designed for the degradation of poly/perfluoroalkyl substances (PFAS) in water. Ozone, ultraviolet and photocatalyzed ARP and/or AOP will be the basic treatment technologies. Besides the review of the nanomaterials with greater potential as catalyst for advanced processes of PFAS in water, the perspectives for its future development considering sustainability considerations will be discussed. Moreover, a brief analysis of the current state of the art of the ARP and AOP for the treatment of PFAS in water will be presented.

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A review of PFAS adsorption from aqueous solutions: Current approaches, engineering applications, challenges, and opportunities

Cited by 93 publications

References 154 publications

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Advancing PFAS Sorbent Design: Mechanisms, Challenges, and Perspectives

Nanomaterial-Based Advanced Oxidation/Reduction Processes for the Degradation of PFAS

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