Cited by 1,249Per- and polyfluoroalkyl substances researchAdsorption and biosorption for pollutant removalEnvironmental remediation with nanomaterials

Removal of poly- and perfluoroalkyl substances (PFAS) from water by adsorption: Role of PFAS chain length, effect of organic matter and challenges in adsorbent regeneration

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Gagliano, Erica, Sgroi, Massimiliano, Falciglia, Pietro P., Vagliasindi, Federico G.A., Roccaro, Paolo·2020·Water Research

Abstract

Poly- and perfluoroalkyl substances (PFAS) are a wide group of environmentally persistent organic compounds of industrial origin, which are of great concern due to their harmful impact on human health and ecosystems. Amongst long-chain PFAS, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) are the most detected in the aquatic environment, even though their use has been limited by recent regulations. Recently, more attention has been posed on the short-chain compounds, due to their use as an alternative to long-chain ones, and to their high mobility in the water bodies. Therefore, short-chain PFAS have been increasingly detected in the environmental compartments. The main process investigated and implemented for PFAS removal is adsorption. However, to date, most adsorption studies have focused on synthetic water. The main objective of this article is to provide a critical review of the recent peer-reviewed studies on the removal of long- and short-chain PFAS by adsorption. Specific objectives are to review 1) the performance of different adsorbents for both long- and short-chain PFAS, 2) the effect of organic matter, and 3) the adsorbent regeneration techniques. Strong anion-exchange resins seem to better remove both long- and short-chain PFAS. However, the adsorption capacity of short-chain PFAS is lower than that observed for long-chain PFAS. Therefore, short-chain PFAS removal is more challenging. Furthermore, the effect of organic matter on PFAS adsorption in water or wastewater under real environmental conditions is overlooked. In most studies high PFAS levels have been often investigated without organic matter presence. The rapid breakthrough of PFAS is also a limiting factor and the regeneration of PFAS exhausted adsorbents is very challenging and needs more research.

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Crossref · 10.1016/j.watres.2019.115381

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  • The hydrophobic and lipophobic nature of PFAS can be primarily attributed to the low polarizability of fluorine atoms, combined with the presence of a stable terminal functional group attached to the fluoroalkyl chain.

    “Additionally, the hydrophobic and lipophobic nature of PFAS can be primarily attributed to the low polarizability of fluorine atoms, combined with the presence of a stable terminal functional group attached to the fluoroalkyl chain (Gagliano et al., 2020; Meegoda et al., 2020).”

    From Estimation of per- and polyfluoroalkyl substances (PFAS) half-lives in human studies: a systematic review and meta-analysis (2024) · cites this paper as Gagliano et al., 2020

    Section 1.2 (PFAS properties) attributes PFAS’ hydrophobic and lipophobic properties primarily to the low polarizability of fluorine atoms. It says separately that the terminal functional group provides chemical stability, not that it contributes to those hydrophobic and lipophobic properties. (LLM, conf=0.91)

    Experimental — accuracy not yet measured
  • Salting-out effects promote PFAS sorption and passive retention within the outer root tissues.

    “At the same time, the salting-out effects promotes PFAS sorption and passive retention within the outer root tissues [82].”

    From Influence of root morphology and salinity on PFAS uptake by ten Australian wetland plant species (2026) · cites this paper as [82]

    Section 2.1 (page unavailable) says that at high salt concentrations, salting-out reduces PFAS solubility and can encourage adsorption onto adsorbent surfaces. It does not address passive retention in outer root tissues; its discussion concerns materials used to remove PFAS from water. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Adsorption and oxidation-reduction reactions are primary removal mechanisms for PFAS and some microplastics and tire wear compounds.

    “In addition, adsorption and oxidation-reduction reactions are primary removal mechanisms for PFAS and some microplastics and tire wear compounds, (Douna and Yousefi, 2023; Gagliano et al., 2020; Huang et al., 2023; Padervand et al., 2020; Silvani et al., 2019).”

    From Review of emerging contaminants in green stormwater infrastructure: antibiotic resistance genes, microplastics, tire wear particles, PFAS, and temperature (2024) · cites this paper as Gagliano et al., 2020

    Section 1.5 (PFAS removal) identifies adsorption as an established, effective method for removing PFAS. It says PFAS resist oxidation by ozone and hydroxyl radicals and that advanced oxidation often degrades them only partially, so it does not support oxidation-reduction as a primary PFAS removal mechanism. The paper also does not establish removal mechanisms for microplastics or tire wear compounds. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Anion exchange resins are more effective compared to activated carbon in removing both long- and short-chain PFAS from water.

    “Anion exchange resins, while not commonplace in DWTPs [31], are more effective compared to activated carbon in removing both long-and short-chain PFAS from water [16]; in this configuration, GAC filtration may be replaced by anion exchange resins.”
  • Adsorption/filtration units applying either activated carbon or anion exchange resins require appropriate regeneration of spent materials, which is a major drawback.

    “It is necessary to note that adsorption/filtration unit applying either activated carbon or anion exchange resins requires appropriate regeneration of spent materials (i.e., PFAS-exhausted materials), which is a major drawback [16].”

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Research works printed but not linked: 1

  1. [39]39. ITRC, 2017. Naming Conventions and Physical and Chemical Properties of Per-and Polyfluoroalkyl Substances (PFAS) 1-15. https://doi.org/10.1002/ieam.258 · DOI · Paper page

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Authors
Gagliano, E., Sgroi, M., Falciglia, P. P., Vagliasindi, F. G. A., & Roccaro, P.
Affiliations
University of Catania (IT)
Corresponding author
Roccaro, Paolo
Venue
Water Research
Publisher
Elsevier BV
Published
2020-03
Volume
171
Pages
115381
ISSN
0043-1354 (ISSN-L)
OpenAlex
W2995462441
Cited by
1,249
References
91
Citations by year
2026: 245 · 2025: 317 · 2024: 238 · 2023: 184 · 2022: 143 · 2021: 95 · 2020: 27
FWCI
5.58
Type
journal article
Language
en
Open access
Locations
  • Water Research (publishedVersion)
  • PubMed (publishedVersion)
  • Università Politecnica delle Marche (Università Politecnica delle Marche) (submittedVersion, cc-by-nc-nd)
  • CINECA IRIS Institutial Research Information System (University of Genoa) (submittedVersion)
Funders
Università di Catania
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
Keywords
per- and polyfluoroalkyl substances, PFAS removal, adsorption, short-chain PFAS, long-chain PFAS, perfluorooctanoic acid, PFOS, organic matter, adsorbent regeneration, anion exchange resin, adsorption capacity, breakthrough, water treatment, wastewater treatment
MeSH terms
Adsorption, Fluorocarbons, Humans, Water, Water Pollutants, Chemical, Ecosystem

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