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Adsorption behavior of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on boehmite
Abstract
Understanding the interaction of perfluorochemicals, persistent pollutants with known human health effects, with mineral compounds in surface water and groundwater environments is essential to determining their fate and transport. Kinetic experiments showed that adsorption equilibrium can be achieved within 48 h and the boehmite (AlOOH) surface is receptive to perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) adsorption. The adsorption isotherms estimated the maximum adsorption capacities of PFOS and PFOA on boehmite as 0.877 μg m(-2) and 0.633 μg m(-2), respectively. Compared to the adsorption capacity on γ-alumina, the abundant hydroxyl groups on boehmite surfaces resulted in the 2-3 times higher adsorption of PFOS and PFOA. Increasing solution pH led to a moderate decrease in PFOS and PFOA adsorption, owing to an increase in ligand exchange reactions and the decrease of electrostatic interactions. The presence of NaCl and CaCl(2) in solution demonstrated negative effects for PFOS and PFOA adsorption on boehmite surfaces, with potential mechanisms being electrical double layer compression, competitive adsorption of chloride, and the Ca(2+) bridging effect between perfluorochemicals.
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“Nevertheless, studies using specific soil minerals validated our finding.For instance, several studies show that PFAAs may sorb onto metal oxides such as iron and aluminum oxides including hematite, goethite, and boehmite (Gao and Chorover, 2012;Tang et al., 2010;Wang et al., 2012;Zhao et al., 2014) particularly because many iron oxides, may have a net positive surface charge around neutral pH (Hs”
From Perfluoroalkyl acids on suspended particles: Significant transport pathways in surface runoff, surface waters, and subsurface soils (2021) · cites this paper as Wang et al., 2012
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Metadata
- Authors
- Wang, F., Liu, C., & Shih, K.
- Affiliations
- University of Hong Kong (HK)
- Corresponding author
- Shih, Kaimin
- Venue
- Chemosphere
- Publisher
- Elsevier BV
- Published
- 2012-11
- Volume
- 89
- Issue
- 8
- Pages
- 1009-1014
- ISSN
- 0045-6535 (ISSN-L)
- OpenAlex
- W2144867616
- Cited by
- 260
- References
- 41
- Citations by year
- 2026: 27 · 2025: 23 · 2024: 32 · 2023: 17 · 2022: 28 · 2021: 22 · 2020: 25 · 2019: 19 · 2018: 13 · 2017: 11 · 2016: 15 · 2015: 8 · 2014: 12 · 2013: 7 · 2012: 1
- FWCI
- 7.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Chemosphere (publishedVersion)
- PubMed (publishedVersion)
- The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Environmental Science › Water Science and Technology › Fluoride Effects and Removal
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Keywords
- PFOS, perfluorooctanoic acid, boehmite, adsorption, perfluorinated compounds, adsorption isotherms, pH effect, chloride interference, calcium interference, electrostatic interactions, ligand exchange, adsorption kinetics, gamma-alumina, groundwater contamination, fate and transport
- MeSH terms
- Adsorption, Aluminum Hydroxide, Aluminum Oxide, Calcium Chloride, Caprylates, Chlorates, Fluorocarbons, Hydrogen-Ion Concentration, Kinetics, Surface Properties, Water Pollutants, Chemical, Alkanesulfonic Acids, Static Electricity
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