Sorption of perfluoroalkyl substances to two types of minerals

Hellsing, Maja S.; Josefsson, Sarah; Hughes, A.; Ahrens, Lutz

doi:10.1016/j.chemosphere.2016.06.016

Cited by 82 publications

(61 citation statements)

References 39 publications

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“…This was consistent with what has been previously reported in the literature for sorption to other carbon-based remediation materials (Deng et al 2012;Xiao et al 2017). When keeping the functional group the same, increase in the C-F chain length decreases the solubility (Hellsing et al 2016) and increases hydrophobicity of PFASs, which allows for stronger hydrophobic interactions with the adsorbents .…”

Section: Remediation Of a Contaminated-site Water Samplesupporting

confidence: 91%

“…The main component of the contaminated water sample was PFOS at 600 mg L À1 , of which .99 % was removed by FeG and RemB. It has been observed in previous studies that for the same perfluorocarbon chain lengths, PFASs with sulfonate head groups exhibit greater sorption than those with carboxylate groups (Hellsing et al 2016;Higgins and Luthy 2006;Wang and Shih 2011). Hence the extraordinary sorption of PFOS over PFOA can be attributed to the differences in functional groups.…”

Section: Remediation Of a Contaminated-site Water Samplementioning

confidence: 87%

“…These rely on hydrophobic interactions at the non-polar C-phase (Kucharzyk et al 2017). Aluminium (Al) and iron (Fe)based minerals (Feng et al 2017;Gao and Chorover 2012;Hellsing et al 2016;Wang et al 2012), like alumina, hematite and goethite, have also been shown to bind PFASs through electrostatic or ligand-exchange mechanisms . Graphene, composed of closely packed sp 2 hybridised Catoms (Novoselov et al 2012), the latest addition to the nanocarbon family, is an excellent candidate for use as an adsorbent, owing to its high surface area and versatile surface chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Sorptive remediation of perfluorooctanoic acid (PFOA) using mixed mineral and graphene/carbon-based materials

et al. 2018

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Environmental context. Per-and poly-fluoroalkyl substances (PFASs) are contaminants of emerging concern, creating a need to develop efficient multi-functional adsorbents for improved remediation performance. By exploiting the versatility of graphene technology, we demonstrate that combining mineral and carbonaceous phases greatly increases and strengthens PFAS-binding to the adsorbent. The study highlights the benefits and potential applications of mixed adsorbents in PFAS-remediation.Abstract. As the degradation of perfluorooctanoic acid (PFOA) and related per-and poly-fluoroalkyl substances (PFASs) is energy-intensive, there is a need to develop in situ remediation strategies to manage PFAS-contamination. The sorption of PFOA by graphene oxide (GO), an iron-oxide-modified reduced-GO composite (FeG) and an activated-carbon(C)/clay/ alumina-based adsorbent, RemBind TM (RemB), are evaluated. Sorption by FeG and RemB (.90 %) is much greater than GO (60 %). While an increase in pH hinders PFOA-sorption by GO, owing to the increased repulsion of anionic PFOA, variations in pH and ionic strength do not significantly influence PFOA-sorption by FeG and RemB, which indicates that binding is predominantly controlled by non-electrostatic forces. Hydrophobic interactions are assumed at the graphene or C-surface for all adsorbents, with added ligand-exchange mechanisms involving the associated Fe-and Al-minerals in FeG and RemB, respectively. Desorption of adsorbed PFOA is greatest in methanol, compared to water, toluene, or hexane, which provides estimates of the binding strength and reversibility from an environmental-partitioning perspective; i.e. risk of remobilisation of bound PFOA owing to rainfall events is low, but the presence of polar organic solvents may increase leaching risk. Iron-mineral-functionalisation of GO enhances the amount of PFOA adsorbed (by 30 %) as well as the binding strength, which highlights the advantage of combining mineral and C-phases. Successful sorption of a range of PFASs from a contaminated-site water sample highlights the potential of using 'mixed' adsorbents like FeG and RemB in situ for PFAS-remediation, as they provide avenues for enhanced sorption through multiple mechanisms.

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Section: Remediation Of a Contaminated-site Water Samplesupporting

confidence: 91%

Section: Remediation Of a Contaminated-site Water Samplementioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Sorptive remediation of perfluorooctanoic acid (PFOA) using mixed mineral and graphene/carbon-based materials

et al. 2018

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“…Sorption has also been reported to increase with increasing soluble calcium concentrations, which also suggests electrostatic interactions are involved [88]. Sorption by an electrostatic interaction can be easily desorbed by a change in solution chemistry [89].…”

Section: Subsurface Processes and Pfas In Marmentioning

confidence: 96%

“…Factors affecting electrostatic interaction will be crucial for PFAS sorption to mineral surfaces. A positive surface charge is favorable for electrostatic interaction between the mineral surface and the negative PFAS functional group [89]. The mineral phases in Table 5 are listed in order of decreasing potential for adsorption based on expected positive charge at a neutral pH (pH ZPC > 7).…”

Section: Key Potential Processes In the Natural Attenuation Of Pfas Imentioning

confidence: 99%

Risks of Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) for Sustainable Water Recycling via Aquifers

Page

Vanderzalm

Kumar

et al. 2019

Water

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The prediction of the fate of perfluoroalkyl and polyfluoroalkyl substances (PFAS) in water recycling with urban stormwater and treated wastewater is important since PFAS are widely used, persistent, and have potential impacts on human health and the environment. These alternative water sources have been utilized for water recycling via aquifers or managed aquifer recharge (MAR). However, the fate of these chemicals in MAR schemes and the potential impact in terms of regulation have not been studied. PFAS can potentially be transported long distances in the subsurface during MAR. This article reviews the potential risks to MAR systems using recycled water and urban stormwater. To date, there are insufficient data to determine if PFAS can be degraded by natural processes or retained in the aquifer and become suitable pre-treatment or post-treatment technologies that will need to be employed depending upon the end use of the recovered water. The use of engineered pre-treatment or post-treatment methods needs to be based on a ‘fit for purpose’ principle and carefully integrated with the proposed water end use to ensure that human and environmental health risks are appropriately managed.

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Sustainable per‐ and polyfluoroalkyl substances contaminated soil remediation: Evaluating the potential of thermal desorption

Rassaei

2023

Env Prog and Sustain Energy

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Per‐ and polyfluoroalkyl substances (PFASs) have been extensively utilized in various industries. These artificial compounds pose significant environmental and health concerns as they exhibit persistence in soil over long periods and can migrate through soil and groundwater. One potential method for addressing PFASs toxicity is thermal desorption, although its efficacy in calcareous soil remains understudied. In this experimental investigation, we aimed to evaluate the effectiveness of thermal desorption in removing PFASs from two types of calcareous soil: spiked clay and sandy clay loam soil. PFASs were spiked into soil samples, which were subsequently freeze‐dried and homogenized. The samples underwent thermal desorption, followed by extraction and analysis of remaining PFASs concentrations using UPLC MS/MS. The study examined the impact of different temperatures, times, and soil types on PFASs removal. Results revealed that the removal fraction of PFASs increased with higher temperatures, although the specific effect varied depending on the soil type and the characteristics of the PFASs. Optimal PFASs removal occurred within the temperature range of 350 to 450°C, with a treatment time of 40 to 60 min. ANOVA analysis indicated a significant interaction between temperature and time, highlighting the influence of temperature on PFASs desorption. The correlation coefficient demonstrated a negative relationship between temperature and PFASs removal from the soil sample. This study successfully demonstrated the effectiveness of thermal desorption in removing PFASs from calcareous soils. The findings contribute to the development of effective strategies for mitigating the environmental and health risks associated with PFASs contamination in soil.

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Sorption of perfluoroalkyl substances to two types of minerals

Cited by 82 publications

References 39 publications

Sorptive remediation of perfluorooctanoic acid (PFOA) using mixed mineral and graphene/carbon-based materials

Sorptive remediation of perfluorooctanoic acid (PFOA) using mixed mineral and graphene/carbon-based materials

Risks of Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) for Sustainable Water Recycling via Aquifers

Sustainable per‐ and polyfluoroalkyl substances contaminated soil remediation: Evaluating the potential of thermal desorption

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