Enhanced removal of per- and polyfluoroalkyl substances in complex matrices by polyDADMAC-coated regenerable granular activated carbon

Ramos, Pia; Kalra, Shashank Singh; Johnson, Nicholas W.; Khor, Chia Miang; Borthakur, Annesh; Cranmer, Brian K.; Dooley, Gregory P.; Mohanty, Sanjay K.; Jassby, David; Blotevogel, Jens; Mahendra, Shaily

doi:10.1016/j.envpol.2021.118603

Cited by 38 publications

(29 citation statements)

References 45 publications

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“…This follows the trend identified in the literature that short-chain PFASs are more prone to adsorption via electrostatic interactions than long-chain PFAS. Ramos et al coated AC with PDADMAC to enhance the retention of short- and long-chain PFAS in various solution conditions . To test the robustness of short-chain PFAS retention in various aqueous environments, PFBA retention onto unmodified and modified AC was evaluated at different solution salinities and organic carbon concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…Ramos et al loaded PDADMAC onto AC to enhance PFAS retention. 52 A dosage optimization study showed that loading PDADMAC onto AC up to 0.025 resulted in an increased PFOA adsorption capacity onto the modified AC adsorbent. Loading levels beyond that point led to a sharp decrease in In contrast, PDADMAC coatings were found to increase the affinity of PFBA toward β-zeolite in Figure 5.…”

Section: Effect Of Pdadmac Loading On Pfas Adsorptionmentioning

confidence: 99%

“…Ramos et al coated AC with PDADMAC to enhance the retention of short-and long-chain PFAS in various solution conditions. 52 To test the robustness of short-chain PFAS retention in various aqueous environments, PFBA retention onto unmodified and modified AC was evaluated at different solution salinities and organic carbon concentrations. Relative PFBA uptake (PFBA adsorption on modified AC to PFBA adsorption on unmodified AC) increased from ∼8% in DI water to up to 50% in 0.2 M ionic strength solutions.…”

Section: Effect Of Pdadmac Loading On Pfas Adsorptionmentioning

confidence: 99%

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Investigation into Cationic Surfactants and Polyelectrolyte-Coated β-Zeolites for Rapid and High-Capacity Adsorption of Short- and Long-Chain PFAS

Hossain

Arm

Ramarao

et al. 2023

Ind. Eng. Chem. Res.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Pdadmac Loading On Pfas Adsorptionmentioning

confidence: 99%

Section: Effect Of Pdadmac Loading On Pfas Adsorptionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation into Cationic Surfactants and Polyelectrolyte-Coated β-Zeolites for Rapid and High-Capacity Adsorption of Short- and Long-Chain PFAS

Hossain

Arm

Ramarao

et al. 2023

Ind. Eng. Chem. Res.

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“…In M8, PFOA was mainly adsorbed on the β-cyclodextrin embedded in the PES support. In contrast, in M0 (which has no β-cyclodextrin), only the pDADMAC-PSS active layer or the PES could provide adsorption sites for PFOA [34][35][36] . Accordingly, PFOA saturation occurred faster for M0, leading to the early drop in the PFOA removal rate until reaching a steady state at ~73%.…”

Section: Pfoa Retention Improved Upon Increasing Adsorbent Loadingmentioning

confidence: 99%

Efficient PFOA removal from drinking water by a dual-functional mixed-matrix-composite nanofiltration membrane

Nir

Chaudhary

Sela-Adler

et al. 2023

Preprint

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Drinking-water contamination by per- and polyfluorinated alkyl substances (PFAS) is a global concern. Nanofiltration is a promising PFAS removal technology due to its scalability and cost-effectiveness. However, nanofiltration cannot typically reduce PFAS concentrations below current drinking-water recommendations. To enhance PFAS removal, we developed mixed-matrix-composite nanofiltration (MMCNF) membranes - an active nanofiltration layer on porous adsorptive support that synergetically combines filtration and adsorption. We synthesized MMCNF membranes comprising thin polyelectrolyte multilayer films deposited on thick (~400 µm) polyethersulfone supports incorporating β-cyclodextrin microparticles. These membranes achieved near complete removal (>99.9%) of model PFAS (perfluorooctanoic acid) for significantly longer filtration times compared to a control membrane without β-cyclodextrin, but otherwise identical. The spent MMCNF membrane was regenerated using ethanol, showing consistent performances in three filtration cycles. Perfluorooctanoic acid was concentrated 38-fold in the ethanol eluent. Further concentration by evaporation is straightforward and can enable eluent recycling and effective PFAS destruction.

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“…The diverse range of PFAS chemistries, high stability of the C-F bond, and high water solubility make PFAS-impacted groundwater difficult to treat and render many of the conventional in situ and ex situ aqueous treatment technologies ineffective, including biodegradation, advanced oxidation processes, and thermal treatment (Crownover et al, 2019;Houtz & Sedlak, 2012;Javed, Lyu et al, 2020;Javed, Metz et al, 2020;McKenzie et al, 2015McKenzie et al, , 2016. While a few emerging destruction technologies such as sonochemical-and plasma-based treatment show promise (Kalra et al, 2021;Kulkarni et al, 2022;Nau-Hix et al, 2021;Ramos et al, 2022), adsorption on granularactivated carbon or ion exchange resins is the commercially preferred method to remove PFAS from water, especially in high flow scenarios such as drinking water treatment. However, adsorption methods are less effective in removing short-chain PFAS and results in residual waste of spent media (Gagliano et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Process to separate per‐ and polyfluoroalkyl substances from water using colloidal gas aphrons

Kulkarni

Aranzales

Javed

et al. 2022

Remediation Journal

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Current ex situ per-and polyfluoroalkyl substances (PFAS) remediation strategies often involve the treatment of large volumes of PFAS-impacted water via separation processes to concentrate PFAS for subsequent treatment or disposal. This study presents a new method for concentrating PFAS that relies on colloidal gas aphrons (CGAs), unusual microstructures composed of water, multilayers of surfactants, and air, that can be used for separation via electrostatic and hydrophobic sorption. This study successfully demonstrates the efficacy of CGAs in removing ionic dyes (as PFAS surrogates) (81%-91%), as well as ultra-short and short-chain PFAS (60%-90%) and perfluorooctanoic acid (PFOA, 88%) within 10 min. However, poor removal of perfluorooctane sulfonic acid (PFOS, 0%) was observed within 10 min of treatment. Compared to bubbling with nitrogen alone, and nitrogen with cetrimonium bromide (CTAB) in bulk solution, CGAs demonstrate significantly higher removal of perfluorobutanoic acid, a short-chain PFAS (0% for N 2 , 11% for N 2 + CTAB, and 90% for CGAs). These results suggest that CGAs may serve as a promising new separation and concentration technology for removing a suite of PFAS from water, particularly for difficult to remove short-chained compounds.

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Enhanced removal of per- and polyfluoroalkyl substances in complex matrices by polyDADMAC-coated regenerable granular activated carbon

Cited by 38 publications

References 45 publications

Investigation into Cationic Surfactants and Polyelectrolyte-Coated β-Zeolites for Rapid and High-Capacity Adsorption of Short- and Long-Chain PFAS

Investigation into Cationic Surfactants and Polyelectrolyte-Coated β-Zeolites for Rapid and High-Capacity Adsorption of Short- and Long-Chain PFAS

Efficient PFOA removal from drinking water by a dual-functional mixed-matrix-composite nanofiltration membrane

Process to separate per‐ and polyfluoroalkyl substances from water using colloidal gas aphrons

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