Efficient removal of short-chain and long-chain PFAS by cationic nanocellulose

Li, Duning; Lee, Cheng‐Shiuan; Zhang, Yi; Das, Rasel; Akter, Fahmida; Venkatesan, Arjun K.; Hsiao, Benjamin S.

doi:10.1039/d3ta01851b

Cited by 15 publications

(2 citation statements)

References 51 publications

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“…However, in the case of PFBA in Saint-Donat waters, removal was slightly reduced at 94%, after 160 L, probably due to higher levels of total PFAS, chloride and TDS (Table 2) and the challenges in sorbing short-chain PFAS on activated carbon and AIX due to the more hydrophilic nature of shorter chain PFAS. Earlier studies have indicated that the primary mechanism responsible for removing short-chain PFAS is the electrostatic interaction with the adsorbent (Li et al, 2023). However, in the case of Saint-Donat water, this mechanism in ZeroWater may have been exhausted sooner compared to Montreal tap water.…”

Section: Resultsmentioning

confidence: 99%

Performance of pitcher-type POU filters for the removal of 75 PFAS from drinking water: comparing different water sources

Teymoorian,

Dinh,

Barbeau

et al. 2024

Front. Environ. Chem.

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This study presents a comprehensive assessment of the performance of popular pitcher-type point-of-use (POU) water filters to remove PFAS contaminants from tap waters. The evaluated filters, Brita (Elite and Standard), ZeroWater, Aquagear, and ClearlyFiltered, were tested for their efficacy in removing 75 targeted PFAS, total organic carbon (TOC), total dissolved solids (TDS), chloride, and sulfate from two Canadian tap waters with background Σ75 PFAS concentrations of 13 and 56 ng/L. Overall, the performances of the filters varied depending on the structure of the filter media, the water source, and the specific contaminants present. ZeroWater was the top performer in the case of total PFAS removal. The volume-weighted average removal of total PFAS after 160 L of filtration using Saint-Donat tap water was 99% for ZeroWater, 99% for ClearlyFiltered, 77% for Aquagear, and 20% for Brita (Elite). In the case of Montreal tap water, which had different water characteristics and lower total PFAS levels, the volume-weighted average removal for PFAS was ≈100% for ZeroWater, 96% for ClearlyFiltered, 60% for Aquagear, 48% for Brita (Elite), and 38% for Brita (Standard). Both laboratory and home tests involving ZeroWater filters yielded similar high-performance results using Montreal tap water. Although ZeroWater exhibited high PFAS removal (99%) in Saint-Donat water, TDS and TOC desorption and a significant drop in pH were observed after 80 L, a phenomenon which was explained by the higher total concentration of anions in this water. In contrast, no desorption was observed in Montreal tap water for TDS and TOC due to the lower concentrations of anions. The Aquagear filter demonstrated an unusual increase in concentrations of sulfate after the initial 20 L, which needs further evaluation. This study discusses individual filter performance, the influence of tap water characteristics, and the potential to meet the new NSF guidelines, which provides valuable insights for consumers seeking to choose an appropriate easy-to-use water filtration system to ensure safe and clean drinking water in different regions.

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Section: Resultsmentioning

confidence: 99%

Performance of pitcher-type POU filters for the removal of 75 PFAS from drinking water: comparing different water sources

Teymoorian,

Dinh,

Barbeau

et al. 2024

Front. Environ. Chem.

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“…This phenomenon is generally caused by the change of surface charges of sorbates or adsorbents. [41] Since the pKa value of PFOS is À 3.27 (Table S4), and PFOS is negatively charged in water in the studied pH range, thus, the surface charges of PCN-224 should be sensitive to the pH values. This is supported by the fluorescence and zeta potential tests of PCN-224.…”

Section: Ph Effect On Adsorptionmentioning

confidence: 99%

A Porphyrinic Metal‐Organic Framework with Cooperative Adsorption Domains for PFAS Removal from Water

Zhang,

Kong,

et al. 2024

ChemSusChem

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The removal of toxic poly− and perfluoroalkyl substances (PFAS) as persistent pollutants from wastewater is imperative but challenging for water remediation. Many adsorbents including activated carbon, biochar, and clay minerals have been investigated for PFAS removal, but most of these materials are faced with high cost or/and low efficiency. The use of metal−organic frameworks (MOFs) as sorbents is attractive for efficient removal of PFAS due to their tailor‐made structures and high surface areas. Herein, we synthesized, characterized a water stable Zr−based porphyrinic MOF (PCN−224) with cooperative adsorption domains, and demonstrated its excellent capture performance toward perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS) and perfluorobutane sulfonate (PFBS). PCN−224 has maximum uptake capacities of 963, 517, and 395 mg g−1 for PFOS, PFHxS, and PFBS, respectively, which are much higher than that of granular activated carbon. Moreover, coexistent anions (Cl−, SO42−) and humic acid have negligible effects on PFOS adsorption. The excellent adsorption performance of PCN−224 toward PFOS is due to the orthogonal cationic channel pores with a diameter of 1.9 nm, hydrophobic porphyrin units, and the Zr6 clusters with acidic sites. PCN−224 can be readily regenerated and reused. This work highlights the potential of MOFs with multiple adsorption domains for water remediation.

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In vitro and in vivo remediation of per- and polyfluoroalkyl substances by processed and amended clays and activated carbon in soil

Wang,

Rivenbark,

Nikkhah

et al. 2024

Applied Soil Ecology

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Efficient removal of short-chain and long-chain PFAS by cationic nanocellulose

Abstract: Although most manufacturers stopped using long-chain per- and polyfluoroalkyl substances (PFASs), including perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), short-chain PFASs are still widely employed. Short-chain PFASs are less known...

Cited by 15 publications

References 51 publications

Performance of pitcher-type POU filters for the removal of 75 PFAS from drinking water: comparing different water sources

Performance of pitcher-type POU filters for the removal of 75 PFAS from drinking water: comparing different water sources

A Porphyrinic Metal‐Organic Framework with Cooperative Adsorption Domains for PFAS Removal from Water

In vitro and in vivo remediation of per- and polyfluoroalkyl substances by processed and amended clays and activated carbon in soil

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