2022
DOI: 10.1016/j.watres.2022.119019
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Pilot study comparison of regenerable and emerging single-use anion exchange resins for treatment of groundwater contaminated by per- and polyfluoroalkyl substances (PFASs)

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Cited by 47 publications
(34 citation statements)
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“…This shows that H 2 CO 3 * is the dominant quencher species at pH < 9 despite the fact that it is a minor contributor to carbonate speciation at pH > 6. 35. The dominance of quenching by H 2 CO 3 * at pH < 9 is further highlighted by the fact that all the individual e aq − measurements at these pH conditions (40 different data points at varying concentration and pH conditions) fall onto a single Stern− Volmer-type plot when the x-axis is re-defined by the calculated concentration of H 2 CO 3 * (Figure S7) rather than total dissolved carbonate (C T,COd 3 ).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…This shows that H 2 CO 3 * is the dominant quencher species at pH < 9 despite the fact that it is a minor contributor to carbonate speciation at pH > 6. 35. The dominance of quenching by H 2 CO 3 * at pH < 9 is further highlighted by the fact that all the individual e aq − measurements at these pH conditions (40 different data points at varying concentration and pH conditions) fall onto a single Stern− Volmer-type plot when the x-axis is re-defined by the calculated concentration of H 2 CO 3 * (Figure S7) rather than total dissolved carbonate (C T,COd 3 ).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…To eliminate e aq – scavenging by dissolved oxygen, solutions were deoxygenated by sparging with N 2(g) for 1 h before introducing PFOS and sulfite to initiate UV reactions. Sample aliquots were collected at pre-determined time intervals to measure changing PFOS concentrations which were measured by liquid chromatography with tandem mass spectrometry (LC–MS/MS) using procedures and instrumentation described elsewhere . Solution pH was re-measured after the reaction was completed to evaluate any pH drift during experiments.…”
Section: Methodsmentioning
confidence: 99%
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“…The adsorption rate constants of PFAS adsorption capacities of DOWEX MB‐50 were in the order of k 2(PFHxS) > k 2(PFOS) > k 2(PFOA) . Based on the properties of DOWEX MB‐50 (Table 1), the quaternary amine functional group increases the hydrophobicity close to the adsorption site and increases the affinity of the adsorbent for PFAS (Ellis et al, 2022). This result is consistent with the study by Liu and Sun (2021), who reported that gel‐type resins work better with short‐chain PFAS.…”
Section: Resultsmentioning
confidence: 99%
“…Currently, sorption methods using granular activated carbon (GAC) or anion exchange (AIX) resins are frequently employed to remove PFAS from water in large-scale operations. More recently, single-use AIX resins have been investigated for removing PFECAs and short-chain PFAS from water in laboratory- and pilot-scale experiments. , The predominant residual from GAC and AIX resin systems is the spent adsorbents containing PFAS. It has been observed that regenerating PFAS-laden spent adsorbents can be challenging using organic solvents or brine. For example, methanol alone could only extract less than 50% of PFOA and PFOS from GAC .…”
Section: Introductionmentioning
confidence: 99%