2022
DOI: 10.1021/acscentsci.2c00478
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A Tunable Porous β-Cyclodextrin Polymer Platform to Understand and Improve Anionic PFAS Removal

Abstract: Cross-linked polymers containing β-cyclodextrin (β-CD) are promising adsorbents with demonstrated removal performances for per- and polyfluoroalkyl substances (PFASs) from contaminated water sources. Despite the promising performance of some β-CD-based adsorbents for PFAS removal, many of these materials are not amenable for rational performance improvement or addressing fundamental questions about the PFAS adsorption mechanisms. These ambiguities arise from the poorly defined structure of the cross-linked pol… Show more

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Cited by 45 publications
(51 citation statements)
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“…The mobile phase gradient program is described in Table S2 and in the text in the SI. The HPLC-MS/MS was operated with electrospray ionization in negative polarity mode and data was acquired by means of an established parallel reaction monitoring (PRM) method optimized for PFAS quantification. , A nine-point calibration curve with concentrations ranging from 0 to 1000 ng L –1 and spiked with a fixed mass of ILISs was prepared for quantification of PFAAs using PFAA product ion-to-ILIS peak area ratio responses by linear least-squares regression. Calibration curves were run at the beginning of the analytical run.…”
Section: Methodsmentioning
confidence: 99%
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“…The mobile phase gradient program is described in Table S2 and in the text in the SI. The HPLC-MS/MS was operated with electrospray ionization in negative polarity mode and data was acquired by means of an established parallel reaction monitoring (PRM) method optimized for PFAS quantification. , A nine-point calibration curve with concentrations ranging from 0 to 1000 ng L –1 and spiked with a fixed mass of ILISs was prepared for quantification of PFAAs using PFAA product ion-to-ILIS peak area ratio responses by linear least-squares regression. Calibration curves were run at the beginning of the analytical run.…”
Section: Methodsmentioning
confidence: 99%
“…We and others have previously demonstrated the efficacy of CDPs for removing various PFASs from water. ,,, However, all previous studies have evaluated the efficacy of the as-synthesized CDP powders. In this study, we aim to evaluate the performance of CDP granules of varying particle sizes as a means to transition these novel adsorbents toward implementation in PBF systems.…”
Section: Introductionmentioning
confidence: 99%
“…The fluorescence response of polymer thin films (30–50 Å thick) to aqueous solutions of PFOA was studied by introducing the films into sealed vials (20 mL capacity) containing 2.5 mL of different concentrations of PFOA in milliQ water. The mechanism of fluorescence change is the protonation of a nitrogen atom of a Lewis base (pyridine), and proton-transfer reactions are considered to occur nearly instantaneously; as a result, the most relevant and time-limiting factor that contributes to the fluorescence response is the time needed for PFOA molecules to diffuse from water to the fluorophilic polymer films. …”
Section: Resultsmentioning
confidence: 99%
“…Our method relies on highly fluorinated polymers with poly­( p -phenylene ethynylene) (PPE) and polyfluorene (PF) backbones bearing pyridine-based selectors that react with acidic PFAS (i.e., PFOA and PFOS) via a proton-transfer reaction (Figure ). The fluorinated domains within the polymer backbone partition PFAS into polymers, while the protonated pyridine units produce new emissive signals that are amplified by excitonic energy transport. Specifically, we designed two acidic PFAS selectors ( Py and Py* in Figure ), where the π-electron delocalizing character of the thiophene bridges in Py* triggers larger changes in fluorescence after protonation, in comparison to the simple pyridine selector ( Py ).…”
Section: Introductionmentioning
confidence: 99%
“…However, most adsorbents, such as clay, zeolite and activated carbon, have the disadvantages of low adsorption rate, poor adsorption e ciency and high regenerating spent. One of the hottest materials in adsorption eld to overcome these disadvantages is high-surfacearea, porous polymers, for example, rigid molecule hyper-crosslinked insoluble β-cyclodextrin (β-CD) polymers [8][9][10][11] . However, there are still some problems, such as the use of rigid aromatic crosslinkers, long contact time and poor adsorption performance for pollutant mixture.…”
Section: Full Textmentioning
confidence: 99%