Characterization of a mixed mode fluorocarbon/weak anion exchange sorbent for the separation of perfluoroalkyl substances

IF 2.8 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of separation science Pub Date : 2024-08-27 DOI:10.1002/jssc.202400413
Aghogho A. Olomukoro, Ruichao Xie, Fabiola X. Fernandez Paucar, Charlotte DeRosa, Neil D. Danielson, Emanuela Gionfriddo
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Abstract

The ubiquitous presence and persistence of per- and polyfluoroalkyl substances (PFAS) in the environment have raised concerns in the scientific community. Current research efforts are prioritizing effective PFAS remediation through novel sorbents with orthogonal interaction mechanisms. Recognized sorption mechanisms between PFAS and sorbents include hydrophobic, electrostatic, and fluorine-fluorine interaction. The interplay of these mechanisms contributes significantly to improved sorption capacity and selectivity in PFAS separations. In this study, a primary/secondary amine-functionalized polystyrene-divinylbenzene (Sepra-WAX) polymer was modified to create a fluorinated WAX resin (Sepra-WAX-KelF-PEI). The synthesis intermediate (Sepra-WAX-KelF) was also tested to assess the improvement of the final product (Sepra-WAX-KelF-PEI). The adsorption capacity of Sepra-WAX, Sepra-WAX-KelF, and Sepra-WAX-KelF-PEI, and their interactions with PFAS were evaluated. The effect of pH, ionic strength, and organic solvents on PFAS sorption in aqueous solution was also investigated. The sorbents showed varied adsorption capacities for perfluorooctanoic acid, perfluoropentanoic acid, perfluoro-n-decanoic acid, and hexafluoropropylene oxide dimer acid, with the average extraction capacity of the four analytes being Sepra-WAX-KelF-PEI (523 mg/g) > Sepra-WAX (353 mg/g) > Sepra-WAX-KelF (220 mg/g). Sepra-WAX-KelF-PEI provided the highest adsorption capacity for all analytes tested, proving that the combination of electrostatic and hydrophobic/fluorophilic interactions is crucial for the effective preconcentration of PFAS and its future applications for PFAS remediation from aqueous solutions.

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用于分离全氟烷基物质的碳氟化合物/弱阴离子交换混合模式吸附剂的特性。
全氟烷基和多氟烷基物质(PFAS)在环境中的普遍存在和持久性引起了科学界的关注。目前的研究工作正优先考虑通过具有正交相互作用机制的新型吸附剂来有效修复 PFAS。PFAS 与吸附剂之间公认的吸附机制包括疏水、静电和氟-氟相互作用。这些机制的相互作用大大提高了 PFAS 分离过程中的吸附能力和选择性。在本研究中,对一种伯/仲胺官能化聚苯乙烯-二乙烯基苯(Sepra-WAX)聚合物进行了改性,制成了一种含氟 WAX 树脂(Sepra-WAX-KelF-PEI)。还对合成中间体(Sepra-WAX-KelF)进行了测试,以评估最终产品(Sepra-WAX-KelF-PEI)的改进情况。评估了 Sepra-WAX、Sepra-WAX-KelF 和 Sepra-WAX-KelF-PEI 的吸附能力及其与 PFAS 的相互作用。此外,还研究了 pH 值、离子强度和有机溶剂对水溶液中 PFAS 吸附的影响。吸附剂对全氟辛酸、全氟戊酸、全氟正癸酸和六氟环氧丙烷二聚酸的吸附能力各不相同,四种分析物的平均萃取能力为:Sepra-WAX-KelF-PEI(523 毫克/克)> Sepra-WAX(353 毫克/克)> Sepra-WAX-KelF(220 毫克/克)。Sepra-WAX-KelF-PEI 对所有测试的分析物都具有最高的吸附能力,这证明静电和疏水/亲氟相互作用的结合对于有效预浓缩全氟辛烷磺酸及其在水溶液中修复全氟辛烷磺酸的未来应用至关重要。
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来源期刊
Journal of separation science
Journal of separation science 化学-分析化学
CiteScore
6.30
自引率
16.10%
发文量
408
审稿时长
1.8 months
期刊介绍: The Journal of Separation Science (JSS) is the most comprehensive source in separation science, since it covers all areas of chromatographic and electrophoretic separation methods in theory and practice, both in the analytical and in the preparative mode, solid phase extraction, sample preparation, and related techniques. Manuscripts on methodological or instrumental developments, including detection aspects, in particular mass spectrometry, as well as on innovative applications will also be published. Manuscripts on hyphenation, automation, and miniaturization are particularly welcome. Pre- and post-separation facets of a total analysis may be covered as well as the underlying logic of the development or application of a method.
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