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β-cyclodextrin polymers with different crosslinkers and ion exchange resins exhibit variable adsorption of anionic, zwitterionic, and non-ionic PFASs.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-14 , DOI: 10.1021/acs.est.0c04028
Casey Ching 1 , Max J Klemes 2 , Brittany Trang 2 , William R Dichtel 2 , Damian E Helbling 1
Affiliation  

Per- and polyfluoroalkyl substances (PFASs) occur in groundwater as mixtures of anionic, cationic, zwitterionic, and nonionic species, although few remediation technologies have been evaluated to assess the removal of different types of PFASs. In this study, we evaluated the performance of three β-cyclodextrin polymers (CDPs), an anion-exchange (AE) resin, and a cation-exchange (CE) resin for the removal of anionic, zwitterionic, and nonionic PFASs from water. We found that a CDP with a negative surface charge rapidly removes all zwitterionic PFASs with log KD values ranging between 2.4 and 3.1, and the CE resin rapidly removes two zwitterionic PFASs with log KD values of 1.8 and 1.9. The CDPs with a positive surface charge rapidly remove all anionic PFASs with log KD values between 2.7 and 4.1, and the AE resin removes all anionic PFASs relatively slowly with log KD values between 2.0 and 2.3. All adsorbents exhibited variable removal of the nonionic PFASs and some adsorption inhibition at higher pH values and in the presence of groundwater matrix constituents. Our findings provide insight into how adsorbents can be combined to remediate groundwater contaminated with complex mixtures of different types of PFASs.

中文翻译:

具有不同交联剂和离子交换树脂的β-环糊精聚合物表现出对阴离子,两性离子和非离子PFAS的可变吸附。

全氟烷基物质和多氟烷基物质(PFAS)以阴离子,阳离子,两性离子和非离子物质的混合物形式存在于地下水中,尽管很少有人评估修复技术来评估不同类型PFAS的去除情况。在这项研究中,我们评估了三种β-环糊精聚合物(CDP),阴离子交换(AE)树脂和阳离子交换(CE)树脂从水中去除阴离子,两性离子和非离子PFAS的性能。我们发现具有负表面电荷的CDP迅速去除了log K D值在2.4和3.1之间的所有两性离子PFAS ,而CE树脂迅速去除了log K D的两个两性离子PFAS。值1.8和1.9。具有正表面电荷的CDP会快速去除log K D值在2.7和4.1之间的所有阴离子PFAS,而AE树脂相对较慢地去除log K D值在2.0和2.3之间的所有阴离子PFAS 。在较高的pH值和存在地下水基质成分的情况下,所有吸附剂均表现出非离子型PFAS的可变去除和某些吸附抑制作用。我们的发现提供了有关吸附剂如何结合以补救被不同类型PFAS的复杂混合物污染的地下水的见解。
更新日期:2020-10-06
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