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Evaluating the Removal of Per- and Polyfluoroalkyl Substances from Contaminated Groundwater with Different Adsorbents Using a Suspect Screening Approach
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2020-10-19 , DOI: 10.1021/acs.estlett.0c00736
Ri Wang 1 , Casey Ching 1 , William R. Dichtel 2 , Damian E. Helbling 1
Affiliation  

Per- and polyfluoroalkyl substances (PFASs) are ubiquitous environmental contaminants. Research has focused on technologies for the removal of perfluoroalkyl acids from water, but contaminated groundwater often contains complex mixtures of diverse groups of PFASs. We explored the potential of five adsorbents to remove mixtures of PFASs from contaminated groundwater. We used high-resolution mass spectrometry to identify 68 unique PFASs in a groundwater sample. We then performed batch experiments with activated carbon (AC), an anion exchange resin, and three different cyclodextrin polymers (CDPs) with varying surface charges to evaluate their potential to remove the 68 PFASs from the groundwater. We found that each adsorbent exhibits a different removal pattern among the 68 PFASs. AC is the most nonselective adsorbent but has relatively slow adsorption kinetics. The CDPs exhibit rapid adsorption kinetics and are more selective than AC, performing better in removing PFAS classes that are complementary to their surface charge. Analysis of the complete data set revealed that adsorption of some PFAS classes can be associated with increasing length of the perfluorinated tail, while adsorption of other classes is more strongly related to properties of the headgroup. Our study offers new insights into PFAS adsorption and a novel approach to evaluate remediation technologies for PFAS removal from groundwater.

中文翻译:

使用可疑筛选方法评估使用不同吸附剂从受污染的地下水中去除全氟和多氟烷基物质的情况

全氟烷基物质和多氟烷基物质(PFAS)是普遍存在的环境污染物。研究集中在从水中去除全氟烷基酸的技术上,但是受污染的地下水通常包含各种PFAS的复杂混合物。我们探索了五种吸附剂从受污染的地下水中去除PFAS混合物的潜力。我们使用高分辨率质谱法鉴定了地下水样品中的68种独特的PFAS。然后,我们使用活性炭(AC),阴离子交换树脂和三种不同表面电荷的不同环糊精聚合物(CDP)进行了批处理实验,以评估其从地下水中去除68种PFAS的潜力。我们发现,在68种PFAS中,每种吸附剂表现出不同的去除方式。AC是最具选择性的吸附剂,但吸附动力学相对较慢。CDP显示出快速的吸附动力学,并且比AC具有更高的选择性,在去除与其表面电荷互补的PFAS类方面表现更好。对完整数据集的分析表明,某些PFAS类别的吸附可能与全氟化尾巴长度的增加有关,而其他类别的吸附与头基团的特性更紧密相关。我们的研究为PFAS吸附提供了新见解,并为评估从地下水中去除PFAS的修复技术提供了一种新颖的方法。对完整数据集的分析表明,某些PFAS类别的吸附可能与全氟化尾巴长度的增加有关,而其他类别的吸附与头基团的特性更紧密相关。我们的研究为PFAS吸附提供了新见解,并为评估从地下水中去除PFAS的修复技术提供了一种新颖的方法。对完整数据集的分析表明,某些PFAS类别的吸附可能与全氟化尾巴长度的增加有关,而其他类别的吸附与头基团的特性更紧密相关。我们的研究为PFAS吸附提供了新见解,并为评估从地下水中去除PFAS的修复技术提供了一种新颖的方法。
更新日期:2020-12-08
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