The influence of surfactant and solution composition on PFAS adsorption at fluid-fluid interfaces
The influence of surfactant and solution composition on PFAS adsorption at fluid-fluid interfaces
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DOI：
10.1016/j.watres.2019.05.095
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发表时间：
2019-09-15
期刊：
影响因子：
12.8
通讯作者：
Van Glubt, Sarah
中科院分区：
文献类型：
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作者：
Brusseau, Mark L.;Van Glubt, Sarah
本研究的目的是研究表面活性剂和溶液组成对PFAS在流体-流体界面吸附的影响。测量了所选PFAS以及代表性烃表面活性剂的表面张力。这些数据补充了从文献中收集的数据集。研究了表面活性剂头基电荷，特别是两性离子PFAS的影响。研究了表面活性剂对离子型PFAS的影响以及头基大小对非离子型PFAS的影响。此外，溶液的离子组成，离子强度和pH值的影响进行了检查。共溶质的影响，特别是乙醇，腐殖酸，三氯乙烯，也进行了检查，以及PFAS混合物和氟碳烃表面活性剂混合物的行为。最近开发的QSPR模型的框架内的数据进行了解释，以预测流体-流体界面吸附系数（Ki）的PFAS。结果表明，所有研究的因素都对K-i值有一定程度的影响。因此，土壤孔隙水和地下水的组成可能会影响PFAS吸附在空气-水和有机液-水界面的大小。然而，在较低的PFAS浓度下（小于1-10 mg/L），所研究的大多数因素对K-i的影响较小。因此，它们对流体-流体界面吸附的影响可能在代表许多环境系统的低PFAS浓度下相对较小，特别是与其他因素如流体饱和度、多孔介质性质和PFAS分子结构的影响相比。研究结果表明，修正后的QSPR模型为环境体系中广泛的PFAS提供了合理的K-i一阶预测。(C)2019爱思唯尔有限公司版权所有。
The objective of this research is to examine the influence of surfactant and solution composition on PFAS adsorption at fluid-fluid interfaces. Surface tensions were measured for select PFAS, as well as a representative hydrocarbon surfactant. These data are supplemented with data sets collected from the literature. The influence of surfactant headgroup charge, specifically for zwitterionic PFAS, was investigated. The impacts of surfactant counterion for ionic PFAS and the influence of headgroup size for nonionic PFAS were also investigated. In addition, the influence of solution ion composition, ionic strength, and pH was examined. The impact of co-solutes, specifically ethanol, humic acid, and trichloroethene, was also examined, as well as the behavior of PFAS mixtures and fluorocarbon-hydrocarbon surfactant mixtures. The data were interpreted within the framework of a QSPR model recently developed to predict fluid-fluid interfacial adsorption coefficients (K-i) of PFAS. The results demonstrate that all of the factors investigated have some degree of impact on K-i values. Thus, the composition of soil-pore water and groundwater is likely to affect the magnitude of PFAS adsorption at air-water and organic liquid-water interfaces. However, the influence on K-i of most of the factors investigated is small for lower PFAS concentrations (less than similar to 1-10 mg/L). Hence, their impacts on fluid-fluid interfacial adsorption are likely to be relatively minor at the low PFAS concentrations representative of many environmental systems, especially compared to the impact of other factors such as fluid saturations, porous-medium properties, and PFAS molecular structure. The results of this study indicate that the revised QSPR model provides reasonable first-order predictions of K-i for a wide range of PFAS in environmental systems. (C) 2019 Elsevier Ltd. All rights reserved.