Comparison of the sorption behaviors and mechanisms of perfluorosulfonates and, perfluorocarboxylic acids on three kinds of clay minerals

被引：181
作者：
Zhao, Lixia [1 ]
Bian, Jingna [1 ]
Zhang, Yahui [2 ]
Zhu, Lingyan [1 ]
Liu, Zhengtao [2 ]
机构：
[1] Nankai Univ, Coll Environm Sci & Engn, Tianjin Key Lab Environm Remediat & Pollut, Key Lab Pollut Proc & Environm Criteria,Minist Ed, Tianjin 300071, Peoples R China
[2] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China
来源：
CHEMOSPHERE | 2014年 / 114卷
关键词：
Perfluoroalkyl acids (PFAAs); Sorption mechanisms; Clay minerals; Electrostatic interaction; Complexation; Hydrogen bonding; IRON-OXIDE SURFACES; PERFLUOROOCTANE SULFONATE; PERFLUORINATED COMPOUNDS; QUANTITATIVE-DETERMINATION; MASS-SPECTROMETRY; AQUEOUS-SOLUTION; ADSORPTION; WATER; DESORPTION; SEDIMENTS;
D O I：
10.1016/j.chemosphere.2014.03.098
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The sorption of four perfluoroalkyl acids (PFAAs) [perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS), perfluorooctanoic acid (PFOA) and perfluorohexanoic acid (PFHxA)] on three typical minerals [montmorillonite (MM), kaolinite (KL) and hematite (HM)] was studied. The sorption of PFOS and PFHxS was much stronger than PFOA and PFHxA. The sorption of each PFAA on the minerals followed an order of HM > ML> MM, even though MM was positively while ML and HM were negatively charged, implying that the sorption is driven by some other interactions besides electrostatic attraction. The sorption decreased with an increase in pH and a decrease in ionic strength of the solution, and their impacts on PFOS were much stronger than other three PFAAs. Surface complexing and hydrogen-bonding could make great contributions to the sorption of PFOS on the minerals. The results are important for understanding the transport and fate of PFAAs in sediment and ground water. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：51 / 58
页数：8
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