阴离子交换树脂对典型及新型全氟/多氟烷基酸的吸附去除  

Adsorption characteristics of legacy and emerging per-and polyfluoroalkyl acids(PFAAs)on anion exchange resin

作　　者：李霞[1] 曹溢 方博 张连营 陈浩[2] 孙红文[2] Xia Li;Yi Cao;Bo Fang;Lianying Zhang;Hao Chen;Hongwen Sun(School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China;Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria,College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]天津理工大学环境科学与安全工程学院,天津300384 [2]南开大学环境科学与工程学院,教育部环境污染过程与基准重点实验室,天津300350

出　　处：《科学通报》2024年第14期1934-1944,共11页Chinese Science Bulletin

基　　金：国家重点研发计划(2022YFC3703201);国家自然科学基金(22006074,22036004,42161134001);高等学校学科创新引智计划(T2017002)资助。

摘　　要：全氟/多氟烷基酸类物质(PFAAs)作为一类优良的表面活性剂被广泛应用于纺织、半导体和航天等多种商业和工业领域,造成了水体中PFAAs的严重污染.常规饮用水处理工艺如絮凝、高级氧化等不能有效去除PFAAs,而离子交换树脂仅能去除传统的长链PFAAs,对于短链替代物C4 PFAAs和全/多氟醚羧酸的去除效果仍然未知.因此,本研究选取不同链长和官能团的PFAAs,探究不同结构PFAAs的吸附动力学特征,以及树脂性质和水化学条件(溶液pH、共存污染物、无机盐离子)对阴离子交换树脂(AERs)吸附去除不同结构PFAAs的影响特征及关键控制因素.结果表明, PFAAs在大孔AERs(A860)上的吸附速率更快,而凝胶型高憎水性的聚苯乙烯基树脂(A600)对PFAAs的吸附容量和去除率更高. PFAAs链长及官能团的电负性对其吸附速率和去除率均有较大影响:相同碳链长度下,全氟磺酸(PFSAs)>全氟羧酸(PFCAs).对于含有相同官能团的PFAAs,短链PFAAs的吸附速率高于长链PFAAs.溶液pH对PFAAs在树脂上的吸附影响较小.短链PFAAs在AERs上的吸附主要受离子交换作用控制,易受无机盐离子干扰.憎水性较强的PFAAs在树脂上的吸附除静电作用外,主要受憎水性分配的控制.常规的AERs难以有效去除水体中亲水性较强的短链PFCAs(C<4)和全氟醚羧酸(如GenX),因此这些新型PFAAs替代物给未来的水处理工作带来了极大挑战.Per- and polyfluoroalkyl acids (PFAAs) exhibit remarkable surfactant properties, contributing to their widespread use indiverse commercial and industrial applications, and subsequent contamination of water environments. Conventionaldrinking water treatment methods, such as coagulation and advanced oxidation processes have encountered challenges ineffectively eliminating these persistent contaminants, necessitating the exploration of alternative approaches. While anionexchange resins (AERs) have proven effective in removing long-chain PFAAs, their efficacy in addressing alternativeforms of these legacy PFAAs, such as short-chain C4 PFAAs, and per- and polyfluoroalkyl ether carboxylic acids andsulfonic acids (PFECAs and PFESAs), remains uncertain.Trifluoroacetic acid (TFA), trifluoromethane sulfonic acid (TFMS), perfluorobutanoic acid (PFBA), and perfluorobutanesulfonic acid (PFBS) were chosen as representative short-chain perfluorocarboxylic acids (PFCAs) and perfluorosulfonicacids (PFSAs). Additionally, sodium p-perfluorous nonenoxybenzenesulfonate (OBS) and perfluoro-2-propoxypropanoicacid (GenX) were selected to represent emerging PFECAs and PFESAs. To provide a basis for comparison, the sorption oftwo legacy PFAAs, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), were also examined. Thisstudy investigates the impacts of PFAA structural features (carbon chain length and terminal functional group), resinproperties (composition and structure), and solution chemistry factors (pH, co-occurring contaminants, inorganic ions, andsalinity) on the removal of both legacy and emerging PFAAs by AERs.Results demonstrate that the adsorption rate of PFAAs on the macroporous resin (A860) surpasses that on gel (G) resin,with observed desorption of TFA on the macroporous resin. However, the G resin, characterized by a hydrophobicpolystyrene (PS) composition, exhibits a higher adsorption capacity and removal rate for PFAAs compared to macroporous(MP) resins with a polyacrylic (PA) composition (adsorption ca

关 键 词：全氟/多氟烷基酸 短链全氟烷基酸 离子交换树脂 竞争吸附 

分 类 号：X703[环境科学与工程—环境工程]