Removal of perfluorooctane sulfonate from wastewater by anion exchange resins: Effects of resin properties and solution chemistry
Removal of perfluorooctane sulfonate from wastewater by anion exchange resins: Effects of resin properties and solution chemistry
复制标题
通过阴离子交换树脂去除废水中的全氟辛烷磺酸：树脂性能和溶液化学的影响
DOI：
10.1016/j.watres.2010.06.038
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发表时间：
2010-10-01
期刊：
影响因子：
12.8
通讯作者：
Yu, Gang
中科院分区：
文献类型：
--
作者：
Deng, Shubo;Yu, Qiang;Yu, Gang
全氟辛烷磺酸（PFOS）是一种新的持久性有机污染物，其去除是消除其向水环境释放的关键。本文评价了六种具有不同聚合物基质、孔隙率和官能团的阴离子交换树脂对模拟废水中全氟辛烷磺酸的去除效果。树脂基体对PFOS的吸附动力学和吸附容量有显著影响，与聚苯乙烯树脂相比，IRA 67和IRA 958等聚丙烯酸类树脂由于具有亲水性基体，对PFOS的吸附速度更快，吸附容量更大。IRA 67和IRA 958对PFOS的吸附量均在4-5 mmol/g之间，且PFOS在IRA 67和IRA 958树脂上的吸附量大于氯离子的释放量，说明除阴离子交换作用外，树脂对PFOS的吸附还存在其它作用。溶液pH对IRA 958吸附PFOS影响不大，但在pH大于10时，由于胺基的去质子化作用，对IRA 67吸附PFOS有显著影响。废水中共存的硫酸盐和六价铬由于在交换位点上的竞争吸附而干扰了PFOS的吸附。用NaCl和甲醇的混合溶液成功地再生了废树脂。本研究为了解全氟辛烷磺酸在不同阴离子交换树脂上的吸附行为和机理提供了理论依据，为离子交换法去除工业废水中的全氟辛烷磺酸提供了更有效的应用。(C)2010爱思唯尔有限公司保留所有权利。
Perfluorooctane sulfonate (PFOS) is a new persistent organic pollutant of substantial environmental concern, and its removal from industrial wastewater is critical to eliminate its release into water environment. In this paper, six anion exchange resins with different polymer matrix, porosity, and functional group were evaluated for PFOS removal from simulated wastewater. Resin matrix displayed significant effect on the sorption kinetics and capacity of PFOS, and the polyacrylic resins including IRA67 and IRA958 exhibited faster sorption and higher sorption capacity for PFOS than the polystyrene resins due to the hydrophilic matrix. Sorption isotherms illustrated that the sorption capacity of PFOS on IRA67 and IRA958 was up to 4-5 mmol/g, and the amount of PFOS sorbed on the resins was more than chloride released from resins, indicating that other interactions besides anion exchange were involved in the sorption. Solution pH had little impact on the sorption of PFOS on IRA958, but displayed significant effect on IRA67 at pH above 10 due to the deprotonation of amine groups. The coexisting sulfate and hexavalent chromium in wastewater interfered with the sorption of PFOS because of their competitive sorption on the exchange sites. The spent resins were successfully regenerated using the mixture of NaCl and methanol solution. This work provided an understanding of sorption behavior and mechanism of PFOS on different anion exchange resins, and should result in more effective applications of ion exchange for PFOS removal from industrial wastewater. (C) 2010 Elsevier Ltd. All rights reserved.