Sorption of perfluorooctane sulfonate and perfluorooctanoate on activated carbons and resin: Kinetic and isotherm study.
Sorption of perfluorooctane sulfonate and perfluorooctanoate on activated carbons and resin: Kinetic and isotherm study.
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DOI：
10.1016/j.watres.2008.12.001
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发表时间：
2009-03
期刊：
影响因子：
12.8
通讯作者：
Qiang Yu;Ruiqi Zhang;S. Deng;Jun Huang;Gang Yu
中科院分区：
文献类型：
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作者：
Qiang Yu;Ruiqi Zhang;S. Deng;Jun Huang;Gang Yu
全氟辛烷磺酸(PFOS)和全氟辛酸(PFOA)因其全球性分布、持久性、较强的生物蓄积性和潜在的毒性，近年来越来越受到全球的关注。研究了粉末活性碳(PAC)、颗粒活性碳(GAC)和阴离子交换树脂(AI400)去除水中全氟辛烷磺酸(PFOS)和全氟辛烷磺酸(PFOA)的吸附动力学和吸附等温线。吸附动力学结果表明，吸附剂粒径对吸附速度影响较大，GAC和AI400达到平衡所需时间均在168h以上，而PAC的达到平衡时间远大于4h。实验数据用两个动力学模型描述，其中准二级模型较好地描述了全氟辛烷磺酸和全氟辛酸在三种吸附剂上的吸附过程。吸附等温线表明，在三种吸附剂中，颗粒炭对全氟辛烷磺酸和全氟辛酸的吸附容量最低，而PAC和AI400对全氟辛烷磺酸和全氟辛酸的吸附容量最大，分别为1.04mmolg−1和2.92mmolg−1。根据吸附行为和吸附材料的特点，推测吸附过程中存在离子交换、静电相互作用和疏水相互作用，并可能在颗粒内形成半胶束和胶束。
Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) have increasingly attracted global concerns in recent years due to their global distribution, persistence, strong bioaccumulation and potential toxicity. The feasibility of using powder activated carbon (PAC), granular activated carbon (GAC) and anion-exchange resin (AI400) to remove PFOS and PFOA from water was investigated with regard to their sorption kinetics and isotherms. Sorption kinetic results show that the adsorbent size influenced greatly the sorption velocity, and both the GAC and AI400 required over 168h to achieve the equilibrium, much longer than 4h for the PAC. Two kinetic models were adopted to describe the experimental data, and the pseudo-second-order model well described the sorption of PFOS and PFOA on the three adsorbents. The sorption isotherms show that the GAC had the lowest sorption capacity both for PFOS and PFOA among the three adsorbents, while the PAC and AI400 possessed the highest sorption capacity of 1.04mmolg−1for PFOS and 2.92mmolg−1for PFOA according to the Langmuir fitting. Based on the sorption behaviors and the characteristics of the adsorbents and adsorbates, ion exchange and electrostatic interaction as well as hydrophobic interaction were deduced to be involved in the sorption, and some hemi-micelles and micelles possibly formed in the intraparticle pores.