吸附
吸附
全氟辛烷
化学
磺酸盐
朗缪尔吸附模型
活性炭
胶束
离子交换
化学工程
环境化学
无机化学
有机化学
离子
水溶液
钠
工程类
作者
Qiang Yu,Ruiqi Zhang,Shubo Deng,Jun Huang,Gang Yu
出处
期刊:Water Research
[Elsevier]
日期:2008-12-14
卷期号:43 (4): 1150-1158
被引量:712
标识
DOI:10.1016/j.watres.2008.12.001
摘要
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(-1) for PFOS and 2.92mmolg(-1) for 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.
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