Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents

doi:10.1007/s11783-009-0017-4

Front Envir Sci Eng Chin

0, Vol.

Issue () : 171-177 https://doi.org/10.1007/s11783-009-0017-4

RESEARCH ARTICLE

Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents

Shubo DENG, Danmeng SHUAI, Qiang YU, Jun HUANG, Gang YU(

)

Department of Environmental Science and Engineering, POPs Research Center, and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China

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Abstract

Perfluorooctane sulfonate (PFOS), as a potential persistent organic pollutant, has been widely detected in water environments, and has become a great concern in recent years. PFOS is very stable and difficult to decompose using conventional techniques. Sorption may be an attractive method to remove it from water. In this study, the molecularly imprinted polymer (MIP) adsorbents were prepared through the polymerization of 4-vinylpyridine under different preparation conditions in order to remove perfluorooctane sulfonate (PFOS) from water. The MIP adsorbents using perfluorooctanoic acid (PFOA) as the template had good imprinting effects and could selectively remove PFOS from aqueous solution. The sorption behaviors including sorption kinetics, isotherms, and effect of pH, salt, and competitive anions were investigated. Experimental results showed that the sorption of PFOS on the MIP adsorbents was very fast, pH-dependent, and highly selective. The achieved fast sorption equilibrium within 1 h was attributed to the surface sorption on the fine adsorbents. The sorption isotherms showed that the sorption selectivity of PFOS on the MIP adsorbents decreased at high PFOS concentrations, which may be due to the double-layer sorption and the formation of PFOS micelles on the sorbent surface. The sorption of PFOS on the MIP adsorbents was mainly dominated by the electrostatic interaction between the protonated vinylpyridine on the adsorbent surface and the anionic PFOS. The prepared MIP adsorbents can potentially be applied in water and wastewater treatment for selective removal of PFOS.

Keywords perfluorooctane sulfonate (PFOS) molecularly imprinted polymer (MIP) adsorbents selective sorption electrostatic interaction

Corresponding Author(s): YU Gang,Email:yg-den@tsinghua.edu.cn

Issue Date: 05 June 2009

Cite this article:

Shubo DENG,Qiang YU,Jun HUANG, et al. Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents[J]. Front Envir Sci Eng Chin, 0, (): 171-177.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-009-0017-4
https://academic.hep.com.cn/fese/EN/Y0/V/I/171

Tab.1 Preparation conditions for the MIP and NIP adsorbents

Fig.1 PFOS removal rates using the MIP and NIP adsorbents prepared under different conditions
(Sorption conditions: adsorbent dose = 1 g/L; PFOS concentration = 200 mg/L; pH=5.1; sorption time = 4 h)

Fig.2 Sorption kinetics of PFOS on the MIP and NIP adsorbents at pH 5.1

Fig.3 Effect of solution pH on PFOS removal using the MIP and NIP adsorbents

Fig.4 Sorption isotherms of PFOS on the MIP and NIP adsorbents at pH 5.1

Fig.5 Schematic diagram illustrating the PFOS sorption models on the MIP adsorbents. (a) Hemi-micelle (b) double-layer sorption (c) micelle formation

Fig.6 Effect of ionic NaCl on the sorption of PFOS onto the MIP and NIP adsorbents

Fig.7 Effect of 2,4-D on the sorption of PFOS onto the MIP and NIP adsorbents

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