Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents |
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Authors: | Shubo Deng Danmeng Shuai Qiang Yu Jun Huang and Gang Yu |
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Institution: | (1) 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. |
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Keywords: | perfluorooctane sulfonate (PFOS) molecularly imprinted polymer (MIP) adsorbents selective sorption electrostatic interaction |
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