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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of a perfluorooctanoic acid molecularly imprinted polymer for the selective removal of perfluorooctanoic acid in an aqueous environment
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Synthesis of a perfluorooctanoic acid molecularly imprinted polymer for the selective removal of perfluorooctanoic acid in an aqueous environment

机译：全氟辛酸分子印迹聚合物的合成，用于在水性环境中选择性去除全氟辛酸

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Perfluorooctanoic acid (PFOA) contamination in the environment is a global problem. The aqueous phase is the main medium for PFOA because of its moderate solubility. Adsorption is a feasible way to remove PFOA because of its chemical and biological stability. In this study, a new type of molecularly imprinted polymer (MIP) for the selective adsorption of PFOA in aqueous solutions was synthesized by the precipitation polymerization method with PFOA as the template molecule after optimization. The adsorption kinetics and isotherms of the MIP adsorbent toward PFOA were studied, and the effects of the pH and cations on the adsorption were investigated with batch experiments. The results show that acrylamide (AAM) was the best functional monomer, and the optimal molar ratio of PFOA to AAM to ethylene glycol dimethacrylate (crosslinker) was 1:6:25. The optimized MIP adsorbent had a high affinity for PFOA, and the uptake percentage by the MIP adsorbent was 1.3-2.5 times that of the nonimprinted polymer (NIP) when PFOA existed alone. A maximum PFOA sorption capacity of 5.45 mg/g based on the Langmuir isotherm model was achieved with the MIP adsorbent. The MIP adsorbent exhibited a high selectivity for PFOA over competitive compounds (other perfluorinated alkyl carboxylic and sulfonic acids), whereas the NIP did not. Approximately 90% of the PFOA in the mixture was removed by the MIP adsorbent; this was 18 times that of the NIP. Moreover, the regenerability of the MIP adsorbent was confirmed in five sequential adsorption-desorption cycles without a significant reduction in the PFOA uptake. (c) 2016 Wiley Periodicals, Inc.
机译：环境中的全氟辛酸（PFOA）污染是一个全球性问题。由于其适度的溶解性，水相是PFOA的主要介质。由于其化学和生物稳定性，吸附是去除PFOA的可行方法。本研究通过沉淀聚合法，以PFOA为模板分子，经过优化后，合成了一种新型的分子印迹聚合物（MIP），用于PFOA在水溶液中的选择性吸附。研究了MIP吸附剂对PFOA的吸附动力学和等温线，并通过分批实验研究了pH和阳离子对吸附的影响。结果表明，丙烯酰胺（AAM）是最佳的功能单体，PFOA与A​​AM与乙二醇二甲基丙烯酸酯（交联剂）的最佳摩尔比为1：6：25。优化的MIP吸附剂对PFOA具有高亲和力，当单独存在PFOA时，MIP吸附剂的吸收百分比是非印迹聚合物（NIP）的1.3-2.5倍。使用MIP吸附剂，基于Langmuir等温模型，最大PFOA吸附容量为5.45 mg / g。与竞争性化合物（其他全氟化烷基羧酸和磺酸）相比，MIP吸附剂对PFOA具有高选择性，而NIP则没有。混合物中约90％的PFOA被MIP吸附剂去除;这是NIP的18倍。而且，在五个连续的吸附-解吸循环中证实了MIP吸附剂的可再生性，而PFOA的吸收量并未显着降低。 （c）2016年威利期刊有限公司

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