Selective removal of perfluorooctane sulfonate from aqueous solution using chitosan-based molecularly imprinted polymer adsorbents
Selective removal of perfluorooctane sulfonate from aqueous solution using chitosan-based molecularly imprinted polymer adsorbents
复制标题
使用基于壳聚糖的分子印迹聚合物吸附剂从水溶液中选择性去除全氟辛烷磺酸
DOI：
10.1016/j.watres.2008.02.024
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发表时间：
2008-06-01
期刊：
影响因子：
12.8
通讯作者：
Yu, Gang
中科院分区：
文献类型：
--
作者：
Yu, Qiang;Deng, Shubo;Yu, Gang
水环境中的全氟辛烷磺酸（PFOS）污染是全球关注的问题。以全氟辛烷磺酸（PFOS）为模板分子，采用环氧氯丙烷（ECH）交联壳聚糖制备了一种新型的分子印迹聚合物（MIP）。在MIP吸附剂的制备过程中，模板用量和交联剂对印迹效果有显著影响。优化后的印迹聚合物吸附剂对PFOS的吸附量为560 μ molg（-1），而非印迹聚合物（NIP）的吸附量仅为258 μ molg（-1）。详细研究了MIP吸附剂的吸附动力学、吸附等温线、pH值、离子强度对吸附的影响以及选择性吸附。吸附实验结果表明，MIP吸附剂对PFOS具有较好的选择性，而其他不同结构的阴离子污染物对PFOS的吸附影响不大。结果表明，静电相互作用在吸附过程中对目标化合物的识别起着重要作用。此外，MIP吸附剂可以使用至少五次而没有任何吸附容量的损失。壳聚糖基MIP吸附剂在水或废水处理中选择性去除PFOS具有潜在的应用前景。(c)2008爱思唯尔有限公司保留所有权利。
Perfluorooctane sulfonate (PFOS) pollution in aqueous environment is a problem of global concern. A novel chitosan-based molecularly imprinted polymer (MIP) was prepared by crosslinking with epichlorohydrin (ECH) in the presence of PFOS as the template. During the preparation of the MIP adsorbents, the template amount and crosslinking agents significantly affected the imprinting effect. The optimized MIP adsorbents had a sorption amount of 560 mu mol g(-1) for PFOS, while the sorption amount of the non-imprinted polymer (NIP) was only 258 mu molg(-1). The sorption behaviors of the MIP adsorbents including sorption kinetics, isotherms, effect of pH, ionic strength and selective sorption were investigated in detail. Sorption experimental results showed that the MIP adsorbents had good selectivity for PFOS, while other anionic contaminants with different structure had little influence on the sorption of the target PFOS. It was found that the electrostatic interaction played an important role in recognizing the target compound in the sorption process. Additionally, the MIP adsorbents could be used at least five times without any loss in sorption capacity. The chitosan-based MIP adsorbents may find potential application in water or wastewater treatment for the selective removal of PFOS. (c) 2008 Elsevier Ltd. All rights reserved.