A crosslinked β-cyclodextrin polymer used for rapid removal of a broad-spectrum of organic micropollutants from water
A crosslinked β-cyclodextrin polymer used for rapid removal of a broad-spectrum of organic micropollutants from water
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一种交联 β-环糊精聚合物，用于快速去除水中的广谱有机微污染物
DOI：
10.1016/j.carbpol.2017.08.059
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发表时间：
2017-12-01
影响因子：
11.2
通讯作者：
Zhu, Liping
中科院分区：
文献类型：
--
作者：
Wang, Zhanghui;Zhang, Peibin;Zhu, Liping
水环境中的增塑剂、农药、药品等有机微污染物已对人类健康构成严重威胁，成为人类面临的重大挑战。传统的水处理技术对低浓度的有机微污染物不能达到很高的去除效率。在这里，我们展示了一种不溶于水的交联β-环糊精（β-CD）聚合物，能够通过快速吸附从水中去除广谱的有机微污染物。通过β-CD羟基和4，4 '-二氟二苯砜的亲核芳族取代合成了一类β-CD聚合物（β-CDPs）。采用静态或动态吸附法对水中多种有机微污染物进行吸附。结果表明，进水通过β-CDPs柱后，水中99%以上的微污染物被去除。静态吸附实验结果表明，该树脂对双酚A的吸附速度快，吸附容量高（最大吸附量为113.0mg/g β-CDP）。吸附过程符合准二级动力学和Langmuir等温吸附模型，表明其主要为单分子层化学吸附。β-环糊精不溶于水的特性便于其在吸附饱和后从处理液中分离，以再生和重复使用。经过5次过滤-再生循环后，β-CDPs的吸附能力几乎保持不变。
Organic micropollutants in aquatic environment such as plasticizer, pesticide and pharmaceuticals, have posed a serious threat to human health and are emerging as a great challenge to humanity. Traditional water treatment techniques fail to achieve high removal efficiency for low concentration of organic micropollutants. Here we demonstrate a water-insoluble crosslinked beta-cyclodextrin (beta-CD) polymer able to remove a broad-spectrum of organic micropollutants from water by rapid adsorption. A family of beta-CD polymers (beta-CDPs) were synthesized by nucleophilic aromatic substitution of beta-CD hydroxyl groups and 4,4'-difluorodiphenylsulfone. The beta-CDPs were used to adsorb various organic micropollutants in water by static or dynamic adsorption process. It was found that more than 99% micropollutants in water were removed by flowing the feed water through the column of beta-CDPs. The results of static adsorption experiments indicated the adsorption process was fast and the adsorption capacity was very high (the maximal value was 113.0 mg of bisphenol A per gram of beta-CDP). The adsorption process was fitted well with the quasi-second-order kinetics and the Langmuir isothermal adsorption model, suggesting that it is mainly a chemical adsorption of monolayer. The water-insoluble characteristic of the beta-CDPs is convenient for their separation from the treated solution after adsorption saturation for regeneration and reuse. The adsorption ability of beta-CDPs was kept nearly unchanged after five filtration-regeneration cycles.