Confined Flocculation of Ionic Pollutants by Poly(L-dopa)-Based Polyelectrolyte Complexes in Hydrogel Beads for Three-Dimensional, Quantitative, Efficient Water Decontamination.
Confined Flocculation of Ionic Pollutants by Poly(L-dopa)-Based Polyelectrolyte Complexes in Hydrogel Beads for Three-Dimensional, Quantitative, Efficient Water Decontamination.
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DOI：
10.1021/acs.langmuir.5b01084
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Li Yu;Xiaokong Liu;Weichang Yuan;Lauren Joan Brown;Dayang Wang
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文献类型：
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作者：
Li Yu;Xiaokong Liu;Weichang Yuan;Lauren Joan Brown;Dayang Wang
开发简单、可回收的高吸附容量吸附剂是水处理技术的当务之急。在这项工作中，我们已经成功地开发了新的吸附剂，用于去除离子污染物从水中通过封装的双金属络合物（佩奇）由带正电荷的聚（烯丙胺盐酸盐）（PAH）和带负电荷的聚（1 - 3，4-二羟基苯丙氨酸）（PDopa），通过1 - 3，4-二羟基苯丙氨酸（1-多巴）的自聚合获得。由于通过水凝胶主体基质的出色的质量传输，内部负载的PDopa-PAH PEC客体可以有效地从水中去除各种离子污染物，包括重金属离子和离子有机染料。PDopa-PAH佩奇的吸附效率可以与PDopa-PAH摩尔比定量相关并通过PDopa-PAH摩尔比定制。由于PDopa在每个重复单元中包含一个儿茶酚基团、一个羧基和一个氨基，因此与可用的吸附剂相比，所得的PDopa-PAH佩奇表现出最大的重金属离子吸附能力。由于PDopa和PAH都是pH敏感性的，因此在通过调节周围介质的pH吸附离子污染物之后，PDopa-PAH PEC负载的琼脂糖水凝胶珠可以容易且完全地回收。本发明的策略类似于使用佩奇从水中絮凝离子污染物的常规方法，而在我们的系统中，絮凝仅限于琼脂糖水凝胶珠，从而允许容易地将所得吸附剂从水中分离。
The development of simple and recyclable adsorbents with high adsorption capacity is a technical imperative for water treatment. In this work, we have successfully developed new adsorbents for the removal of ionic pollutants from water via encapsulation of polyelectrolyte complexes (PECs) made from positively charged poly(allylamine hydrochloride) (PAH) and negatively charged poly(l-3,4-dihydroxyphenylalanine) (PDopa), obtained via the self-polymerization of l-3,4-dihydroxyphenylalanine (l-Dopa). Given the outstanding mass transport through the hydrogel host matrixes, the PDopa-PAH PEC guests loaded inside can effectively and efficiently remove various ionic pollutants, including heavy metal ions and ionic organic dyes, from water. The adsorption efficiency of the PDopa-PAH PECs can be quantitatively correlated to and tailored by the PDopa-to-PAH molar ratio. Because PDopa embodies one catechol group, one carboxyl group, and one amino group in each repeating unit, the resulting PDopa-PAH PECs exhibit the largest capacity of adsorption of heavy metal ions compared to available adsorbents. Because both PDopa and PAH are pH-sensitive, the PDopa-PAH PEC-loaded agarose hydrogel beads can be easily and completely recovered after the adsorption of ionic pollutants by adjusting the pH of the surrounding media. The present strategy is similar to the conventional process of using PECs to flocculate ionic pollutants from water, while in our system flocculation is confined to the agarose hydrogel beads, thus allowing easy separation of the resulting adsorbents from water.