Macrosurfactant Mediated, Aminopolycarboxy Acid Dictated and Open-cellular Adsorbent for Removing Metal Micropollutants from Water
Macrosurfactant Mediated, Aminopolycarboxy Acid Dictated and Open-cellular Adsorbent for Removing Metal Micropollutants from Water
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用于去除水中金属微污染物的大表面活性剂介导的氨基多羧酸指示的开孔吸附剂
DOI：
10.1039/c9qm00736a
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发表时间：
2020
影响因子：
7
通讯作者：
Decheng Wan
中科院分区：
文献类型：
--
作者：
Shiqi Weng;Ming Jin;Decheng Wan
氨基多羧酸（APA）对重金属具有超强的亲合力。它们的单层、全覆盖、坚固和一步修饰大孔吸附剂表面尚未实现。在目前的工作中，我们得出了一个具有成本效益的战略，以生产多孔吸附剂的援助下，树枝状大分子表面活性剂。以支链聚乙烯亚胺（PEI）与缩水甘油基十六烷基醚（C16）进行部分烷基化反应，得到树枝状聚胺大分子表面活性剂（PEI@C16，Mn ~（104））。这种大分子表面活性剂很好地稳定了油包水高内相乳液（HIPE），而基于线性PEI的大分子表面活性剂对应物的稳定性很差。加热HIPE系统引发PEI@C16的残余胺同时转化为APA和油相（由苯乙烯、二乙烯基苯和自由基引发剂组成）转化为开孔固体基质。所得的开孔整料显示出相当大的比表面积和对水中各种重金属离子的非常高的亲和力。Pb（II）的吸附遵循化学吸附和单分子层吸附机理。吸附剂表现出良好的可回收性，由于稳固锚定的APA。
Aminopolycarboxy acids (APAs) are well known for their ultrastong affinity for heavy metals. Their monolayer, full-coverage, robust and one-step decoration of the surface of a macroporous adsorbent has not yet been realized. In the current work, we derived a cost-effective strategy to produce a porous adsorbent with the aid of a dendritic macrosurfactant. Branched polyethylenimine (PEI) was partly alkylated with glycidyl cetylether (C16) to form a dendritic polyamine macrosurfactant (PEI@C16, Mn ∼ 104). This macrosurfactant well stabilized a water-in-oil high internal phase emulsion (HIPE), while a macrosurfactant counterpart based on linear PEI did so poorly. Heating the HIPE system triggered a simultaneous transformation of the residual amines of PEI@C16 into APAs and of the oil phase (consisting of styrene, divinylbenzene and radical initiator) into an open-cellular solid matrix. The resulting open-cellular monolith showed a rather large specific surface area and very high affinity for various heavy metal ions in water. The adsorption of Pb(II) was indicated to follow a chemical and monolayer adsorption mechanism. The adsorbent showed good recyclability, due to the robustly anchored APAs.