Water pollution has attracted worldwide significant attention ever since the finding of its harmful effects on the whole ecosystem, including human health. Although several materials are known for selective removal of specific contaminants, designing a single material that can adsorb a variety of water contaminants is still a very challenging task due to a lack of proper design strategies. Herein, we have rationally designed a new class of anion exchangeable hybrid material where the nanosized cationic metal–organic polyhedra (MOP) are embedded inside a porous covalent organic framework (COF) with specific binding sites for toxic oxoanions. The resulting hybrid material exhibits very fast and selective sequestration of high as well as trace amount of a wide range of toxic oxoanions (HAsO₄^2–, SeO₄^2–, CrO₄^2–, ReO₄^–, and MnO₄^–) from the mixture of excessive (∼1000-fold) other interfering anions to well below the permissible drinking water limit. Moreover, the hybrid cationic nanotrap material can reduce the As(V) level from a highly contaminated groundwater sample to below the WHO permitted level.

中文翻译：

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纳米阱接枝阴离子可交换杂化材料，可有效去除水中的有氧氧阴离子

自从发现水污染对整个生态系统（包括人类健康）的有害影响以来，水污染就引起了全世界的广泛关注。尽管已知有几种材料可以选择性地去除特定的污染物，但是由于缺乏适当的设计策略，设计一种可以吸附多种水污染物的材料仍然是一项非常具有挑战性的任务。在这里，我们合理设计了一种新型的阴离子可交换杂化材料，其中纳米级阳离子金属有机多面体（MOP）嵌入具有特定结合位点的有毒含氧阴离子的多孔共价有机骨架（COF）内。所得的杂化材料表现出非常快速和选择性的螯合，可分离出高含量和痕量的多种有毒含氧阴离子（HAsO ₄ ^2–，SeO₄ ^2–，CrO ₄ ^2–，ReO ₄ ^–和MnO ₄ ^–）是由过量（约1000倍）其他干扰性阴离子的混合物组成，远远低于允许的饮用水极限。此外，杂化阳离子纳米阱材料可以将高污染地下水样品中的As（V）含量降低到WHO允许水平以下。