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A recyclable fluorescent covalent organic framework for exclusive detection and removal of mercury(II)
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.cej.2020.126139
Yanxin Yu , Guoliang Li , Jianghua Liu , Daqiang Yuan

Here, by virtue of the natural merits of covalent organic frameworks (COFs), we report the rational design of a novel reaction-based recyclable fluorescent COF for both sensing and removal applications. The design concept is demonstrated by constructing allyl together with hydroxy groups functionalized COF material, AH-COF, for the exclusive detection and effective removal of mercury (II): the densely and well-distributed allyl cooperated with hydroxy groups as the Hg2+ reaction receptor sites via forming unique mercury-containing product based on the specific mercury-promoted reaction, and the π-conjugation structure as the signal sensor. The satisfactory detection performance of AH-COF was obtained in aspects of excellent uniqueness, high sensitivity, facile visualization, and real-time response. More fascinatingly, AH-COF can be easily recycled in the presence of NaBH4. Moreover, the effective Hg2+ removal from water and the easy recycling of AH-COF provides the potential prospect for actual applications. Furthermore, the solid-state NMR investigations overwhelmingly certified the privileged reaction between Hg2+ and the allyl in cooperation with hydroxy groups of AH-COF. This study not only shows the use of fluorescent COFs for both exclusive detection and facile removal of Hg2+, but also emphasizes a novel design concept for rational structure construction of functionalized COFs for Hg2+ remediation.



中文翻译:

可回收的荧光共价有机框架,用于独家检测和去除汞(II)

在这里,由于共价有机框架(COFs)的天然优点,我们报告了一种新颖的基于反应的可回收荧光COF的合理设计,适用于传感和去除应用。通过将烯丙基与羟基官能化的COF材料AH-COF一起构建来证明设计概念,以专用于检测和有效去除汞(II):密集且分布良好的烯丙基与羟基协同作用,作为Hg 2+通过特定的汞促进反应形成独特的含汞产物,并以π共轭结构作为信号传感器,从而使反应受体得以定位。在出色的独特性,高灵敏度,便捷的可视化和实时响应方面,获得了令人满意的AH-COF检测性能。更令人着迷的是,在NaBH 4存在下,AH-COF可以轻松回收。此外,从水中有效去除Hg 2+以及AH-COF易于回收,为实际应用提供了潜在的前景。此外,固态NMR研究压倒性地证明了Hg 2+之间的特权反应。和烯丙基与AH-COF的羟基配合。这项研究不仅显示了将荧光COF用于Hg 2+的独家检测和简便去除,而且还强调了新颖的设计概念,用于功能化COF的合理结构构建,以修复Hg 2+

更新日期:2020-07-02
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