Thioether-Based Fluorescent Covalent Organic Framework for Selective Detection and Facile Removal of Mercury(II)
Thioether-Based Fluorescent Covalent Organic Framework for Selective Detection and Facile Removal of Mercury(II)
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DOI：
10.1021/jacs.5b10754
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发表时间：
2016-03-09
影响因子：
15
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Ding, San-Yuan;Dong, Ming;Wang, Wei
重金属离子具有很强的毒性，是一种广泛分布的环境污染物。正在开发新的策略来同时检测和去除这些有毒离子。在此，我们利用共价有机框架（COFs）的固有优势，开发用于传感应用的荧光COFs。作为概念验证，硫醚官能化COF材料COF-LZU 8“自下而上”与多功能性集成，用于选择性检测和轻松去除汞（II）：π共轭骨架作为信号传导器，均匀密集分布的硫醚基团作为Hg 2+受体，规则的孔道便于实时检测和传质，以及用于再循环使用的坚固COF结构。COF-LZU 8在高灵敏度、优异的选择性、易观察性和实时响应方面实现了优异的传感性能。同时，COF-LZU 8对水中Hg 2+的高效去除和COF-LZU 8的循环利用为实际应用提供了可能。此外，X射线光电子能谱和固体核磁共振研究证实了Hg 2+和COF-LZU 8的硫醚基团之间的强和选择性的相互作用。这项研究不仅证明了利用荧光COFs的传感和去除金属离子，但也突出了环境应用的功能化COFs的简易构建。
Heavy metal ions are highly toxic and widely spread as environmental pollutants. New strategies are being developed to simultaneously detect and remove these toxic ions. Herein, we take the intrinsic advantage of covalent organic frameworks (COFs) and develop fluorescent COFs for sensing applications. As a proof-of-concept, a thioether-functionalized COF material, COF-LZU8, was "bottom-up" integrated with multifunctionality for the selective detection and facile removal of mercury(II): the pi-conjugated framework as the signal transducer, the evenly and densely distributed thioether groups as the Hg2+ receptor, the regular pores facilitating the real-time detection and mass transfer, together with the robust COF structure for recycle use. The excellent sensing performance of COF-LZU8 was achieved in terms of high sensitivity, excellent selectivity, easy visibility, and real-time response. Meanwhile, the efficient removal of Hg2+ from water and the recycling of COF-LZU8 offers the possibility for practical applications. In addition, X-ray photoelectron spectroscopy and solid-state NMR investigations verified the strong and selective interaction between Hg2+ and the thioether groups of COF-LZU8. This research not only demonstrates the utilization of fluorescent COFs for both sensing and removal of metal ions but also highlights the facile construction of functionalized COFs for environmental applications.