The mercury ion Hg²⁺ is a highly toxic environmental contaminant that threatens both the ecosystem and human health. As such, in recent years, significant effort has been invested in developing novel strategies for ultrasensitive detection of Hg²⁺. Herein, we leveraged the inherent benefits of covalent organic frameworks (COFs) to design a fluorescent COF with the ability to detect Hg²⁺, then synthesized a 2,5-bis(allyloxy)terephthalohydrazide functionalized COF material, called BATHz-Bt, for selective Hg²⁺ recognition. Unlike other methods that rely on sulfur-based ligands, BATHz-Bt is comprised of a π-conjugated framework that serves as the signal transducer; and compact, evenly distributed allyloxy groups that function as the Hg²⁺ acceptor. In addition to the benefits provided by a stable, COF structure, the material is also re-usable, making it reliable, cost effective, and eco-friendly. Furthermore BATHz-Bt showed good detection performance, as evidenced by its high sensitivity, good selectivity, excellent pH stability, and reusability. Moreover, X-ray photoelectron spectroscopy (XPS) confirmed the presence of a robust and selective interaction between the BATHz-Bt allyloxy groups and Hg²⁺. Thus, while this study demonstrates the application potential of fluorescent COFs for Hg²⁺ detection, more importantly, it also provides a new, simple approach to environmental monitoring using functionalized COFs.

汞离子Hg ²⁺是一种剧毒的环境污染物，对生态系统和人类健康均构成威胁。因此，近年来，在开发用于Hg ^2+的超灵敏检测的新策略上已经投入了巨大的努力。本文中，我们利用共价有机框架（COF）的固有优势设计了一种具有检测Hg ²⁺的能力的荧光COF ，然后合成了一种名为BATHz-Bt的2,5-双（烯丙氧基）对苯二酰肼功能化的COF材料，用于选择性的Hg ²⁺识别。与其他依赖硫基配体的方法不同，BATHz-Bt由一个π共轭框架组成，该共轭框架充当信号转换器。和致密，均匀分布的烯丙氧基，起着Hg的作用²⁺受体。除了具有稳定的COF结构所提供的好处外，该材料还可以重复使用，从而使其可靠，具有成本效益并且对环境友好。此外，BATHz-Bt表现出良好的检测性能，其高灵敏度，良好的选择性，出色的pH稳定性和可重复使用性证明了这一点。此外，X射线光电子能谱（XPS）证实了BATHz-Bt烯丙氧基和Hg ²⁺之间存在稳固而选择性的相互作用。因此，尽管这项研究证明了荧光COF在Hg ²⁺检测中的应用潜力，但更重要的是，它也提供了一种新的，简单的方法来使用功能化COF进行环境监测。