Abstract
As one of the most toxic heavy metals to humans and the environment, achieving simultaneous fluorescence detection and effective removal of Hg(2+) presents a significant challenge. In this study, we combined the excellent photoelectric properties of benzothiadiazole groups with the porous structure of covalent organic polymers (COPs) to develop a novel covalent organic polymer material (BTD-MPD-COP) with enhanced fluorescence performance. The benzothiadiazole-modified sites in this material achieved the bifunctional application of BTD-MPD-COP for Hg(2+) fluorescence detection with a detection limit of 35.65 µM and simultaneous removal with a capacity of 475 mg g(-1). Furthermore, BTD-MPD-COP demonstrated remarkable Hg(2+) selectivity and can be reused after desorption without significant reduction in its adsorption capacity. This indicates that BTD-MPD-COP possesses excellent dynamic reversibility in the adsorption of Hg(2+). In summary, the development of functionalized bifunctional covalent organic polymer materials presents an effective strategy for simultaneous removal and detection of toxic heavy metal ions.