Seeking novel materials with simultaneous task-specific recognition and enrichment for trace pollutants is of great significance for environmental security. Here, we developed a sulfonate-based covalent organic framework (sCOF) for the fast detection of tetracycline hydrochloride (TCH). For the first time, we visually demonstrated by molecular simulation that the incorporation of disulfonic acid in COF facilitates self-exfoliation due to multiple roles of fluorophore, steric hindrance and interlayered water receptor. The exfoliated fluorescent covalent organic nanosheets (f-sCON) exhibit superior sensitivity to TCH residuals in aqueous solution and can be engineered into a naked-eye fluorescent device of f-sCON-gel. Owing to the high capacity and rapid kinetics of bulk sulfonate-COF towards TCH, simultaneous TCH removal and detection are achieved in a continuous flow mixed column of sulfonate-COF adsorbent and f-sCON-gel. We believe this facile self-exfoliation provides a promising strategy for simultaneously achieving the long-sought-after dual functions of recognition and encapsulation in one system.

中文翻译：

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设计具有识别和包封双重功能的磺酸盐基共价有机框架

寻找同时对痕量污染物进行特定任务识别和富集的新型材料对环境安全具有重要意义。在这里，我们开发了一种基于磺酸盐的共价有机骨架 (sCOF)，用于快速检测四环素盐酸盐 (TCH)。我们首次通过分子模拟直观地证明，由于荧光团、位阻和层间水受体的多重作用，在 COF 中掺入二磺酸促进了自剥离。剥离的荧光共价有机纳米片 (f-sCON) 对水溶液中的 TCH 残留物表现出优异的敏感性，可以设计成 f-sCON-gel 的裸眼荧光装置。由于本体磺酸盐-COF对TCH的高容量和快速动力学，在磺酸盐-COF 吸附剂和 f-sCON-凝胶的连续流动混合柱中实现同时去除和检测 TCH。我们相信这种简便的自我剥离提供了一种有前途的策略，可以在一个系统中同时实现长期寻求的识别和封装双重功能。