The development of a rapid and sensitive method for the detection of fluoride ion (F-) in aqueous systems is of great significance for human health and environmental monitoring. In this study, a zirconium porphyrinic luminescent metal-organic framework (LMOF), PCN-222, was employed as a novel fluorescent probe for the ultrasensitive, rapid and selective detection of F- in water. The PCN-222 probe was prepared by a facile solvothermal method. It exhibited good fluorescence stability and was highly stable in water. The fluorescence emission of PCN-222 could be effectively and selectively quenched by F- due to the strong coordination affinity of F- to the zirconium clusters in PCN-222. The proposed fluorescence method for F- detection based on PCN-222 probe afforded a linear response range of 1-20 μmol/L and a very low detection limit (0.048-0.065 μmol/L) in reference to many reported F- fluorescent probes. Moreover, a rapid response time (<10 s) was obtained due to the open and uniform pore structure of PCN-222 that allowed the fast diffusion of F- to interact with the zirconium recognition sites. Finally, the PCN-222 probe was successfully applied for the fluorescence detection of F- in real water samples. These results highlight the great application potential of LMOF in the sensing fields.

中文翻译：

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使用锆卟啉发光金属有机骨架超灵敏、快速和选择性地检测水溶液中的有害氟离子

开发一种快速、灵敏的检测水性体系中氟离子（F-）的方法，对人类健康和环境监测具有重要意义。在这项研究中，锆卟啉发光金属有机骨架 (LMOF)，PCN-222，被用作一种新型荧光探针，用于超灵敏、快速和选择性地检测水中的 F-。PCN-222 探针是通过简便的溶剂热法制备的。它表现出良好的荧光稳定性并且在水中高度稳定。由于 F- 与 PCN-222 中锆簇的强配位亲和力，PCN-222 的荧光发射可以被 F- 有效和选择性地淬灭。所提出的基于 PCN-222 探针的 F-检测荧光方法提供了 1-20 μmol/L 的线性响应范围和非常低的检测限 (0.048-0. 065 μmol/L) 参考许多报道的 F-荧光探针。此外，由于 PCN-222 的开放且均匀的孔结构允许 F- 快速扩散与锆识别位点相互作用，因此获得了快速响应时间（<10 秒）。最后，PCN-222探针成功应用于真实水样中F-的荧光检测。这些结果凸显了 LMOF 在传感领域的巨大应用潜力。