Nanoporous N‑Rich\nZn Metal–Organic Framework\nand Its Mixed-Matrix Membranes for Turn-On Detection of Norfloxacin\nin River Water and Fingerprint Visualization

Excessive use of antibiotics causes serious environmental\npollution,\nand luminescence sensing can easily and quickly detect trace antibiotic\nresidues in water systems. In this paper, a nanoporous 2D robust Zn-MOF\n(<b>LCU-126</b>) and its mixed-matrix membranes (MMMs) were\nwell fabricated with N-rich functional sites for detecting iota norfloxacin\n(NOR) by a significant luminescence enhancement effect. The efficient\nluminescence sensing performance incorporates high selectivity and\nsensitivity, good anti-interference and recycling stability, fast\nresponse time, and a very low detection limit (LOD) of 0.1007 and\n0.1706 ppb in real river water solutions for <b>LCU-126</b> and\nits MMMs, respectively. Moreover, the luminescent test strips and\nlatent fingerprint visualization further expanded its practical application\nin more convenient, fast, and real-time naked eye monitoring of NOR.\nMultiple experiments and DFT calculations reveal a possible photoinduced\nelectron transfer (PET) luminescence enhancement sensing mechanism.\nThese results evidence that <b>LCU-126</b> is an advanced luminescent\nsensing material for detecting and monitoring NOR antibiotic residues\nin complex real water media.