A Zn(II)-based fluorescent metal–organic framework (MOF) was synthesized and applied as a highly sensitive and quickly responsive chemical sensor for antibiotic detection in simulated wastewater. The fluorescent chemical sensor, denoted FCS-1, exhibited enhanced fluorescence derived from its highly ordered, 3D MOF structure as well as excellent water stability in the practical pH range of simulated antibiotic wastewater (pH = 3.0–9.0). Remarkably, FCS-1 was able to effectively detect a series of sulfonamide antibiotics via photoinduced electron transfer that caused detectable fluorescence quenching, with fairly low detection limits. Two influences impacting measurements related to wastewater treatment and water quality monitoring, the presence of heavy-metal ions and the pH of solutions, were studied in terms of fluorescence quenching, which was nearly unaffected in sulfonamide-antibiotic detection. Additionally, the effective detection of sulfonamide antibiotics was rationalized by the theoretical computation of the energy bands of sulfonamide antibiotics, which revealed a good match between the energy bands of FCS-1 and sulfonamide antibiotics, in connection with fluorescence quenching in this system.

中文翻译：

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荧光金属有机框架（MOF）作为高灵敏度和快速响应的化学传感器，用于检测模拟废水中的抗生素

合成了一种基于Zn（II）的荧光金属有机框架（MOF），并将其作为一种高灵敏，反应灵敏的化学传感器用于模拟废水中的抗生素检测。荧光化学传感器表示为FCS-1，由于其高度有序的3D MOF结构以及在模拟抗生素废水的实际pH范围（pH = 3.0-9.0）中优异的水稳定性，显示出增强的荧光。值得注意的是，FCS-1能够通过光诱导电子转移有效检测出一系列磺酰胺类抗生素，从而引起可检测的荧光猝灭，且检测限较低。从荧光猝灭方面研究了影响废水处理和水质监测相关测量的两个影响，重金属离子的存在和溶液的pH，这在磺胺类抗生素检测中几乎不受影响。此外，通过对磺酰胺类抗生素能带的理论计算合理化了磺酰胺类抗生素的有效检测，这揭示了FCS-1和磺酰胺类抗生素的能带之间的良好匹配，以及该系统中的荧光猝灭。