State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 200120, China.
Sci Total Environ. 2024 Apr 20;922:171115. doi: 10.1016/j.scitotenv.2024.171115. Epub 2024 Feb 22.
In the current context of water environmental monitoring and pollution control, there's a crucial need for rapid and simple methods to detect multi-pollutant. We herein report an easy one-step hydrothermal synthesis method to produce Eu-based metal-organic frameworks (Eu MOFs), which was used as a fluorescent probe to detect the aquatic environmental pollutants of ciprofloxacin (CIP) and aluminum ions (Al). This fluorescent sensor enabled the cascade detection of CIP and Al through fluorescence enhancement and ratio fluorescence response, respectively. The introduction of CIP significantly turned on the characteristic fluorescence of Eu MOFs at 595 nm and 616 nm through the "antenna effect". Based on this, the sensor enables quantitative detection of CIP within a linear range of 0-120 μM with a LOD as low as 50.421 nM. In the presence of Al, the fluorescence emission of Eu MOFs-CIP was sharply turned off due to strong Al coordination with CIP, while the blue fluorescence emission of CIP was remarkably enhanced. And thus allowing ratio fluorescence quantitative detection of Al (LOD = 2.681 μM). The introduction of CIP and Al in cascade resulted in distinct fluorescence color changes from colorless to red and eventually to blue, exhibiting pronounced fluorescence characteristics. This observable phenomenon enables the visual detection of CIP and Al in both aqueous phase and paper test strips. By combining the analysis of fluorescence chromaticity with the use of a smartphone, the fluorescence color of test papers allows for simple quantitative determination, which provides a convenient and accessible approach for quantifying CIP and Al in water environments.
在当前的水环境保护和污染控制背景下，迫切需要快速、简便的方法来检测多污染物。本文报道了一种简单的一步水热合成方法来制备 Eu 基金属有机骨架（Eu-MOFs），并将其作为荧光探针用于检测环丙沙星（CIP）和铝离子（Al）等水生环境污染物。该荧光传感器通过荧光增强和比率荧光响应分别实现了对 CIP 和 Al 的级联检测。CIP 的引入通过“天线效应”显著开启了 Eu-MOFs 在 595nm 和 616nm 处的特征荧光，基于此，传感器可以在 0-120μM 的线性范围内对 CIP 进行定量检测，检测限低至 50.421nM。在 Al 的存在下，由于 Al 与 CIP 的强配位作用，Eu-MOFs-CIP 的荧光发射被急剧猝灭，而 CIP 的蓝色荧光发射显著增强，从而实现了对 Al 的比率荧光定量检测（检测限=2.681μM）。CIP 和 Al 的级联引入导致荧光颜色从无色变为红色，最终变为蓝色，呈现出明显的荧光特征。这种可观察到的现象使得可以在水相和纸条测试中对 CIP 和 Al 进行可视化检测。通过将荧光色度分析与智能手机的使用相结合，测试纸条的荧光颜色可以进行简单的定量测定，为定量测定水环境中的 CIP 和 Al 提供了一种方便、易用的方法。
