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<p>The residue of malachite green (MG) in water has serious toxic effects on the human body, so it is very important to establish a highly sensitive and convenient method for MG detection. In this study, a novel double-emission lanthanide MOF fluorescence probe (Eu-Zn-MOF) was designed for monitoring MG in water by post-synthetic modification (PSM) to Zn-MOF synthesized by a simple hydrothermal method. Eu-Zn-MOF exhibits excellent photoluminescence properties, making it suitable as a ratiometric fluorescence sensor (<i>I</i><sub>410</sub>/<i>I</i><sub>615</sub>) for the sensitive detection of MG. MG effectively quenches the luminescence of Eu<sup>3+</sup> at 615&#xa0;nm, while the luminescence of the Zn-MOF frame at 410&#xa0;nm remains unaltered. The fluorescence sensing platform had a relatively wide linear range (0–30&#xa0;µM), low detection limit (9.8&#xa0;nM), high sensitivity, and rapid response time (within 1&#xa0;min). At the same time, the recovery of actual samples was 90.2–107.0%, and the relative standard deviation (RSD) was ≤&#xa0;3.82%. Simultaneously, by combining the smartphone color recognition APP with RGB analysis, a portable smartphone auxiliary sensing platform was established to realize the visual detection of MG. This method provides a novel strategy for real-time monitoring of pollutants in the environment.</p> Graphical Abstract <p></p>

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A rapid on-site fluorescence sensing platform for malachite green in an aqueous phase based on lanthanide-functionalized MOF

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Yu Yan,
  • Hao Guo,
  • Zhiguo Yu,
  • Zeyun Yang,
  • Dengke Zhuang,
  • Yanyan Ma,
  • Mingyue Wang,
  • Wu Yang

摘要

The residue of malachite green (MG) in water has serious toxic effects on the human body, so it is very important to establish a highly sensitive and convenient method for MG detection. In this study, a novel double-emission lanthanide MOF fluorescence probe (Eu-Zn-MOF) was designed for monitoring MG in water by post-synthetic modification (PSM) to Zn-MOF synthesized by a simple hydrothermal method. Eu-Zn-MOF exhibits excellent photoluminescence properties, making it suitable as a ratiometric fluorescence sensor (I410/I615) for the sensitive detection of MG. MG effectively quenches the luminescence of Eu3+ at 615 nm, while the luminescence of the Zn-MOF frame at 410 nm remains unaltered. The fluorescence sensing platform had a relatively wide linear range (0–30 µM), low detection limit (9.8 nM), high sensitivity, and rapid response time (within 1 min). At the same time, the recovery of actual samples was 90.2–107.0%, and the relative standard deviation (RSD) was ≤ 3.82%. Simultaneously, by combining the smartphone color recognition APP with RGB analysis, a portable smartphone auxiliary sensing platform was established to realize the visual detection of MG. This method provides a novel strategy for real-time monitoring of pollutants in the environment.

Graphical Abstract