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<p>It is of urgent significance to develop highly stable and efficient CrO<sub>4</sub><sup>2−</sup> detection technology in the fields of drinking water distribution and sewage treatment. A highly stable europium metal-organic framework (Eu-MOF) was designed as fluorescent probe for the efficient detection of trace CrO<sub>4</sub><sup>2−</sup> in water solutions. This was achieved through the self-assembly of the lanthanide Eu<sup>3+</sup> and a rigid conjugated organic ligand [2,2’- biquinoline]-4,4’-dicarboxylic acid (H<sub>2</sub>L) under hydrothermal conditions. The obtained Eu-MOF exhibits excellent water stability, thermal stability and photostability. The Eu-MOF can quantitatively detect trace amounts of CrO<sub>4</sub><sup>2−</sup> through fluorescence quenching effect. Its detection sensitivity is 4.48 × 10<sup>4</sup>M<sup>− 1</sup>, with a detection limit as low as 0.06 µM (9.7&#xa0;µg/L). This is one of the lowest values for the detection limit of CrO<sub>4</sub><sup>2−</sup> in aqueous solution and is far below the allowable level for drinking water specified by World Health Organization. The Eu-MOF sensor also demonstrates excellent selectivity, anti-interference ability, repeatability (after 4 cycles), reproducibility and practical feasibility. Furthermore, the fluorescent luminescence and senseing mechanism were studied in detail. The fluorescence senseing mechanism of the Eu-MOF for CrO<sub>4</sub><sup>2−</sup> detection involves the competitive absorption of excitation energy. The fluorescence-based sensing technology using the Eu-MOF provides a reference for environmental pollution detection and holds potential practical value.</p>

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A Highly Stable Eu-MOF as an Excellent Fluorescent Probe for Efficient Detection of Trace CrO42− in Water Solutions

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Deyan Liu,
  • Manying Zhu,
  • Nanhai Zhang,
  • Qinghe Song,
  • Guangjun He,
  • Shixing Wang,
  • Libo Zhang

摘要

It is of urgent significance to develop highly stable and efficient CrO42− detection technology in the fields of drinking water distribution and sewage treatment. A highly stable europium metal-organic framework (Eu-MOF) was designed as fluorescent probe for the efficient detection of trace CrO42− in water solutions. This was achieved through the self-assembly of the lanthanide Eu3+ and a rigid conjugated organic ligand [2,2’- biquinoline]-4,4’-dicarboxylic acid (H2L) under hydrothermal conditions. The obtained Eu-MOF exhibits excellent water stability, thermal stability and photostability. The Eu-MOF can quantitatively detect trace amounts of CrO42− through fluorescence quenching effect. Its detection sensitivity is 4.48 × 104M− 1, with a detection limit as low as 0.06 µM (9.7 µg/L). This is one of the lowest values for the detection limit of CrO42− in aqueous solution and is far below the allowable level for drinking water specified by World Health Organization. The Eu-MOF sensor also demonstrates excellent selectivity, anti-interference ability, repeatability (after 4 cycles), reproducibility and practical feasibility. Furthermore, the fluorescent luminescence and senseing mechanism were studied in detail. The fluorescence senseing mechanism of the Eu-MOF for CrO42− detection involves the competitive absorption of excitation energy. The fluorescence-based sensing technology using the Eu-MOF provides a reference for environmental pollution detection and holds potential practical value.