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<p>A&#xa0;novel MOF-on-MOF heterostructure (MIL-125@ZIF-8) was synthesized&#xa0;and utilized as a coating material for solid-phase microextraction (SPME), which was subsequently coupled with gas chromatography (GC) for the sensitive determination of organophosphate esters (OPEs) in water samples. Compared to commercial fiber, the MIL-125@ZIF-8 coated fiber (MIL-125@ZIF-8-F) demonstrated superior extraction performance for medium-polar or non-polar compounds due to multiple interactions such as hydrophobic interaction, π-π stacking, and hydrogen bonding. The synergistic effect of MIL-125 and ZIF-8 endowed the MIL-125@ZIF-8-F with high efficiency and excellent stability under extreme conditions. Specifically, the developed MIL-125@ZIF-8-F could withstand 80 conditioning cycles without significant loss of extraction capacity. Moreover, the established method exhibited a wide linear range (10–1000 μg L<sup>−1</sup>), low detection limits (0.03–0.20 μg L<sup>−1</sup>), and excellent reproducibility under optimized condition. Finally, this proposed method provided a promising approach for the efficient enrichment of trace OPEs in actual environmental water samples.</p> Graphical Abstract <p></p>

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MIL-125@ZIF-8 based solid phase microextraction coating for sensitive determination of organophosphate esters in aqueous environments

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Xingru Hu,
  • Jiahui Hou,
  • Long Pang,
  • Zhigao Feng,
  • Junhao Liu,
  • Haiyang Feng,
  • Ying Kong,
  • Chao Liu

摘要

A novel MOF-on-MOF heterostructure (MIL-125@ZIF-8) was synthesized and utilized as a coating material for solid-phase microextraction (SPME), which was subsequently coupled with gas chromatography (GC) for the sensitive determination of organophosphate esters (OPEs) in water samples. Compared to commercial fiber, the MIL-125@ZIF-8 coated fiber (MIL-125@ZIF-8-F) demonstrated superior extraction performance for medium-polar or non-polar compounds due to multiple interactions such as hydrophobic interaction, π-π stacking, and hydrogen bonding. The synergistic effect of MIL-125 and ZIF-8 endowed the MIL-125@ZIF-8-F with high efficiency and excellent stability under extreme conditions. Specifically, the developed MIL-125@ZIF-8-F could withstand 80 conditioning cycles without significant loss of extraction capacity. Moreover, the established method exhibited a wide linear range (10–1000 μg L−1), low detection limits (0.03–0.20 μg L−1), and excellent reproducibility under optimized condition. Finally, this proposed method provided a promising approach for the efficient enrichment of trace OPEs in actual environmental water samples.

Graphical Abstract