4.6 Article

Hydrophobic MOFs for the efficient capture of highly polar volatile organic compound

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JOURNAL OF MATERIALS CHEMISTRY A
卷 11, 期 8, 页码 4238-4247

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta09252b

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Effective capture of polar volatile organic compounds under environmental conditions is a challenge that can be overcome by introducing perfluorinated groups into a flexible microporous MOF. The perfluorinated flexible MIL-53(Al) with one CF3 group exhibits outstanding affinity for acetic acid even in the presence of water, making it an optimum sorbent for indoor air quality management under real working conditions.
Effective capture of polar volatile organic compounds under environmental conditions is a challenge owing to the adsorption competition between polar volatile organic compounds and water. The best adsorbents usually exhibit a compromise between a moderate affinity towards the VOC and hydrophobicity. Herein, by conducting experimental (sorption isotherms, dynamic measurements, X-ray diffraction, and solid-state NMR) and computational (Monte Carlo and density functional theory) studies, we demonstrate that introducing perfluorinated groups within the flexible microporous MOF increases hydrophobicity and its MIL-53(Al) MOF increases hydrophobilicty and leads to higher affinity to VOCs. Remarkably, MIL-53(Al)-CF3 exhibits an outstanding affinity for acetic acid even in the presence of water, while its MIL-53(Al)-2CF(3) analogue, owing to steric hindrance, is not efficient. Therefore, perfluorinated flexible MIL-53(Al) with one CF3 group appears as an optimum sorbent for indoor air quality management under real working conditions, especially for high-end applications that require the removal of trace levels of VOCs under environmental conditions.

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