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<p>Metal-organic frameworks (MOFs) represent a sophisticated class of crystalline materials characterized by metal ions coordinated with organic ligands, resulting in highly porous structures. Among them, MOF-801, a zirconium-based framework, stands out due to its exceptional surface area and customizable pore architecture. In this study, MOF-801 was synthesized by a solvothermal method, and an impregnation technique was utilized to composite it with the hygroscopic salt LiCl. This process yielded three composite adsorbents (ML-1, ML-2, ML-3) with varying LiCl mass fractions. The morphological characteristics of MOF-801 and its composite materials were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption measurements. The influence of hygroscopic salt content on the adsorption performance of the composite adsorbents was analyzed, and the desorption performance of MOF-801 and its composites was evaluated under various temperature conditions. The experiments demonstrated that composite adsorbents containing LiCl exhibited commendable adsorption performance, desorption capabilities, and cyclic stability. The composite adsorbent ML-3, featuring a 30% LiCl mass fraction, achieved an equilibrium adsorption capacity of 0.6788&#xa0;g/g after 25 adsorption-desorption cycles at 25&#xa0;°C and 50% RH, representing a 168% increase compared to pure MOF-801. Additionally, ML-3 exhibited significantly enhanced desorption rates and speeds, indicating its potential applicability in atmospheric water harvesting (AWH).</p>

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Experimental investigation on the water vapor adsorption performance of MOF-801 and its composite adsorbent

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Huizhong Z. Zhao,
  • Chunbo Miao,
  • Chengfeng Liu,
  • Qingge Wang,
  • Zhihao Xi

摘要

Metal-organic frameworks (MOFs) represent a sophisticated class of crystalline materials characterized by metal ions coordinated with organic ligands, resulting in highly porous structures. Among them, MOF-801, a zirconium-based framework, stands out due to its exceptional surface area and customizable pore architecture. In this study, MOF-801 was synthesized by a solvothermal method, and an impregnation technique was utilized to composite it with the hygroscopic salt LiCl. This process yielded three composite adsorbents (ML-1, ML-2, ML-3) with varying LiCl mass fractions. The morphological characteristics of MOF-801 and its composite materials were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption measurements. The influence of hygroscopic salt content on the adsorption performance of the composite adsorbents was analyzed, and the desorption performance of MOF-801 and its composites was evaluated under various temperature conditions. The experiments demonstrated that composite adsorbents containing LiCl exhibited commendable adsorption performance, desorption capabilities, and cyclic stability. The composite adsorbent ML-3, featuring a 30% LiCl mass fraction, achieved an equilibrium adsorption capacity of 0.6788 g/g after 25 adsorption-desorption cycles at 25 °C and 50% RH, representing a 168% increase compared to pure MOF-801. Additionally, ML-3 exhibited significantly enhanced desorption rates and speeds, indicating its potential applicability in atmospheric water harvesting (AWH).