Synthesis and water adsorption properties of MIL-96(Al)and its composite adsorbents
The aluminum-based metal-organic framework material MIL-96(Al)was prepared by solvother-mal synthesis,and the composite adsorbent MIL-96(Al)-L was prepared by impregnation for the first time.The morphology of the prepared adsorbents was showed by scanning electron microscopy(SEM).In the adsorption experiments under different working conditions,MIL-96(Al)had a stable equilibrium adsorption capacity,and the addition of hygroscopic salt LiCl enhanced the water absorption properties of the composite adsorbents.In terms of adsorption rate,MIL-96(Al)and its composite adsorbents showed excellent performance.The adsorption rate of MIL-96(Al)was relatively stable at different temperature and humidity conditions,up to 0.172 g/(g·h),while the adsorption rate of MIL-96(Al)-L3 was up to 3.7 times that of MIL-96(Al)at the same conditions.MIL-96(Al)and its composite adsorbents could be desorbed within 30 min at 110 ℃.Its hydrothermal stability was also confirmed by cyclic regeneration experiments.The results indicate that MIL-96(Al)-L composite adsorbent is a kind of adsorbent which may be applied in atmospheric water harvesting for arid areas.
metal-organic frameworkssolar-driven atmospheric water harvestingcomposite adsorbentopen adsorption performance
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