An Atmospheric Water-Harvester with Ultrahigh Uptake-Release Efficiency at Low Humidity
writer：Qiang Luo, Minshuo Chen, Dongdong Yu， 等
keywords：MOF-303, thiolated chitosan, water harvesting, high efficiency, water uptake-release
source：期刊
Issue time：2024年
ACS Nano 2024, 18, 14650?14660， https://doi.org/10.1021/acsnano.4c02866
Abstract：
Atmospheric water harvesting is a practical strategy that is achieved by removing materials from air moisture to relieve global water scarcity. Here we design a water-harvester (i.e., MOF-303/thiolated polymer composite (MTC)) by using a metal?organic framework (MOF-303) and
thiolated chitosan (TC) skeleton. Intermolecular hydrogen bonding between TC and MOF-303 facilitates porous structures with enlarged air?polymer interfaces for long cycling life and
high capacity at low relative humidity. Benefiting from synergetic effects on porosity and anchorage for accelerating the uptake-release of moisture, MTC exhibits a rapid water
uptake capacity of 0.135 g/g in 60 min under 12.5 RH% and ultrafast water desorption kinetics of 0.003 g/g/min at 8.5 RH %, which is superior to the as-reported MOF-303 based adsorbents. At low heat (～40 °C), the water desorption and collection rate, respectively, are 0.0195 and 0.0168 g/g/min within 210 min, showing ultrahigh harvesting efficiency. These results highlight the enormous potential as promising materials for solving the world’s water scarcity crisis. This study offers an insight into the design of AWH materials, which can be extended into applications in some realms, e.g., freshwater development for industry in arid areas, water engineering-related devices and systems, etc.