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.

中文翻译：

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低湿度下具有超高吸收释放效率的常压集水器

大气集水是一种实用策略，通过去除空气中的水分来缓解全球水资源短缺。在这里，我们利用金属有机框架（MOF-303）和硫醇化壳聚糖（TC）骨架设计了一种水收集器（即MOF-303/硫醇化聚合物复合材料（MTC））。 TC 和 MOF-303 之间的分子间氢键有助于形成具有扩大的空气-聚合物界面的多孔结构，从而在低相对湿度下实现长循环寿命和高容量。受益于孔隙率和锚固的协同效应，加速水分的吸收和释放，MTC在12.5 RH%下表现出60分钟内0.135 g/g的快速吸水能力和在8.5 RH%下0.003 g/g/min的超快水解吸动力学。 RH%，优于报道的基于 MOF-303 的吸附剂。在低热（~40℃）下，210分钟内水解吸率和收集率分别为0.0195和0.0168g/g/min，显示出超高的收集效率。这些结果凸显了作为解决世界水资源短缺危机的有前景材料的巨大潜力。这项研究提供了对AWH材料设计的深入了解，它可以扩展到一些领域的应用，例如干旱地区工业淡水开发、水工程相关设备和系统等。