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Efficient Solar‐driven Water Harvesting from Arid Air with Metal‐organic Frameworks Modified by Hygroscopic Salt
Angewandte Chemie International Edition ( IF 12.257 ) Pub Date : 2020-01-13 , DOI: 10.1002/anie.201915170
Jiaxing Xu; Tingxian Li; Jingwei Chao; Si Wu; Taisen Yan; Wenchen Li; Biye Cao; Ruzhu Wang

Freshwater scarcity is a global challenge threatening human survival, especially for people living in arid regions. The sorption‐based atmospheric water harvesting (AWH) is an appealing way to solve this problem. However, the state‐of‐the‐art AWH technologies have poor water harvesting performance at arid climates due to the low water sorption capacity of common sorbents under low humidity conditions. Here, we report a high‐performance composite sorbent for efficient water harvesting from arid air by confining hygroscopic salt in metal‐organic framework matrix (LiCl@MIL‐101(Cr)). The composite sorbent shows 0.77 g/g water sorption capacity at 1.2 kPa vapor pressure (30% RH at 30 °C) by integrating the multi‐step sorption processes of salt chemisorption, deliquescence, and solution absorption. We demonstrate a high‐efficient AWH prototype with LiCl@MIL‐101(Cr) enabling harvesting 0.45‐0.7 kg water per kg material under laboratory and outdoor ambient conditions powered by natural sunlight without optical concentration and additional energy input.
更新日期:2020-01-14

 

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