Efficient Solar‐Driven Water Harvesting from Arid Air with Metal–Organic Frameworks Modified by Hygroscopic Salt. (4th February 2020)

• Record Type: Journal Article
• Authors: Xu, Jiaxing; Li, Tingxian; Chao, Jingwei; Wu, Si; Yan, Taisen; Li, Wenchen; Cao, Biye; Wang, Ruzhu
• Is Part Of: Angewandte Chemie. Volume 132:Number 13(2020)
• Page Start: 5240
• Page End: 5248
• Publication Date: 2020-02-04
• Subjects: Atmosphärische Wassergewinnung -- Mesoporöse Materialien -- Metall-organische Gerüste -- Mehrstufige Sorption -- Sorptionsmittel; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201915170
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Freshwater scarcity is a global challenge threatening human survival, especially for people living in arid regions. 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 in arid climates owing to the low water sorption capacity of common sorbents under low humidity conditions. We report a high‐performance composite sorbent for efficient water harvesting from arid air by confining hygroscopic salt in a metal–organic framework matrix (LiCl@MIL‐101(Cr)). The composite sorbent shows 0.77 g g −1 water sorption capacity at 1.2 kPa vapor pressure (30 % relative humidity at 30 °C) by integrating the multi‐step sorption processes of salt chemisorption, deliquescence, and solution absorption. A highly efficient AWH prototype is demonstrated with LiCl@MIL‐101(Cr) that can enable the harvesting of 0.45–0.7 kg water per kilogram of material under laboratory and outdoor ambient conditions powered by natural sunlight without optical concentration and additional energy input. Abstract : Ein Komposit‐Sorptionsmittel für die effiziente Wassergewinnung aus trockener Luft wird durch Einschluss eines hygroskopischen Salzes in ein Metall‐organisches Gerüst (LiCl@MIL‐101(Cr)) hergestellt. Das Material funktioniert effizient unter Umgebungsbedingungen im Freien und wird durch natürliches Sonnenlicht ohne zusätzlichen Energieaufwand betrieben.