环境科学
相对湿度
纤维素
材料科学
气象学
化学工程
工程类
物理
作者
Wenkai Zhu,Yun Zhang,Chi Zhang,Xiwei Shan,Akshay K. Rao,Sarah Pitts,Travest J. Woodbury,Tanya Sophia Masnyk,Dominique Derome,David M. Warsinger,Xiulin Ruan,Lisa J. Mauer,Jan Carmeliet,Tian Li
标识
DOI:10.1038/s44172-023-00082-3
摘要
Abstract Emerging atmospheric water harvesting (AWH) technologies hold promise for water supply to underdeveloped regions with limited access to liquid water resources. The prevailing AWH systems, including condensation- or sorption-based, mostly rely on a single mechanism limited by working conditions and inferior performance. Here, we synergistically integrate multiple mechanisms, including thermosorption effect, radiative cooling, and multiscale cellulose-water interactions to improve the water harvesting performance with minimal active energy input over a relative humidity (RH) range between 8% to 100%. The proposed system consists of a scalable and sustainable cellulose scaffold impregnated with hygroscopic lithium chloride (LiCl). Cellulose scaffold and LiCl synergistically interact with water at molecular, nanometer, and micrometer scales, achieving a high yield (2.5–16 kg kg −1 at 60–90% RH). The captured water in return facilitates radiative cooling due to its intrinsically high infrared emissivity. An outdoor batch-mode AWH device shows a water uptake up to 6.75 L kg −1 day −1 with a material cost as low as 3.15–5.86 USD kg −1 . A theoretical model is also proposed to elucidate the synergistic AWH mechanisms among cellulose-LiCl-water-energy interaction. This AWH strategy provides a potential solution to water scarcity problems in regions with larger seasonal and climate variations, especially arid areas.
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