Solar-Driven Drum-Type Atmospheric Water Harvester Based on Bio-Based Gels with Fast Adsorption/Desorption Kinetics.
basic_science · Level V
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- Record sourced from PubMed, PMID 38739951.
- Also identified by DOI 10.1002/adma.202403876.
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Abstract
Sorption-based atmospheric water harvesting is an attractive technology for exploiting unconventional water sources. A critical challenge is how to facilitate fast and continuous collection of potable water from air. Here, a bio-based gel (cellulose/alginate/lignin gel, CAL gel), resulting from the integration of a whole biomass-derived polymer network with lithium chloride is reported. A fast adsorption/desorption kinetics, with a water capture rate of 1.74 kg kg<sup>-1</sup> h<sup>-1</sup> at 30% relative humidity and a desorption rate of 1.98 kg kg<sup>-1</sup> h<sup>-1</sup>, is simultaneously realized in one piece of CAL gel, because of its strong hygroscopicity, hydrophilic network, abundant water transport channels, photothermal conversion ability, and ≈200-µm-thick self-supporting bulky structure caused by multicomponent synergy. A solar-driven, drum-type, tunable, and portable harvester is designed that can harvest atmospheric water within a brief time. Under outdoor conditions, the harvester with CAL gels operates 36 switches (180°) per day realizes a water yield of 8.96 kg kg<sub>gel</sub> <sup>-1</sup> (18.87 g kg<sub>device</sub> <sup>-1</sup>). This portable harvester highlights the potential for fast and scalable atmospheric water harvesting in extreme environments.