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⁻¹ h⁻¹ at 30% relative humidity and a desorption rate of 1.98 kg kg⁻¹ h⁻¹, 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_gel⁻¹ (18.87 g kg_device⁻¹). This portable harvester highlights the potential for fast and scalable atmospheric water harvesting in extreme environments.

中文翻译：

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基于具有快速吸附/解吸动力学的生物基凝胶的太阳能驱动滚筒式大气集水器


基于吸附的大气水收集是开发非常规水源的一项有吸引力的技术。一个关键的挑战是如何促进快速、连续地从空气中收集饮用水。在这里，报道了一种生物基凝胶（纤维素/藻酸盐/木质素凝胶，CAL 凝胶），它是由整个生物质衍生的聚合物网络与氯化锂整合而成。快速的吸附/解吸动力学，在30%相对湿度下，水捕获率为1.74 kg·kg ⁻¹ ·h ⁻¹ ，解吸率为1.98 kg·kg ⁻¹ h ⁻¹ ，由于其强吸湿性、亲水网络、丰富的水传输通道、光热转换能力以及约 200 µm 厚的自支撑大结构，在一块 CAL 凝胶中同时实现多组分协同作用所致。设计了一种太阳能驱动、滚筒式、可调谐、便携式收集器，可以在短时间内收集大气中的水。在室外条件下，配备 CAL 凝胶的收割机每天运行 36 个开关（180°），实现产水量 8.96 kg kg _gel ⁻¹ （18.87 g kg _device ⁻¹ ）。这款便携式收割机凸显了在极端环境下快速且可扩展的大气水收割的潜力。