Sorption-based atmospheric water harvesting (SAWH) is a promising strategy for addressing freshwater scarcity in arid regions that extracts water vapor from the atmosphere and utilizes solar energy to drive desorption. Hygroscopic salts are commonly used to develop composite sorbents for SAWH with a high water uptake, but these salts often exhibit slow kinetics and high energy consumption for the desorption process. Herein, a natural composite hygroscopic hydrogel (NCHH) developed for sustainable and rapid SAWH, which achieved a 0.94 and 4.11 g/g high water uptake at humidity of 30% RH and 80% RH with fast sorption kinetics of ∼0.47 and ∼0.41 g∙g∙h, respectively, and outperformed most state-of-the-art hygroscopic hydrogels. To demonstrate its practical application, optimized NCHH was used to construct a prototype device for solar-driven SAWH, which demonstrated remarkable water production of about 1.33 L∙kg∙day at a low humidity of 30% RH in an outdoor environment. Our study provides a prospective pathway for the synthesis of green and efficient composite sorbents to facilitate solar-driven all-weather SAWH.

中文翻译：

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天然纳米复合材料的绿色合成，具有协同可调的吸附/解吸作用，用于太阳能驱动的全天候水分收集

基于吸附的大气水收集（SAWH）是解决干旱地区淡水短缺的一种有前景的策略，它从大气中提取水蒸气并利用太阳能来驱动解吸。吸湿盐通常用于开发具有高吸水率的 SAWH 复合吸附剂，但这些盐通常在解吸过程中表现出缓慢的动力学和高能耗。在此，开发了一种用于可持续和快速 SAWH 的天然复合吸湿水凝胶（NCHH），在 30% RH 和 80% RH 的湿度下实现了 0.94 和 4.11 g/g 的高吸水率，以及~0.47 和~0.41 g 的快速吸附动力学∙g∙h，并且优于大多数最先进的吸湿水凝胶。为了展示其实际应用，优化的 NCHH 用于构建太阳能驱动 SAWH 的原型装置，该装置在室外环境中 30% RH 的低湿度下表现出约 1.33 L∙kg∙day 的显着产水量。我们的研究为合成绿色高效复合吸附剂以促进太阳能驱动的全天候SAWH提供了一条前瞻性途径。