作者：Qiang Luo, Tiance Zhang, Mingshuo Chen, Chang Gao, Li Guo, Maolin Zhou, Lingmei Zhu, Huijie Wei, Ass
关键字：Water harvesting
论文来源：期刊
具体来源：Small 2025, 21, 2503948
发表时间：2025年

Atmospheric water harvesting (AWH) is a promising strategy for freshwater

production to alleviate water scarcity, but it remains challenging due to its

limited daily water production volume at extremely low relative humidity

(RH). Herein, a super-hygroscopic composite (CHG) is reported that is

fabricated by using chitosan (CS), hyaluronic acid (HA), metal–organic

frameworks (MOF-303), graphene oxide (GO), and calcium chloride (CaCl2).

In this strategy, the CS-HA serves as a cation/anion substrate to form stable

hydrogel structure with CaCl2 salt. MOF-303 and GO exhibit a significantly

enhanced water harvesting capacity at low RH (≤30% RH). CaCl2 additionally

improves structural stability, firmly locking the MOF-303 and GO particles

into the entangled chain structure of the micro-gel network. The hydrophilicity

and porosity of CS-HA frameworks promote diffusion and storage of water

molecules, realizing the effective atmospheric moisture capture of the CHG.

The CHGrealizes a high-water uptake of ≈0.78 g g?1 at 20% RH, and after

absorbing water to saturation at 45% RH, it achieves ≈0.93 g g?1 in 120 min

under 0.50-sun illumination. Especially, CHG on a large scale displays a high

sorption-desorption efficiency, which achieves an excellent freshwater yield of

≈9.95 L kg?1 day?1 under ≈25% RH and temperature of ≈30 °Cviathe

self-made device. This work offers new insights into the design of

high-performance materials for AWH applications in water-lacking situations

or arid regions.

https://doi.org/10.1002/smll.202503948