Hybrid Hydrogel with High Water Vapor Harvesting Capacity for Deployable Solar-Driven Atmospheric Water Generator

被引:321
作者
Li, Renyuan [1 ]
Shi, Yusuf [1 ]
Alsaedi, Mossab [1 ]
Wu, Mengchun [1 ]
Shi, Le [1 ]
Wang, Peng [1 ]
机构
[1] King Abdullah Univ Sci & Technol, Water Desalinat & Reuse Ctr, Div Biol & Environm Sci & Engn, Thuwal 239556900, Saudi Arabia
关键词
METAL-ORGANIC FRAMEWORKS; POLYACRYLAMIDE; ADSORPTION; COLLECTION; SYSTEMS; SALTS;
D O I
10.1021/acs.est.8b02852
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Earth's atmosphere holds approximately 12 900 billion tons of fresh water distributed all over the world with fast replenishment. Atmospheric water harvesting is emerging as a promising strategy for clean water production in arid regions, land-locked areas, and remote communities. The water vapor sorbent is the key component for atmospheric water harvesting devices based on absorbing-releasing process. In this work, a flexible hybrid photothermal water sorbent composed of deliquescent salt and hydrogel was rationally fabricated. It possesses superior water sorption capacity even in low humidity air thanks to the deliquescent salt and maintains a solid form after it sorbs a large amount of water owing to the hydrogel platform. The harvested water could be easily released under regular sunlight via the photothermal effect, and it can be directly reused without noticeable capacity fading. An "easy-to-assemble-at-household" prototype device with 35 g of the dry hydrogel was tested outdoors under field conditions and delivered 20 g of fresh water within 2.5 h under natural sunlight. It is estimated that the material cost of making such a device to supply minimum daily water consumption for an adult (i.e., 3 kg) is only $3.20 (USD). This type of atmospheric water generator (AWG) is cheap and affordable, works perfectly with a broad range of humidity, does not need any electricity, and thus is especially suitable for clean water production in remote areas.
引用
收藏
页码:11367 / 11377
页数:11
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