Moisture-indicating cellulose aerogels for multiple atmospheric water harvesting cycles driven by solar energy

被引:31
作者
Sun, Jiaming [1 ,2 ]
An, Bang [1 ,2 ]
Zhang, Kun [1 ,2 ]
Xu, Mingcong [1 ,2 ]
Wu, Zhenwei [1 ,2 ]
Ma, Chunhui [1 ,2 ]
Li, Wei [1 ,2 ]
Liu, Shouxin [1 ,2 ]
机构
[1] Minist Educ, Key Lab Biobased Mat Sci & Technol, Harbin, Peoples R China
[2] Northeast Forestry Univ, Engn Res Ctr Adv Wooden Mat, Minist Educ, Harbin 150040, Peoples R China
基金
中国国家自然科学基金;
关键词
CARBON; PERFORMANCE; DESICCANT; DEVICE;
D O I
10.1039/d1ta07498a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Despite the boom in atmospheric water harvesting (AWH) techniques used to deal with the challenge of clean water shortage, few studies focus on hygroscopic materials that can indicate a moisture change in real time. Here, a moisture-indicating hygroscopic aerogel working in a broad range of relative humidities (RHs) and with fast sorption kinetics is designed for solar driven sorption-based AWH by integrating ethanolamine-decorated CoCl2 (E-CoCl2), microfibrillated cellulose (MFC) and LiCl-decorated polypyrrole (Cl-ppy). The specimen can visually indicate the sorption process in real time while harvesting moisture, achieving a flexible response to changes in environmental humidity and solar radiation. Fabricating an open, unordered, interconnected skeleton in E-CoCl2 using MFC can effectively enhance its sorption kinetics and also prevent the leakage of liquefied salt solution. The specimen has water sorption capacities of 0.39-2.05 kg kg(-1) under RH 25-85% within 3.5 h and can quickly desorb within 1.5 h under 1 sun. An AWH device can conduct 3 sorption/desorption cycles within 9 h during one day outdoors and produces 2.81 kg(water) kg(sorbent)(-1). This strategy is a promising approach to enable sustainable water delivery without geographical and hydrological limitations, especially for the landlocked communities and arid areas.
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页码:24650 / 24660
页数:11
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