Affiliation:
1. Materials Science and Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712
Abstract
Water scarcity is a pressing global issue, requiring innovative solutions such as atmospheric water harvesting (AWH), which captures moisture from the air to provide potable water to many water-stressed areas. Thermoresponsive hydrogels, a class of temperature-sensitive polymers, demonstrate potential for AWH as matrices for hygroscopic components like salts predominantly due to their relatively energy-efficient desorption properties compared to other sorbents. However, challenges such as limited swelling capacity due to the salting-out effect and difficulty in more complete water release hinder the effectiveness of conventional hydrogel sorbents. To overcome these limitations, we introduce molecularly confined hydration in thermoresponsive hydrogels by employing a bifunctional polymeric network composed of hygroscopic zwitterionic moieties and thermoresponsive moieties. Here, we show that this approach ensures stable water uptake, enables water release at relatively low temperatures, and exhibits rapid sorption–desorption kinetics. Furthermore, by incorporating photothermal absorbers, the sorbent can achieve solar-driven AWH with comparable water release performance. This work advances the design of AWH sorbents by introducing molecularly confined hydration in thermoresponsive hydrogels, leading to a more efficient and sustainable approach to water harvesting. Our findings offer a potential solution for advanced sorbent design with comprehensive performance to mitigate the freshwater crisis.
Funder
Welch Foundation
Camille and Henry Dreyfus Foundation
Publisher
Proceedings of the National Academy of Sciences
Reference52 articles.
1. World Health Organization & United Nations Children's Fund (UNICEF) Progress on drinking water Sanitation and hygiene: 2017 update and SDG baselines (World Health Organization and the United Nations Children's Fund 2017).
2. Four billion people facing severe water scarcity
3. Global potential for harvesting drinking water from air using solar energy
4. Global Hydrological Cycles and World Water Resources
5. Practical water production from desert air
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