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Hygroscopic-Microgels-Enabled Rapid Water Extraction from Arid Air
Weixin Guan1, Chuxin Lei1, Youhong Guo1
1Materials Science and Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 14, 2022
Summary
New hygroscopic microgels (HMGs) efficiently harvest atmospheric water, even in arid conditions. These materials offer rapid water uptake and release, providing a sustainable solution for decentralized water production.
Area of Science:
- Materials Science
- Environmental Science
- Chemical Engineering
Background:
- Atmospheric water harvesting (AWH) is crucial for addressing freshwater scarcity in arid regions.
- Hydrogels show promise for AWH due to high water retention, but require improved sorption-desorption kinetics at low relative humidity (RH).
Purpose of the Study:
- To develop and characterize novel hygroscopic microgels (HMGs) for efficient atmospheric water harvesting.
- To enhance the kinetics of water sorption and desorption for practical AWH applications in arid climates.
Main Methods:
- Synthesis of hygroscopic microgels (HMGs) using hydroxypropyl cellulose (HPC) and hygroscopic salts.
- Evaluation of water uptake capacity at low RH (15-30%).
- Assessment of sorption-desorption kinetics and daily water collection potential through material-level experiments.
Main Results:
- HMGs demonstrated significant water uptake (0.5-0.8 g g⁻¹ at 15-30% RH).
- Rapid sorption-desorption kinetics were achieved due to micro-diffusion and thermoresponsive HPC.
- Potential daily water collection of 7.9-19.1 L kg⁻¹ was projected, with 24-36 cycles per day.
Conclusions:
- HMGs offer a sustainable and efficient method for rapid moisture extraction in arid climates.
- The use of renewable raw materials and superior performance make HMGs a viable decentralized water production technology.
