Macroporous Hydrogel for High-Performance Atmospheric Water Harvesting

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Global water scarcity necessitates innovative water harvesting solutions.
• Existing atmospheric water harvesting (AWH) technologies face challenges in cost and performance.
• Developing simple, low-cost, high-performance AWH materials is crucial.

Purpose of the Study:

• To develop a simple and low-cost macroporous hydrogel for high-performance atmospheric water harvesting.
• To investigate the water sorption and desorption properties of the fabricated hydrogel.
• To assess the potential of the hydrogel for practical water generation.

Main Methods:

• Fabrication of a macroporous hydrogel using pore foaming and vacuum drying.
• Characterization of the hydrogel's structure, surface area, and water sorption capacity.
• Evaluation of water desorption kinetics under photothermal conditions and assessment of daily water yield.

Main Results:

• The macroporous hydrogel exhibits high water sorption capacity (up to 433.72% of its weight) across a wide humidity range (20%-100% RH).
• Achieved rapid vapor capture (0.32 g g⁻¹ h⁻¹) and efficient water release (99.38%) via photothermal effect at low desorption temperatures (~50 °C).
• Estimated daily water yield of 2.56 kg kg⁻¹ day⁻¹, sufficient for daily minimum adult consumption.

Conclusions:

• The developed macroporous hydrogel offers a simple, affordable, and scalable solution for high-performance atmospheric water harvesting.
• This material shows significant potential for addressing water scarcity and has applications in various fields.
• The hydrogel's properties enable efficient water generation even under challenging environmental conditions.