Highly Elastic Interconnected Porous Hydrogels through Self-Assembled Templating for Solar Water Purification

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Solar-driven interfacial evaporation using hydrogels offers a sustainable path to clean water.
• Scalability and mechanical durability of hydrogel evaporators remain significant challenges for practical application.

Purpose of the Study:

• To develop a scalable and robust method for fabricating elastic hydrogel solar evaporators.
• To enhance the performance and durability of hydrogel-based desalination systems.

Main Methods:

• Fabrication of large-scale elastic hydrogel evaporators using a self-assembled templating (SAT) strategy.
• Characterization of the hydrogel's porous structure, mechanical properties, and water transport rate.
• Evaluation of solar evaporation performance, including evaporation rate and solar-to-vapor efficiency.

Main Results:

• The SAT method produced hydrogels with a highly interconnected porous structure, low tortuosity, and tunable pore size.
• The fabricated hydrogel evaporators exhibited superior elasticity with rapid shape recovery after repeated mechanical stress.
• Achieved a high evaporation rate of approximately 2.8 kg m⁻² h⁻¹ and a solar-to-vapor efficiency of around 90%.

Conclusions:

• The SAT strategy provides a scalable and efficient approach for producing durable hydrogel solar evaporators without freeze-drying.
• This method facilitates the industrialization of hydrogel evaporators for practical clean water generation.
• The developed hydrogels demonstrate significant potential for affordable and sustainable desalination.