Populus-Inspired Aerogel Evaporator Based on Vertically Oriented Porous Structure for Efficient Solar Steam...

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Global water scarcity necessitates sustainable and cost-effective desalination and purification methods.
• Solar steam generation is a promising technology for addressing water shortages.
• Existing solar evaporators often face challenges with efficiency, cost, and material stability.

Purpose of the Study:

• To fabricate a novel aerogel evaporator for efficient solar steam generation.
• To enhance solar absorption and reduce material costs using carbonized straw.
• To improve water transport efficiency for rapid evaporation.

Main Methods:

• Fabrication of a poly(vinyl alcohol) (PVA) and carbonized straw aerogel evaporator via directional freezing.
• Characterization of solar absorption properties.
• Evaluation of water evaporation rate and solar energy conversion efficiency under 1-sun illumination.
• Assessment of cycle stability and practical applicability.

Main Results:

• The aerogel evaporator achieved a solar absorption of 95.1%.
• Incorporating carbonized straw reduced material costs.
• Vertically aligned channels facilitated rapid water delivery, reducing transport resistance.
• Achieved a water evaporation rate of 2.6 kg m⁻² h⁻¹ and 98.2% solar energy conversion efficiency.
• Demonstrated excellent cycle stability and practical applicability.

Conclusions:

• The developed aerogel evaporator is highly efficient, eco-friendly, and cost-effective.
• The novel fabrication strategy shows significant potential for real-world seawater desalination and wastewater treatment.
• This research offers a promising solution for mitigating global water scarcity through advanced solar steam generation.