Enhanced Contactless Salt-Collecting Solar Desalination

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Global water scarcity necessitates sustainable desalination solutions.
• Salt accumulation remains a major challenge for conventional solar desalination systems, limiting their long-term stability and efficiency.

Purpose of the Study:

• To develop a stable and highly efficient solar desalination system that addresses salt accumulation.
• To demonstrate a paper-based thermal radiation-enabled evaporation system (TREES) for sustainable salt-collecting desalination.

Main Methods:

• A novel paper-based thermal radiation-enabled evaporation system (TREES) was designed and fabricated.
• The system utilizes a dynamic evaporation front and water as its own absorber via energy down-conversion.
• Performance was evaluated using 7 wt % brine under 1 sun illumination for extended periods.

Main Results:

• The TREES achieved a continuous water evaporation rate of 2.25 L m⁻² h⁻¹ under 1 sun illumination.
• The system demonstrated stable operation for over 366 hours, exceeding the input solar energy limit.
• Enhanced evaporation was attributed to the unique vertical evaporation wall capturing thermal energy efficiently.

Conclusions:

• The paper-based TREES offers a sustainable and highly efficient approach to salt-collecting desalination.
• The findings provide new insights for designing advanced solar evaporators for green desalination applications.
• This technology represents a significant step towards addressing global water shortages through innovative desalination methods.