Welding Pollen-Based Solar Evaporator for Clean Water Production

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Global water scarcity is exacerbated by agricultural irrigation's high freshwater consumption.
• Plant water transport mechanisms offer inspiration for novel water purification technologies.

Purpose of the Study:

• To develop a cost-effective and sustainable solar evaporator for seawater desalination.
• To utilize natural pollen as a primary material for efficient water purification.

Main Methods:

• Fabrication of a pollen-based solar evaporator (PSE) using welding pollen.
• Characterization of PSE's evaporation rate, cycling stability, and mechanical properties.
• Testing the usability of collected freshwater for crop cultivation (lettuce, rice, wheat).

Main Results:

• The PSE achieved an efficient evaporation rate of 1.86 kg m^-2 h^-1 under one-sun illumination.
• Demonstrated excellent 10-cycle performance in 7.0 wt.% saline water without salt accumulation.
• Showcased superior mechanical stability (3.44 MPa) and chemical resistance across a wide pH range.

Conclusions:

• Pollen is a viable, low-cost, and eco-friendly material for interfacial solar evaporation.
• The developed PSE technology offers a practical solution for freshwater generation.
• This approach supports sustainable agriculture and addresses global water challenges.