Large-scale 3D printed fouling-resistant self-floating evaporator.

Area of Science:

• Materials Science
• Environmental Engineering
• Chemical Engineering

Background:

• Global freshwater scarcity necessitates innovative desalination methods.
• Existing solar interfacial desalination faces challenges in efficiency, fouling resistance, and long-term stability.
• Minimizing carbon emissions in water treatment is crucial for environmental sustainability.

Purpose of the Study:

• To develop a novel 3D-printed solar evaporator for efficient and stable interfacial desalination.
• To enhance fouling resistance and energy efficiency in solar-driven water purification.
• To create a sustainable and portable solution for freshwater generation.

Main Methods:

• Fabrication of a 3D-printed concave-shaped solar evaporator using advanced printing techniques.
• Double-sided surface modification to optimize photothermal conversion and salt rejection.
• Development of a floating freshwater collection setup for efficient vapor condensation.
• Implementation of a decoupling design for enhanced evaporation stability and easy maintenance.

Main Results:

• Achieved nearly 100% photothermal evaporation efficiency under one sun illumination.
• Demonstrated a high evaporation rate of 2.23 kg/m²/h and freshwater collection rate of 1.23 kg/m²/h.
• Exhibited superior heat transfer, ultra-effective salt resistance, and an enlarged water-air interfacial area.
• Showcased long-term evaporation stability beyond traditional limitations through a renewable water-intake layer.

Conclusions:

• The 3D-printed concave solar evaporator offers a highly efficient and stable solution for solar-driven desalination.
• The integrated evaporator-collector system demonstrates significant potential for portable and sustainable freshwater production.
• This technology addresses key challenges in interfacial desalination, paving the way for wider application.