Ceramic-carbon Janus membrane for robust solar-thermal desalination.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Conventional distillation membranes face limitations in stability and energy efficiency for sustainable water production.
• Hypersaline water treatment requires robust and energy-efficient desalination technologies.

Purpose of the Study:

• To develop and evaluate a ceramic-carbon Janus membrane for enhanced solar-thermal desalination.
• To improve energy efficiency, stability, and water flux for hypersaline water treatment.

Main Methods:

• Fabrication of a ceramic-carbon Janus membrane with tailored surface properties.
• Solar-thermal desalination experiments using hypersaline water.
• Performance evaluation including solar-thermal efficiency, water flux, and salt rejection.
• Computational simulations to elucidate performance enhancement mechanisms.

Main Results:

• The Janus membrane achieved high solar-thermal efficiency (66.8-68.8%) and water flux (3.3-5.1 L m⁻² h⁻¹).
• Enhanced performance was attributed to increased membrane surface temperature, mitigating polarization and attenuation.
• The nano-carbon surface facilitated rapid evaporation by lowering the energy barrier.
• Stable water flux and salt rejection were observed for seawater and hypersaline water due to anti-scaling properties.

Conclusions:

• The ceramic-carbon Janus membrane demonstrates significant potential for efficient and stable solar-thermal desalination of hypersaline water.
• This design strategy offers a pathway for next-generation membranes in sustainable water purification.
• The membrane's properties enable effective treatment of challenging water sources.