A self-floating electrospun nanofiber mat for continuously high-efficiency solar desalination

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Freshwater scarcity is a global challenge, driving the need for sustainable desalination solutions.
• Existing solar desalination systems struggle with continuous high efficiency and salt rejection.
• Developing robust, cost-effective desalination technologies is crucial for water security.

Purpose of the Study:

• To fabricate an electrospun nanofiber mat for continuous, high-efficiency solar desalination.
• To investigate the material's properties for effective salt rejection and water transport.
• To evaluate the performance and durability of the solar desalination system under realistic conditions.

Main Methods:

• Fabrication of an electrospun nanofiber mat using carbon nanotubes (photothermal), polyvinylidene fluoride (support), and polyvinylpyrrolidone (pore-forming agent).
• Characterization of the mat's porous structure, superhydrophilic surface, and photothermal properties.
• Performance testing of the solar desalination system under simulated seawater (20 wt% NaCl) with one sun irradiation.

Main Results:

• The nanofiber mat exhibited a porous structure and superhydrophilic surface, facilitating efficient water transport and preventing salt deposition.
• The system demonstrated strong broadband absorption, excellent photothermal performance, floatability, durability, and stability.
• Achieved an evaporation rate of 1.372 kg m⁻² h⁻¹ and a solar conversion efficiency of 86.1%, sustained for 11 hours with minimal fluctuation.

Conclusions:

• The developed electrospun nanofiber mat enables continuous, high-efficiency solar desalination, even with high-salinity brine.
• This material design offers a promising pathway for practical and sustainable freshwater generation.
• The system's performance highlights its potential for addressing global water resource challenges.