Enhanced Solar Evaporation Using a Scalable MoS₂ -Based Hydrogel for Highly Efficient Solar Desalination

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Interfacial photo-vapor conversion is a promising sustainable technology for seawater desalination.
• Existing methods face challenges with salt accumulation and poor mechanical stability, limiting performance.

Purpose of the Study:

• To develop a scalable and mechanically stable material for efficient seawater desalination using interfacial photo-vapor conversion.
• To address limitations of salt accumulation and poor durability in current desalination technologies.

Main Methods:

• Fabrication of a molybdenum disulfide (MoS2)-based porous hydrogel (SMoS2-PH) via crosslinking foaming polymerization.
• Characterization of the hydrogel's porosity, mechanical stability, and salt resistance.
• Evaluation of photothermal conversion efficiency and evaporation rate under simulated solar illumination.

Main Results:

• The SMoS2-PH exhibited high porosity (92.63%) and excellent mechanical stability.
• Achieved an impressive evaporation rate of 3.297 kg m⁻² h⁻¹ and photothermal conversion efficiency of 93.4% under 1-sun illumination.
• Demonstrated stable photothermal properties for 15 days on seawater surface, indicating superior salt resistance.

Conclusions:

• The SMoS2-PH presents a promising, scalable, and cost-effective solution for full-scale seawater desalination.
• Its high efficiency, durability, and salt resistance overcome key limitations of current technologies.
• The readily available MoS2 and straightforward preparation method enhance its potential for practical application.