Flower-inspired bionic sodium alginate hydrogel evaporator enhancing solar desalination performance

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Solar desalination is crucial for sustainable freshwater production.
• Improving solar evaporator performance is key to wider application.
• Salt crystallization hinders efficient and continuous desalination.

Purpose of the Study:

• To develop a novel bionic solar evaporator for enhanced desalination.
• To investigate the effect of a 3D flower-like structure on evaporation performance.
• To suppress salt crystallization during the solar desalination process.

Main Methods:

• Fabrication of a flower-inspired bionic evaporator using black hollow sodium alginate hydrogel tubes.
• Vertical fixation of bundled hydrogel tubes to create a 3D flower structure.
• Testing the evaporator's performance under solar irradiation for evaporation rate and salt crystallization suppression.

Main Results:

• The bionic evaporator achieved an excellent evaporation rate of 3.2 kg m⁻² h⁻¹.
• Effective suppression of salt crystallization was observed.
• The 3D flower configuration increased effective evaporation area and accelerated water evaporation.

Conclusions:

• A 3D-shaped evaporator design is an effective strategy to improve solar desalination performance.
• The hollow hydrogel network ensures stable water supply and promotes ion exchange, inhibiting salt crystallization.
• This bionic approach offers a promising direction for sustainable solar desalination technology.