Polyzwitterionic Hydrogels for Highly Efficient High Salinity Solar Desalination

Interfacial solar vapor generation (SVG) is regarded as a promising and sustainable strategy for clean water production. While many materials have demonstrated excellent evaporation rates under one sun, it remains challenging to design solar evaporators without compromising SVG performance in high-salinity brines (>= 10 wt %). Herein, polyzwitterionic hydrogels (PZHs) are proposed as a novel platform for high-salinity solar desalination. Taking advantage of the unique anti-polyelectrolyte effects, PZHs can trap salt ions from the brine water to form a more hydrated polymer network, leading to enhanced SVG performance. PZHs exhibit an exceptional solar evaporation rate of 4.14 kg m(-2) h(-1) in 10 wt % brine, which is approximate to 20 % higher than that in pure water. It is anticipated that salt-responsive PZHs may provide insights for the design of next-generation solar desalination systems.

Automated summary

Polyzwitterionic hydrogels (PZHs) are proposed as a novel platform for high-salinity solar desalination, utilizing the anti-polyelectrolyte effects to improve solar vapor generation performance. PZHs exhibit a solar evaporation rate approximately 20% higher in high-salinity brines compared to pure water.