Hydrogen-Bond-Repairing Solar Evaporator with Reconstructed Large-Width Channels for Durable Solarizing Seawater

Area of Science:

• Materials Science
• Environmental Engineering
• Renewable Energy

Background:

• Conventional seawater solarization methods face challenges with efficiency and space limitations.
• Interfacial solar vapor generation (ISVG) offers an energy-efficient alternative, but scalability and durability remain concerns for practical applications.
• Developing robust and adaptable solar evaporators is crucial for widespread ISVG adoption.

Purpose of the Study:

• To propose a novel hydrogen-bond-repairing solar evaporator with reconstructed large-width channels for efficient seawater solarization.
• To investigate the performance, scalability, and durability of the proposed polyacrylamide/trehalose/graphene hydrogel (PTGH) evaporator.
• To compare the efficiency and resource requirements of the PTGH evaporator against conventional solarization techniques.

Main Methods:

• Fabrication of a polyacrylamide/trehalose/graphene hydrogel (PTGH) material.
• Characterization of PTGH's mechanical properties and channel structure for salt discharge.
• Evaluation of PTGH's water evaporation rate under simulated solar irradiation (1 sun) and varying environmental conditions.
• Long-term testing of large-area PTGH for continuous seawater solarization until high brine concentration and salt separation.
• Comparative analysis of time and land usage against conventional solarization methods.

Main Results:

• The PTGH evaporator demonstrated a high water evaporation rate of 2.82 kg m^-2 h^-1 under 1 sun.
• PTGH maintained effectiveness in low-temperature environments and exhibited excellent mechanical properties.
• Large-area PTGH facilitated continuous seawater solarization, leading to concentrated brine and solid salt separation.
• The PTGH system achieved significant reductions in time or land requirements (66.67%-75%) for salt production compared to conventional methods.

Conclusions:

• The developed PTGH solar evaporator, with its unique reconstructed large-width channels and hydrogen-bond-repairing capability, offers a highly efficient and scalable solution for interfacial solar vapor generation.
• PTGH's robust performance across different conditions and its reduced resource demand highlight its potential for practical, large-scale seawater desalination and salt production.
• This innovation addresses key limitations of traditional solarization, paving the way for more sustainable and cost-effective water resource management.