Morning Glory-Inspired 3D LIG/PDA Paper Evaporators for Efficient Solar Steam Generation

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Freshwater scarcity is a critical global challenge.
• Efficient and low-cost desalination and water purification technologies are urgently needed.

Purpose of the Study:

• To develop a bioinspired, paper-based solar evaporator for efficient seawater desalination and wastewater purification.
• To investigate the impact of a 3D conical structure on evaporation performance and stability.

Main Methods:

• Fabrication of a cellulose paper substrate using laser-induced graphene (LIG) and polydopamine (PDA) modification.
• Construction of a 3D conical structure to enhance surface area and light absorption.
• Evaluation of solar evaporation rate and efficiency under simulated solar irradiation.

Main Results:

• The 3D conical solar evaporator achieved a high evaporation rate of 2.02 kg m^-2 h^-1 with 125.1% efficiency.
• The device demonstrated superior performance compared to its 2D counterpart.
• The conical geometry facilitated salt crystallization at the edges, ensuring operational stability.

Conclusions:

• The bioinspired, 3D paper-based solar evaporator offers a promising low-cost and scalable solution for sustainable freshwater generation.
• The developed technology addresses the critical need for efficient seawater desalination and wastewater purification.
• This approach showcases the potential of biomimicry in designing advanced materials for environmental applications.