Black silver-coated cellulose paper for efficient and durable solar-driven desalination

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Solar desalination is a promising water purification method but faces challenges like bacterial contamination and reduced light absorption.
• Developing efficient and durable materials is crucial for advancing solar desalination technology.

Purpose of the Study:

• To create a cellulose-based composite material with enhanced photothermal and antibacterial properties for solar desalination.
• To investigate the controllable synthesis of silver nanoparticle deposition on cellulose paper.

Main Methods:

• Electroless silver plating was used to deposit black silver nanoparticles onto cellulose paper.
• Parameters such as reducing agent concentration, ammonia level, temperature, and time were optimized.
• Characterization included surface morphology, hydrophilicity, light absorption, and thermal management assessments.

Main Results:

• The cellulose/black silver composite paper achieved a freshwater production rate of 2.16 kg·m⁻²·h⁻¹ with 92.1% photothermal conversion efficiency under 1 sun.
• The material exhibited excellent antibacterial efficiency (100%) and good UV aging resistance.
• Silver ion release from nanoparticles effectively inhibited bacterial growth.

Conclusions:

• The developed cellulose/black silver composite paper offers a highly efficient and stable solution for solar desalination.
• The material effectively addresses bacterial contamination and enhances light absorption, improving freshwater production.
• The composite paper shows significant potential for practical applications in water purification.