Breakthrough in Sustainable Water Purification: All-Cellulose Solar Evaporators

Scientists at Chungnam National University in South Korea have made a significant discovery in the field of sustainable water purification, developing an all-cellulose interfacial solar evaporator system that demonstrates outstanding performance with solar-to-vapor energy conversion efficiencies up to 95% and evaporation rates of 15 kg·m·h under high-intensity simulated sunlight. This innovative technology, which involves mercerization, a relatively mild chemical treatment, has improved wet mechanical integrity and structural stability, enabling its practical application in sustainable water treatment solutions. The research highlights the potential of all-cellulose, biodegradable solar evaporators for scalable, eco-friendly water treatment solutions.

Key Takeaways:

• The all-cellulose interfacial solar evaporator system has improved wet mechanical integrity and structural stability through mercerization, a relatively mild chemical treatment.
• The system demonstrates outstanding performance, with solar-to-vapor energy conversion efficiencies up to 95% and evaporation rates of 15 kg·m·h under high-intensity simulated sunlight.
• The research has been peer-reviewed and published in Carbohydrate Polymers.
• The technology has the potential to provide scalable, eco-friendly water treatment solutions for sustainable water purification.
• The devices consist of a porous microfibrillated cellulose supporting layer and a cellulose nanofibril photothermal layer integrated with carbon nanotubes.
• Systematic characterization revealed a robust structure and outstanding performance.
• The system demonstrates 99.9% rejection of common salts and toxic heavy-metal ions, exhibiting self-regenerating behavior.

Statistics:

• Solar-to-vapor energy conversion efficiencies up to 95%
• Evaporation rates of 15 kg·m·h under high-intensity simulated sunlight
• 99.9% rejection of common salts and toxic heavy-metal ions
• Self-regenerating behavior, highlighting the suitability for long-term field use

Sources:

• All-cellulose-based solar evaporators with improved wet mechanical integrity via mercerization. Carbohydrate Polymers, 2025;370:124470
• VerticalNews, November 3, 2025
• NewsRx LLC, November 3, 2025