Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 2, Pages 704-710Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta09223k
Keywords
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Funding
- National Natural Science Foundation of China [21675032, 21505023]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
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Facile preparation of self-floating photothermal membranes with simultaneous mechanical stability and antibacterial activity for solar-driven interfacial water evaporation is regarded as a practical approach for clean water production. Herein, a robust porous bi-layered photothermal membrane (carbon nanotube@polyethylene imine/mixed cellulose esters, CNT@PEI/MCE), where the top solar conversion layer of pristine CNTs is seamlessly connected to the bottom heat transfer barrier layer of hydrophilic MCE, is facilely prepared via a simple vacuum filtration. With the synergistic integration of MCE-mediated heating localization, CNT-mediated solar-heating, PEI-mediated hygroscopicity and noncovalent interactions, the CNT@PEI/MCE membrane can stay at the water-air interface with Wenzel's wetting behavior and can thus achieve a high interfacial water evaporation efficiency (72%) and a rapid evaporation rate (4.23 times higher than that of pure water) under simulated solar irradiation. Meanwhile, the CNT@PEI/MCE membrane exhibits good mechanical stability, strong operability, distinct antibacterial activity and high durability. This advanced membrane, together with its cost-effectiveness, provides a practical sustainable energy technique for clean water production.
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