Highly efficient solar steam evaporation via elastic polymer covalent organic frameworks monolith

Awei Hu, Yuan Zhao, Qing Hu, Chunhui Chen, Xiao Lu, Songlin Cui and Bo Liu ()
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Awei Hu: University of Science and Technology of China
Yuan Zhao: University of Science and Technology of China
Qing Hu: University of Science and Technology of China
Chunhui Chen: University of Science and Technology of China
Xiao Lu: University of Science and Technology of China
Songlin Cui: University of Science and Technology of China
Bo Liu: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Three-dimensional solar steam evaporators with efficient water purification performance have received increasing attention recently. Herein, elastic polymer covalent organic frameworks (PP-PEG) containing PEG chains with intriguing adaptability to guests are prepared by forming porphyrin rings. PP-PEG foams demonstrate full spectrum absorbance and excellent photothermal conversion properties. Through well-designed thermal management and optimization of the hydrophilicity and PEG chain length, we obtain a highly efficient solar evaporator with an evaporation rate of 4.89 kg m−2 h−1 under 1 sun in self-contained mode. The optimized solar evaporation rate is increased to 18.88 kg m−2 h−1 under 1 sun with a facile truncated cone reflector, exceeding all known solar steam evaporators. This innovative design holds immense promise for desalination and water purification owing to its simple preparation, high efficiency and durability.

Date: 2024
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DOI: 10.1038/s41467-024-53902-1

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