期刊
ENERGY & ENVIRONMENTAL MATERIALS
卷 5, 期 2, 页码 617-626出版社
WILEY
DOI: 10.1002/eem2.12199
关键词
solar steam generation; waste polyester; hierarchically porous carbon; desalination; freshwater production
资金
- National Natural Science Foundation of China [51903099, 51991353]
- Huazhong University of Science and Technology [3004013134]
- 100 Talents Program of the Hubei Provincial Government
- Innovation and Talent Recruitment Base of New Energy Chemistry and Device [B21003]
The novel bilayer solar evaporator designed with wood and low-cost porous carbon exhibits high evaporation rate, stability, and salt resistance, and is able to convert seawater into freshwater outdoors to meet daily water consumption needs.
Wood-based bilayer solar evaporators, which possess cooperative advantages of natural wood and photothermal conversion coating including fast water transportation, low heat conduction, renewability, and high light absorbability, hold great promise for water purification. However, previous studies suffer from low evaporation rates and high cost of coatings, and lack a deep understanding how the porous structures of coating layer function. Herein, a novel bilayer solar evaporator is designed through facile surface coating of wood by low-cost porous carbon from controlled carbonization of polyester waste. The porous carbon bears rich oxygen-containing groups, well-controlled micro-/meso-/macropores, and high surface areas (1164 m(2) g(-1)). It is proved that porous carbon improves sunlight absorption and promotes the formation of numerous water clusters to reduce water evaporation enthalpy. Owing to these combined features, the bilayer solar evaporator exhibits high evaporation rate (2.38 kg m(-2) h(-1)), excellent long-term stability, and good salt resistance. More importantly, a large-scale solar desalination device for outdoor experiments is developed to produce freshwater from seawater. The daily freshwater production amount (3.65 kg m(-2)) per unit area meets the daily water consumption requirement of one adult. These findings will inspire new paradigms toward developing efficient solar steaming technologies for desalination to address global freshwater shortage.
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