期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 16, 页码 19467-19475出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02026
关键词
carbonized biomass; solar-thermal conversion; water desalination; interfacial evaporation; hydrophobic-hydrophilic Janus structure
资金
- National Natural Science Foundation of China (NSFC) [51772121, 51975245]
- Jilin Provincial Science & Technology Department [20200401126GX, 20190303039SF]
A bioinspired hydrophilic-hydrophobic Janus hybrid system was constructed for efficient solar steam generation and water evaporation, with the added benefit of effective sewage purification.
Solar energy has received extensive attention as a renewable and sufficient energy source. Herein, inspired by the Janus wettability of lotus leaves, we have constructed a bioinspired hydrophilic-hydrophobic Janus hybrid system of carbonized carrot powder (CC powder)-modified cotton cloth with Nafion coating on one side (cotton cloth-NCC) for highly efficient solar steam generation. In cotton cloth-NCC, CC powder functions as a light absorber to achieve high light absorption, whereas the hydrophilic cotton cloth ensures efficient water transport. Meanwhile, the coating of Nafion establishes a hydrophobic-hydrophilic Janus structure, which can not only modulate water supply but also prevent salt deposition even with the high-concentration salt solution. The cotton cloth-NCC has been further shaped into a waved structure (w-cotton cloth-NCC) to increase the water evaporation area and achieve high light absorption (95%). Under 1 sun irradiation, w-cotton cloth-NCC yields a pure water steam generation rate of 1.88 kg m(-2) h(-1) and a seawater evaporation rate of 1.52 kg m(-2) h(-1). Furthermore, the w-cotton cloth-NCC also has a good purification effect on sewage: Escherichia coli can be completely removed, and the removal rate of Rhodamine B reaches 98.3%. The simple approach presented here for the construction of a highefficient, low-cost, environmentally sustainable, long-term stable hydrophobic-hydrophilic Janus solar steam evaporator holds great promise for application in both environmental purification and photothermal conversion.
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