Journal
NANOPHOTONICS
Volume 9, Issue 15, Pages 4601-4608Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0396
Keywords
interfacial solar evaporation; rGO membrane; salt rejection
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Funding
- National Key Research and Development Program of China [2017YFA0205700]
- National Natural Science Foundation of China [61735008, 11874211]
- Fundamental Research Funds for the Central Universities [021314380140]
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Interfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m(-2) h(-1) (solar-thermal conversion efficiency similar to 79%) under one sun, out of 3.5 wt% brine. More strikingly, due to the tailored narrow interlayer spacing, the rGO membrane can effectively reject ions, preventing salt accumulation even for high salinity brine (similar to 8 wt% concentration). With enabled saltantifouling capability, flexibility, as well as stability, our rGO membrane serves as a promising solar evaporator for high salinity brine treatment.
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