期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 646, 期 -, 页码 141-149出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.05.035
关键词
Melamine sponge; Au nanoparticles; Interfacial solar evaporation; Silicone nanoparticles; Salt-resistance
Silicone nanoparticles were deposited onto melamine sponge and modified with polypyrrole and Au nanoparticles to fabricate highly saltresistant solar evaporators for stable long-term desalination and water harvesting. These solar evaporators have a superhydrophilic hull for water transport and solar desalination, and a superhydrophobic nucleus for reducing heat loss. They achieved spontaneous rapid salt exchange and reduction in salt concentration gradient due to ultrafast water transport and replenishment in the superhydrophilic hull with a hierachical micro-/nanostructure, effectively preventing salt deposition during interfacial solar-driven evaporation (ISE). These solar evaporators demonstrated long-term stable evaporation performance and the ability to collect fresh water without any salt precipitation.
Interfacial solar-driven evaporation (ISE) is one of the most promising solutions for collecting fresh water, however, poor salt-resistance severely limits the long-term stability of solar evaporators. Here, highly saltresistant solar evaporators for stable long-term desalination and water harvesting were fabricated by depositing silicone nanoparticles onto melamine sponge, and then modifying the hybrid sponge sequentially with polypyrrole and Au nanoparticles. The solar evaporators have a superhydrophilic hull for water transport and solar desalination, and a superhydrophobic nucleus for reducing heat loss. Spontaneous rapid salt exchange and reduction in salt concentration gradient were achieved due to ultrafast water transport and replenishment in the superhydrophilic hull with a hierachical micro-/nanostructure, which effectively prevents salt deposition during ISE. Consequently, the solar evaporators have long-term stable evaporation performance of 1.65 kg m-2h-1 for 3.5 wt% NaCl solution under 1 sun illumination. Moreover, 12.87 kg m- 2 fresh water was collected during consecutive 10 h ISE of 20 wt% brine under 1 sun without any salt precipitation. We believe that this strategy will shed a new light on the design of long-term stable solar evaporators for fresh water harvesting.
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