海水淡化
结晶
卤水
太阳能淡化
材料科学
蒸发
润湿
化学工程
蒸发器
复合材料
化学
机械工程
气象学
物理
工程类
膜
有机化学
热交换器
生物化学
作者
X. Dong,Hao Li,L.X. Gao,Chaoji Chen,Xiaowen Shi,Yumin Du,Hongbing Deng
出处
期刊:Small
[Wiley]
日期:2022-02-10
卷期号:18 (13)
被引量:68
标识
DOI:10.1002/smll.202107156
摘要
Abstract Solar desalination has been recognized as an emerging strategy for solving the pressing global freshwater crisis. However, salt crystallization at the photothermal interface frequently causes evaporator failure. In addition, arbitrary discharge of concentrated brine produced during desalination results in potential ecological impacts as well as wastage of valuable minerals. In the present work, a suspended‐type evaporator (STEs) constructed using Janus fibrous mats is reported. The fibrous structure wicks brine to the evaporation layer and the salt gets confined in the evaporation layer until crystallization for zero liquid discharge due to the suspended design. Enhanced evaporation is observed because STEs have an additional low‐resistance vapor escape path directly from the evaporation layer to the atmosphere compared to traditional floating Janus evaporators. Moreover, owing to the drastically different wettability on both sides, the evaporator allows salt crystallization only on the hydrophilic bottom layer, thus eliminating salt accumulation at the hydrophobic photothermal interface. With this unique structural design, the proposed evaporator not only maintains a high evaporation rate of 1.94 kg m –2 h –1 , but also demonstrates zero liquid discharged salt resistance and ideal recovery of the mineral in brine.
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