期刊
CHEMICAL ENGINEERING JOURNAL
卷 473, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.145484
关键词
Solar-driven interfacial evaporation; Bionic structured; Solar desalination; Photocatalysis
Inspired by the transpiration of mushrooms, researchers have developed a bionic-structured hydrogel evaporator with excellent performance and salt resistance, utilizing internal water circulation and a special structural design to reduce heat transfer.
Solar-driven interfacial evaporation desalination has emerged as a promising strategy for alleviating the water scarcity crisis. However, the design of evaporators with excellent heat management and minimal heat loss to achieve high-efficiency clean water production remains a crucial challenge. Herein, inspired by the transpiration of mushrooms in nature, we demonstrated a bionic-structured hydrogel evaporator, fabricated with biomass lotus root starch (LR), polyvinyl alcohol (PVA), and ink-modified carbon quantum dots and TiO2 (i-CQDs-TiO2). The evaporated water can be instantly replenished during evaporation through the internal water circulation of the stipe, and the special structural design reduces the transfer of heat to the water. Therefore, the evaporator demonstrates excellent performance, with a pure water evaporation rate of up to 3.78 kg.m-(2).h(-1) and an efficiency of 98% (1 kW.m(-2)). More importantly, the evaporator has excellent salt resistance with an average evaporation rate of 3.49 kg.m(-2).h(-1) in 1-25 wt% brine. In addition, without salt scaling on the evaporation surface in 10 wt% brine for continuous 5 h of illumination. Furthermore, due to the coordinated photocatalysis of i-CQDs and TiO2, the catalytic degradation rates of TB and CR were up to 91.8% and 88.9%, respectively. With an efficient and stable desalination capacity, this solar evaporator with a bionic design offers a new pathway for sustainable solar desalination.
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