Janus-structured bilayer textile enabling high-efficiency salt-resistant solar desalination through directional water transport

IF 9.8 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2025-09-29 DOI:10.1016/j.desal.2025.119460

Wenyu Jia , Lei Sun , Xuewei Wang , Bo Xiong , Lijing Wang , Weilong Shi , Yan Sun , Feng Guo

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引用次数: 0

Abstract

Interfacial solar evaporation technology offers a green and sustainable approach to solving the global freshwater shortage, but salt accumulation at the evaporation interface reduces the light absorption efficiency and hinders the escape of water vapor, thereby significantly degrading the evaporation performance, which poses a key obstacle to long-term practical applications. Herein, a Janus-structured double-layer photothermal evaporator (CDs-SA-CT/DC) was designed in this study, integrating carbon dots (CDs) and sodium alginate (SA)-functionalized cotton textile (CT) photothermal layer with a directional water-transferring dustless cloth (DC), which displays an asymmetric bilayer structure of combining efficient broadband solar energy absorption with hydrodynamic conditioning. Experimental results presented that the CDs-SA-CT/DC evaporator possesses an evaporation rate of 1.82 kg m⁻² h⁻¹ at 1 solar irradiation (1 kW m⁻²) and a photothermal conversion efficiency of 79.28 %. Most importantly, the directional transport mechanism of water enabled salt ions to migrate and selectively deposit at the edges of the DC, effectively preventing interface blockage. By combining the photothermal interface with directional water transport, this Janus structural system provides a scalable salt-resistant strategy for efficient solar desalination.

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双面结构双层纺织品，通过定向输水实现高效耐盐太阳能脱盐

界面太阳能蒸发技术为解决全球淡水短缺问题提供了一条绿色可持续的途径，但蒸发界面的盐分积累降低了光吸收效率，阻碍了水蒸气的逸出，从而严重降低了蒸发性能，这是长期实际应用的关键障碍。本研究设计了一种双面结构的光热蒸发器（CDs-SA-CT/DC），将碳点（CDs）和海藻酸钠（SA）功能化的棉纺织（CT）光热层与定向转水无尘布（DC）相结合，呈现出高效宽带太阳能吸收与水动力调节相结合的不对称双层结构。实验结果表明，CDs-SA-CT/DC蒸发器在1次太阳辐照（1 kW m−2）下的蒸发速率为1.82 kg m−2 h−1，光热转换效率为79.28%。最重要的是，水的定向输运机制使盐离子迁移并选择性沉积在直流边缘，有效地防止了界面堵塞。通过将光热界面与定向水输送相结合，这种Janus结构系统为高效的太阳能脱盐提供了可扩展的耐盐策略。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.