Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection

Interfacial solar vapor generation (ISVG) is an emerging technology to alleviate the global freshwater crisis. However, high-cost, low freshwater collection rate, and salt-blockage issues significantly hinder the practical application of solar-driven desalination devices based on ISVG. Herein, with...

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Veröffentlicht in:Environmental science & technology 2024-04, Vol.58 (17), p.7335-7345
Hauptverfasser: Tian, Yankuan, Jiang, Yifei, Zhu, Ruishu, Yang, Xin, Wu, Dequn, Wang, Xueli, Yu, Jianyong, Li, Yiju, Gao, Tingting, Li, Faxue
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container_end_page 7345
container_issue 17
container_start_page 7335
container_title Environmental science & technology
container_volume 58
creator Tian, Yankuan
Jiang, Yifei
Zhu, Ruishu
Yang, Xin
Wu, Dequn
Wang, Xueli
Yu, Jianyong
Li, Yiju
Gao, Tingting
Li, Faxue
description Interfacial solar vapor generation (ISVG) is an emerging technology to alleviate the global freshwater crisis. However, high-cost, low freshwater collection rate, and salt-blockage issues significantly hinder the practical application of solar-driven desalination devices based on ISVG. Herein, with a low-cost copper plate (CP), nonwoven fabric (NWF), and insulating ethylene–vinyl acetate foam (EVA foam), a multistage device is elaborately fabricated for highly efficient simultaneous freshwater and salt collection. In the designed solar-driven device, a superhydrophobic copper plate (SH-CP) serves as the condensation layer, facilitating rapid mass and heat transfer through dropwise condensation. Moreover, the hydrophilic NWF is designed with rational hydrophobic zones and specific high-salinity solution outlets (Design-NWF) to act as the water evaporation layer and facilitate directional salt collection. As a result, the multistage evaporator with eight stages exhibits a high water collection rate of 2.25 kg m–2 h–1 under 1 sun irradiation. In addition, the desalination device based on the eight-stage evaporator obtains a water collection rate of 13.44 kg m–2 and a salt collection rate of 1.77 kg m–2 per day under natural irradiation. More importantly, it can maintain a steady production for 15 days without obvious performance decay. This bifunctional multistage device provides a feasible and efficient approach for simultaneous desalination and solute collection.
doi_str_mv 10.1021/acs.est.3c10450
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However, high-cost, low freshwater collection rate, and salt-blockage issues significantly hinder the practical application of solar-driven desalination devices based on ISVG. Herein, with a low-cost copper plate (CP), nonwoven fabric (NWF), and insulating ethylene–vinyl acetate foam (EVA foam), a multistage device is elaborately fabricated for highly efficient simultaneous freshwater and salt collection. In the designed solar-driven device, a superhydrophobic copper plate (SH-CP) serves as the condensation layer, facilitating rapid mass and heat transfer through dropwise condensation. Moreover, the hydrophilic NWF is designed with rational hydrophobic zones and specific high-salinity solution outlets (Design-NWF) to act as the water evaporation layer and facilitate directional salt collection. As a result, the multistage evaporator with eight stages exhibits a high water collection rate of 2.25 kg m–2 h–1 under 1 sun irradiation. 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Moreover, the hydrophilic NWF is designed with rational hydrophobic zones and specific high-salinity solution outlets (Design-NWF) to act as the water evaporation layer and facilitate directional salt collection. As a result, the multistage evaporator with eight stages exhibits a high water collection rate of 2.25 kg m–2 h–1 under 1 sun irradiation. In addition, the desalination device based on the eight-stage evaporator obtains a water collection rate of 13.44 kg m–2 and a salt collection rate of 1.77 kg m–2 per day under natural irradiation. More importantly, it can maintain a steady production for 15 days without obvious performance decay. 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subjects Acetic acid
Collection
Condensates
Condensation
Copper
Desalination
Ethylene vinyl acetates
Evaporation
Evaporators
Fresh water
Heat transfer
Hydrophobicity
Irradiation
Metal plates
Nonwoven fabrics
Radiation
Salts
Sustainable Systems
Vinyl acetate
Water transport
title Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection
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