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Architecting Janus hydrogel-fabric coupled evaporator for eliminating salt accumulation and highly efficient solar-driven brine desalination.
- Source :
-
Desalination . Jun2023, Vol. 556, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Here, a novel Janus photothermal hydrogel-fabric was developed by firmly formatting surface hydrophobized porous photothermal hydrogel on a commercial cotton fabric in large area. This Janus-architected hydrogel-fabric not merely inherits the "water activation" effect of hydrogel-based evaporator, but also combines the good mechanical property of cotton fabric. In laboratory evaporation under 1 sun illumination (1 kW m−2), this novel hydrogel-fabric coupled evaporator achieved evaporation rate up to 1.60 kg m−2 h−1 from pure water, as well as 1.55 kg m−2 h−1 from 3.5 wt% NaCl solution, exceeding the theoretical limit of plane evaporators. It also has been confirmed no salt accumulation on the photothermal hydrogel-fabric surface and no evaporation performance degradation occurring in the multicycle long-time continuous evaporation testing in saline water and simulated industrial dyeing water. Additionally, 6.3 kg m−2 of freshwater was produced from 3.5 wt% NaCl solution in 9 h under natural sunlight (average 0.46 sun, Sep. 23th 2022 in Shanghai, China), showing a great potential to seawater desalination for freshwater supply in the coastal and insular area. Considering the simple process in large-scale preparation, and efficient but also stable solar evaporation performance, this novel hydrogel-fabric coupled evaporator could promote the solar evaporation technology to large-scale application in real industrial fields. • Janus-structured hydrogel-fabric coupled evaporator is facilely prepared. • Evaporation enthalpy of water on the hydrogel-fabrics is effectively reduced. • No salt accumulation on the Janus hydrogel-fabric coupled evaporator • Continuous evaporation in 3.5 wt% brine shows a constant evaporation rate. • 9 h out-door solar evaporation achieves 6.3 kg m−2 of freshwater from 3.5 wt% brine. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00119164
- Volume :
- 556
- Database :
- Academic Search Index
- Journal :
- Desalination
- Publication Type :
- Academic Journal
- Accession number :
- 162919442
- Full Text :
- https://doi.org/10.1016/j.desal.2023.116567