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All-regional highly efficient moisture capturing and sunlight driven steam generation
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DOI：10.1016/j.watres.2025.123398.png)
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Abstract
En 中文
Utilizing solar energy to extract and purify potable water from atmospheric humidity offers a viable approach to combat water scarcity in diverse geographical areas. However, current technologies face challenges related to low efficiency due to the low intrinsic permeability and weak hydrophilicity of H2O, followed by ineffectiveness in diverse climatic conditions and long-lasting implementation. Herein, we develop a highly hygroscopic photothermal hydrogels consisting of chitosan polypyrrole (CP) copolymer matrix and zinc ions (Zn2+). The chelation of Zn2+ with CP avoids ionic leakage and endows the hierarchically porous hydrogel with strong hydration and moisture-absorbing properties. These hydrogels achieve an effective moisture capturing of up to 6.53 g g- 1 in a wide humidity range of 30% to 90%, which are the reminiscence of environment including desert and lakes. Furthermore, the grafting of photothermal polypyrrole to chitosan allowed the sunlight-driven steam generation with 87% efficiency of solar energy without additional power input. The recyclable moisture adsorption and desorption procedures maintain without observable deduction in efficiency over 2 weeks. A potable device containing our sunlight-driven antibacterial hydrogels displays the production of 1.3 kg m-2 drinkable water per day, sufficient to meet the needs of a household. Its potential for application across diverse climatic conditions could refine water harvesting practices and guide future research on system optimization and scalability.
Keywords:
Moisture capturing
Photothermal hydrogel
Sunlight-driven
Steam generation
Water purification
Journal
IF:
12.4
Papers:
3.0W
Citations:
15.7W
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