Improvement of water production capacity from the air through hierarchical porous structure and polydopamine coating
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초록
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The water shortage crisis caused by climate change and global warming is intensifying domestically and internationally. As this water shortage phenomenon worsens, various studies are progressing to address the water scarcity problem. Notably, even in dry deserts, a significant amount of water molecules exist in the air in gaseous form, so research is being conducted to obtain water from air. However, the amount of water actually obtained is small, and collecting the absorbed water is challenging. In this study, multilayer PAN fiber was fabricated by laminating cellulose nanofibers (CNF) and covalent organic framework (COF), creating pores of various sizes to enhance the wettability of PAN fibers by water molecules. The fabricated PAN fiber increases the adsorption rate of water molecules from the air. Especially, coating polydopamine on a multilayer PAN fiber can obtain a photothermal conversion effect, and more than 95% of the adsorbed water can be released within several minutes.