期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104701
关键词
hydrogel paint; oil; water separation; polyvinyl alcohol; tannic acid; ultra-high strength hydrogels
类别
资金
- National Natural Science Foundation of China [52173068, 51773028, 52073039]
- Fundamental Research Funds for the Central Universities [ZYGX2019J026]
- Sichuan Science and Technology Program [2020YFG0100, 2019YJ0197, 2019YFG0056, 2021YFH0023]
- International Science and Technology Cooperation Project from Chengdu municipal government [2019-GH02-00037-HZ]
A strategy of using ethanol to dynamically regulate hydrogen bond crosslinking between PVA and TA is proposed to prepare a hydrogel paint, which shows ultra-high strength, swelling volume stability, and excellent oil-water separation efficiency. The mechanism involves re-establishment of intermolecular hydrogen bond mediated cross-linking during ethanol evaporation, offering new insights for scalable fabrication of hydrogel-coated porous materials for oil/water separation in industrial scenarios.
Hydrogel modified porous matrix with the super-wetting surface (i.e., super-hydrophilic/underwater super-oleophobic) is ideal for oil/water separation. However, the deterioration in mechanical strength and separation efficiency during the swelling process and complicated synthesis procedure limits its industrial application. In this study, a strategy of using ethanol to dynamically regulate the hydrogen bond crosslinking between polyvinyl alcohol (PVA) and tannic acid (TA) is proposed to prepare a hydrogel paint, which can be simply applied on the porous substrate surface by different one-step operations (dipping, brushing, spraying, etc.) without additional cross-linking. The underline mechanism is attributed to the re-establishment of intermolecular hydrogen bond mediated cross-linking between PVA and TA during ethanol evaporation. Consequently, the resultant hydrogel coating exhibits ultra-high strength (>10 MPa), swelling volume stability, and excellent oil-water separation efficiency (>99%). This study will provide new insights into the scalable fabrication of hydrogel-coated porous materials for oil/water separation in industrial scenarios.
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