Journal
ACS APPLIED POLYMER MATERIALS
Volume 2, Issue 9, Pages 3781-3788Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.0c00393
Keywords
melamine sponge; urushiol; hydrophobicity; surface modification; oil/water separation
Funding
- Natural Science Foundation of Fujian Province [2019 J05059, 2017 J01408]
- Fujian Provincial Health Education Joint Research Project [WKJ2016-2-29]
- Social Development of Instructive Program of Fujian Province [2017Y0025]
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In this work, hydrophobic sponges for highly efficient oil/water separation and oil absorption were fabricated by a simple, eco-friendly, economical, and scalable dip-coating of hydrophilic melamine sponges in urushiol (a naturally occurring small compound) solution. Because of the unique catechol group and a long alkyl side chain with unsaturated double bonds, urushiol molecules easily adhered on the sponge wall surface and selfpolymerized to form a thin hydrophobic coating layer with the assistance of heat treatment. The urushiol-modified melamine sponge (UMS) displayed a water contact angle of similar to 139 degrees and a 3D highly porous structure, so it could effectively separate oil from dynamic oil/water mixtures. The separation flux of n-hexane from an n-hexane/water mixture was as high as 18,356 +/- 2200 L.m(-2).h(-1).bar(-1). It could quickly absorb various oils and common organic solvents with an absorption capacity of up to 181 g.g(-1) and had excellent recyclability. UMS also displayed robust mechanical stability, flexibility, elasticity, and thermal stability. Therefore, the facile preparation process, low cost, and superior oil separation/absorption would endow UMS with high potential when dealing with oily wastewater.
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