期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 634, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127972
关键词
Trisiloxane; Melamine sponges; Hydrophobicity; Polydopamine
资金
- National Natural Science Foundation of China [21862009, 21563016]
- Jiangxi Provincial Natural Science Foundation [20202BABL203011]
3Si-MS sponges with highly hydrophobic properties were successfully fabricated by forming a polydopamine layer with nanoaggregates and covalently grafting trisiloxane onto the surface of melamine sponges. These sponges exhibited a hierarchical structure with high-density nanoaggregates, strong absorption capacity, ease of reusability, and suitability for continuous oil-water separation.
The trisiloxane modified melamine sponges (3Si-MS) have been successfully fabricated via the formation of polydopamine (PDA) layer with nanoaggregates and the covalent grafting of 3-mercaptopropyltrisiloxane. The 3Si-MS were confirmed and verified by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), attenuated total reflection Fourier transform infrared spectroscopy (ATR FT-IR), contact angle, the separation/adsorption tests and recyclability tests. As investigated by SEM, 3Si-MS exhibited 3D hierarchical structure with high density of nanoaggregates on the interconnected skeleton of melamine sponges. By combining the shorter and wider hydrophobic group of trisiloxane and hierarchically rough structure, 3Si-MS illustrated highly hydrophobic (water contact angle of 139.3 degrees), outstanding absorption capacity, and easy reusability. Meanwhile, 3Si-MS could be used for continuous oil-water separation. The results of this work demonstrate a facile and cost-effective method to prepare highly hydrophobic melamine sponges for oil-water separation.
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