Abstract
Graphene (GN) is a two-dimensional carbon material with highly hydrophobic and oleophilic properties, and it is prepared by a modified Hummers Method. In this study, superhydrophobic and superoleophilic polyurethane (PU) sponge was fabricated by coating graphene onto it. The contact angle of the coated sponge was as large as 156.1° for water, and 0° for pump oil, soybean oil, and diesel oil. The absorption capability of the coated sponges was up to 60 times their own weight. Additionally, the coated PU sponges could be reused for oil–water separation for more than 60 cycles without losing their superhydrophobic-superoleophilic properties. Therefore, the sponges can be used for the cleanup of oil spills from a water surface.
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