Constructing robust and magnetic PU sponges modified with Fe3O4/GO nanohybrids for efficient oil/water separation

Metal oxides, due to their low cost, environmental friendliness and wide sources, have attracted great attention. We chose iron oxide/graphene oxide (Fe3O4/GO) nanohybrids to modify a PU sponge to increase the surface roughness of the sponge without damaging its inherent structural properties. The composite was then treated with octadecane thiol to reduce the surface energy and produce a superhydrophobic and oleophilic absorption material with a water contact angle of 157 & DEG;. From the absorption experiment with simulated oily water (including diesel oil, lubricating oil, rapeseed oil, chloroform, N,N-dimethyl formamide, tetrahydrofuran, ethanol and acetone), it was found that the Fe3O4/GO-modified PU sponge could absorb up to 80-170 times its own weight while showing outstanding recyclability achieved by squeeze/absorption cycles. Moreover, the composite absorption material exhibited weak magnetic properties, suggesting its recycling practicability. These results provide a quick and simple strategy to deal with oil spills and chemical leakage.

Automated summary

Metal oxides, such as iron oxide/graphene oxide nanohybrids, have gained significant attention due to their low cost and environmental friendliness. In this study, Fe3O4/GO nanohybrids were used to modify a PU sponge, resulting in a superhydrophobic and oleophilic absorption material that could absorb up to 80-170 times its own weight of simulated oily water. The modified sponge also exhibited outstanding recyclability and weak magnetic properties, making it a promising material for dealing with oil spills and chemical leakage.