Superhydrophobic/superoleophilic polyurethane sponge(PUR) was fabricated by dip-coating PUR with the hydrophobic solution and Fe3O4 dispersion.The surface morphology and chemical compositions of the sponge were analyzed by SEM,EDS and FT-IR.Moreover,the effect of dipping of alkali solution on the wettability of the PUR was studied.Their oil-water separation performance was also investigated.The results showed that the sponge obtained superhydrophobicity/superoleophilicity after dip-coating the hydrophobic solution and Fe3O4 dispersion,and the contact angles for water and oil were 154.6° and 0°,respectively.After dipping by alkali solution,the lower surface of the sponge was switched to the superhydrophilic/underwater oleophobic state,and the switching was very rapid.However,the upper surface of the sponge still remained superhydrophobic/superoleophilic.The sponge showed good separation performance for immiscible oil-water mixture.And it had favorable magnetic separation performance.
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基金资助
中国纺织工业联合会科技指导项目(2018039,2020022)
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