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In this study, a fully biobased benzoxazine monomer (E-s) was combined with SiO2 nanoparticles to construct superhydrophobic/superoleophilic coatings on polyethylene terephthalate fabrics by spray coating and thermal curing. The resulting PE-s/SiO20.2 fabric possessed special wettability with a water contact angle of 156.2 ± 1.5° and a sliding angle of 5.2 ± 1.0°, and it exhibited great adhesion strength under ultrasonication. Furthermore, PE-s/SiO20.2 fabrics achieved ultrafast and efficient separation with average oil fluxes of around 45,000 L/m2 h and separation efficiencies over 93% for several oil/water mixtures. In addition, PE-s/SiO20.2 fabrics showed strong durability under several types of harsh treatment. Both their superwettability and separation performance were steadily preserved after immersion in acidic/alkaline solutions with pH values of 1–11 for 1 h, solvent immersion for 100 h, and 44 cycles of abrasion. Finally, a simple rinsing operation was explored to clean polluted PE-s/SiO20.2 fabrics.

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