Continuous ZIF-8/reduced graphene oxide nanocoating for ultrafast oil/water separation

•A method to fabricate continuous hydrophobic/oleophilic RGO/ZIF-8 nanocoating on polymeric foam.•Selective oil absorption with an absorption capacity of 15–35 g/g depending on the viscosity of organic solvents.•Ultrafast hexane flux up to 800,000 Lm−2 h−1 and no water flux during vacuum filtration.•Universal method to fabricate metal-organic frameworks on polymeric foam.