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

Dae Woo Kim, Kiwon Eum, Hanim Kim, Daeok Kim, Matheus Dorneles de Mello, Kangho Park, Michael Tsapatsis

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Continuous ZIF-8/reduced graphene oxide (RGO)nanocoating is fabricated by growing ZIF-8 on RGO-coated polyurethane (PU)foam. Surface modification of PU foam can be easily achieved by immersing the PU foam in GO solution, followed by mild thermal treatment to turn the GO layer into RGO layer. Adhesion between polymer foam and ZIF-8 layer was enhanced by the inserted RGO layer because oxygen-containing groups of RGO could interact with Zn 2+ precursor of ZIF-8 localizing the layer growth preferentially on the surface of RGO. The synergetic hydrophobic/oleophilic properties of RGO and ZIF-8 enable selective oil absorption of PU foam with an absorption capacity of 15–35 g/g depending on the viscosity of organic solvents. Most of all, the ZIF-8/RGO coated PU foam can filter organic solvent selectively via vacuum filtration, showing ultrafast hexane flux up to 800,000 Lm −2 h −1 and no water flux.

Original languageEnglish (US)
Pages (from-to)509-515
Number of pages7
JournalChemical Engineering Journal
StatePublished - Sep 15 2019

Bibliographical note

Funding Information:
This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2015R1A6A3A04057367 ). The authors declare no conflict of interest to this work.


  • Coating
  • Composite
  • Graphene
  • Metal-organic frameworks
  • Oil recovery

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