Carbon nanotube-supported graphene oxide nanoribbon bilayer membrane for high-performance diafiltration

Yunkyu Choi, Junhyeok Kang, Eunji Choi, Ju Yeon Kim, Jeong Pil Kim, Ji Hoon Kim, Ohchan Kwon, Dae Woo Kim

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We demonstrate the significantly enhanced molecular separation performance of stacked graphene oxide nanoribbon (GONR) membranes with a carbon nanotube (CNT) supporting layer. Functionalized CNTs (FCNTs) are prepared for the bilayer membrane by partially oxidizing CNTs with KMnO4, which can be dispersed in various solvents and water up to 40 mg/mL without the addition of a surfactant. The concentrated FCNT dispersion is viscous and can be coated on porous polymeric support using a scalable bar-coating method. When a selective GONR layer is vacuum filtrated onto the FCNT-coated support, the membrane can filter organic dye molecules with a 100% rejection rate, while allowing fast penetration of small ions and water, resulting in an excellent diafiltration performance with a separation factor of 950 and water flux of 138 LMH. Due to the strong adhesion of FCNTs and GONRs on polymeric support, the membrane can be operated at high pressures (up to 30 bar) and under continuous cross-flow conditions.

Original languageEnglish
Article number131805
JournalChemical Engineering Journal
Publication statusPublished - 2022 Jan 1

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2020R1C1C1003289) and the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2019R1A6A1A11055660).

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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