Thermally-induced pore size tuning of multilayer nanoporous graphene for organic solvent nanofiltration

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

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Graphene-based materials have been used for fabricating organic solvent nanofiltration membranes due to their excellent mechanical properties and chemical stability in organic solvents. However, graphene membranes exhibit low organic solvent permeation properties due to the large molecular size of the organic solvent molecules and their strong interactions with the graphene surface. Herein, a nanoporous graphene membrane was fabricated to enhance organic solvent permeation. Nanopores were generated on the basal plane of graphene by rapid thermal annealing of graphene oxide. The size of the nanopores was also tuned from micropores to nanopores by adjusting the activation temperatures. The optimized nanoporous graphene membrane showed ultrafast isopropyl alcohol permeance up to 295 Lm−2h−1bar−1 and a sharp molecular weight cut-off of 616 Da. The membrane showed excellent stability and diafiltration performance under cross-flow filtration with a separation factor of around 1000 for dye molecules mixed in isopropyl alcohol.

Original languageEnglish
Article number119620
JournalJournal of Membrane Science
Publication statusPublished - 2021 Nov 1

Bibliographical note

Funding Information:
This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) ( NRF-2020R1C1C1003289 ), the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education ( NRF-2019R1A6A1A11055660 ), and also in part by Samsung Electronics. This research was supported by an internal grant (code: 20200543 ) form the Korea Institute of Civil Engineering and Building Technology (KICT) .

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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