Two-Dimensional Interlayer Space Induced Horizontal Transformation of Metal–Organic Framework Nanosheets for Highly Permeable Nanofiltration Membranes

Zheng Wang, Keizo Nakagawa, Kecheng Guan, Qiangqiang Song, Siyu Zhou, Shunsuke Tanaka, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Guangchao Li, Molly Meng Jung Li, Tomohisa Yoshioka, Hideto Matsuyama

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Laminar membranes comprising graphene oxide (GO) and metal–organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum filtration disturb the stacking of GO sheets, thus deteriorating the membrane selectivity. Therefore, to fabricate highly permeable MOF nanosheets/reduced GO (rGO) membranes, a two-step method is applied. First, using a facile solvothermal method, ZnO nanoparticles are introduced into the rGO laminate to stabilize and enlarge the interlayer spacing. Subsequently, the ZnO/rGO membrane is immersed in a solution of tetrakis(4-carboxyphenyl)porphyrin (H2TCPP) to realize in situ transformation of ZnO into Zn-TCPP in the confined interlayer space of rGO. By optimizing the transformation time and mass loading of ZnO, the obtained Zn-TCPP/rGO laminar membrane exhibits preferential orientation of Zn-TCPP, which reduces the pathway tortuosity for small molecules. As a result, the composite membrane achieves a high water permeance of 19.0 L m−2 h−1 bar−1 and high anionic dye rejection (>99% for methyl blue).

Original languageEnglish
Article number2300672
JournalSmall
Volume19
Issue number33
DOIs
Publication statusPublished - Apr 2023

Keywords

  • anionic dye removal
  • in situ transformation
  • laminar membranes
  • metal–organic framework nanosheets
  • reduced graphene oxide

ASJC Scopus subject areas

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)

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