Two-dimensional mfi zeolite nanosheets exfoliated by surfactant assisted solution process

Aafaq Ur Rehman, Devipriyanka Arepalli, Syed Fakhar Alam, Min Zy Kim, Jungkyu Choi, Churl Hee Cho

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Two-dimensional (2D) zeolite nanosheets are important for the synthesis of high flux ze-olite membranes due to their lateral size in a preferred orientation. A way to obtain 2D zeolite nanosheets is to exfoliate interlocked structures generated during the hydrothermal synthesis. The mechanical and polymer assisted exfoliation process leads to mechanical damage in nanosheets and short lateral size. In the present study, polyvinylpyrrolidone (PVP) was introduced as an exfoliation agent and dispersant, so that multilamellar interlocked silicalite-1 zeolite nanosheets successfully exfoliated into a large lateral size (individual nanosheets 500~1200 nm). The good exfoliation behavior was due to the strong penetration of PVP into multilamellar nanosheets. Sonication assisted by mild milling helps PVP molecules to penetrate through the lamellar structure, contributing to the expansion of the distance between adjacent layers and thus decreasing the interactions between each layer. In addition, the stability of exfoliated nanosheets was evaluated with a series of organic solvents. The exfoliated nanosheets were well dispersed in n-butanol and stable for 30 days. There-fore, the PVP-assisted solution-based exfoliation process provides high aspect ratio MFI zeolite nanosheets in organic solvents for a long period.

Original languageEnglish
Article number2327
JournalNanomaterials
Volume11
Issue number9
DOIs
Publication statusPublished - 2021 Sep

Keywords

  • Colloidal stability
  • Exfoliation
  • MFI zeolite
  • PVP
  • Two-dimensional zeolite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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