Hollow ZIF-8 nanoparticles improve the permeability of mixed matrix membranes for CO2/CH4 gas separation

Sinyoung Hwang, Won Seok Chi, Su Jin Lee, Sang Hyuk Im, Jong Hak Kim, Jinsoo Kim

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Solvothermal surface coating was employed to form hetero-nanostructures consisting of a polystyrene (PS) core and ZIF-8 shell. Upon selective removal of the PS core, hollow zeolite imidazole frameworks (H_ZIF-8) with a particle size of 700nm and surface area of 1528.5m2/g were generated. Synthesis was confirmed by Field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) analysis. Free-standing mixed matrix membranes (MMMs) were prepared by dispersing H_ZIF-8 filler in poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer matrix. PVC-g-POEM worked well as a robust matrix to homogeneously disperse H_ZIF-8 with good interfacial contact due to the microphase-separated, amphiphilic properties of the hydrophobic glassy PVC main chains and the hydrophilic rubbery POEM side chains. Secondary bonding interactions were responsible for the good interfacial properties of the MMMs, as confirmed by Fourier-transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), FE-SEM, and XRD analysis. MMMs exhibited significantly enhanced CO2 permeability relative to pure PVC-g-POEM membranes: an 8.9-fold increase in permeability from 70.0 to 623Barrer (1Barrer=1×10-10cm3 (STP)˙cm/cm2scmHg) with only a small decrease in CO2/CH4 selectivity from 13.7 to 11.2 at 35°C, as measured via the time-lag method.

Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalJournal of Membrane Science
Volume480
DOIs
Publication statusPublished - 2015 Apr 5
Externally publishedYes

Fingerprint

Nanoparticles
hollow
Permeability
permeability
Gases
membranes
Membranes
nanoparticles
Polystyrenes
matrices
gases
X-Ray Diffraction
Field emission
Electron Scanning Microscopy
chlorides
field emission
polystyrene
Zeolites
Scanning electron microscopy
Nanostructures

Keywords

  • CO
  • Graft copolymer
  • Hollow
  • Mixed matrix membrane (MMM)
  • Zeolite imidazole framework (ZIF)

ASJC Scopus subject areas

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

Cite this

Hollow ZIF-8 nanoparticles improve the permeability of mixed matrix membranes for CO2/CH4 gas separation. / Hwang, Sinyoung; Chi, Won Seok; Lee, Su Jin; Im, Sang Hyuk; Kim, Jong Hak; Kim, Jinsoo.

In: Journal of Membrane Science, Vol. 480, 05.04.2015, p. 11-19.

Research output: Contribution to journalArticle

Hwang, Sinyoung ; Chi, Won Seok ; Lee, Su Jin ; Im, Sang Hyuk ; Kim, Jong Hak ; Kim, Jinsoo. / Hollow ZIF-8 nanoparticles improve the permeability of mixed matrix membranes for CO2/CH4 gas separation. In: Journal of Membrane Science. 2015 ; Vol. 480. pp. 11-19.
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AU - Hwang, Sinyoung

AU - Chi, Won Seok

AU - Lee, Su Jin

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AU - Kim, Jong Hak

AU - Kim, Jinsoo

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