Fabrication of TiO2-GO/PI Mixed Matrix Membranes by In-situ Polymerization and Their Gas Permeation Property†

doi:10.7503/cjcu20160678

Abstract

Abstract:

Titanium dioxide-graphene oxide(TiO₂-GO) nanocomposites were synthesized by impregnation-reduction method using tetrabutyl titanate(C₁₆H₃₆O₄Ti) as the source of TiO₂, then TiO₂-GO/polyimide(TiO₂-GO/PI) mixed matrix membranes were fabricated via in-situ polymerization with 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)/4,4'-oxydianiline(ODA)/TiO₂-GO. The structures of TiO₂-GO nanocomposites and TiO₂-GO/PI mixed matrix membranes were characterized by Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy and transmission electron microscopy(TEM), scanning electron microscope(SEM), thermo-gravimetric analysis(TGA) and zeta potential instrument. The effects of TiO₂-doping on the structure of TiO₂-GO nanocomposites and TiO₂-GO/PI mixed matrix membranes were discussed, and the gas permeation properties of the mixed matrix membranes were measured. The results reveal that TiO₂ nanoparticles are impregnated uniformly in GO nanosheets, the dope of TiO₂ would slightly destroy the structure of GO, and the disorder degree of GO structure increased. But the dope of TiO₂ which was helpful to improve the dispersion of TiO₂-GO nanocomposite in the mixed matrix membrane, thus enhance the gas permeation properties of the mixed matrix membrane. However, the excess of TiO₂-doping would lead to the aggregation of TiO₂ particles on the GO surface, which depressed the gas permeation properties of the mixed matrix membrane. When the mass fraction of TiO₂-doping reached 15% in TiO₂-GO nanocomposite, the mixed matrix membrane demonstrated good CO₂ permeability and CO₂/N₂ permeation selectivity, and CO₂ permeability was 360 Barrer, and CO₂/N₂ permeation selectivity reached 31.

Key words: TiO2-graphene oxide nanocomposite, Polyimide, Mixed matrix membrane, In-situ polymerization, Gas permeation property

CLC Number:

O631

TrendMD:

YANG Caihong, MAN Chunli, XUE Wanlei, WANG Ting, CHEN Di, CHEN Qian, WU Liguang. Fabrication of TiO₂-GO/PI Mixed Matrix Membranes by In-situ Polymerization and Their Gas Permeation Property^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 686.

Figures/Tables 9

Fig.1 Schematic of gas permeation experimental setup1. H2; 2. CO2; 3. N2; 4. H2; 5. thermostatic water bath; 6. permeation cell; 7. soap-film flow-meter; 8. GC; 9. membrane; 10. porous metal disk; 11. O-ring(seal).

Fig.2 FTIR spectra of GO(a), TiO2-GO(Ⅰ)(b), TiO2-GO(Ⅱ)(c) and TiO2-GO(Ⅲ)(d) nanocomposites

Fig.3 Raman spectra of GO(a), TiO2-GO(Ⅰ)(b), TiO2-GO(Ⅱ)(c) and TiO2-GO(Ⅲ)(d) nanocomposites

Fig.4 TEM images of GO(A), TiO2 nanoparticles(B), TiO2-GO(Ⅰ)(C), TiO2-GO(Ⅱ)(D) and TiO2-GO(Ⅲ)(E) nanocomposites

Fig.5 Images of PI membrane(A), GO/PI nanocomposite(B), TiO2-GO/PI(Ⅰ)(C), TiO2-GO/PI(Ⅱ)(D) and TiO2-GO/PI(Ⅲ)(E) mixed matrix membranes

Fig.6 SEM images of GO/PI(A), TiO2-GO/PI(Ⅰ)(B), TiO2-GO/PI(Ⅱ)(C) and TiO2-GO/PI(Ⅲ)(D) mixed matrix membranes

Fig.7 Zeta potential and water contact angle of PI membrane(a), GO/PI nanocomposite(b), TiO2-GO/PI(Ⅰ)(c), TiO2-GO/PI(Ⅱ)(d) and TiO2-GO/PI(Ⅲ)(e) mixed matrix membranes

Fig.8 TGA of PI membrane(a), TiO2-GO/ PI(Ⅰ)(b), TiO2-GO/PI(Ⅱ)(c) and TiO2-GO/PI(Ⅲ)(d) mixed matrix membranes

Fig.9 CO2, N2 permeability and CO2/N2 permeation selectivity of PI member(a), GO/PI(b), TiO2-GO/PI(Ⅰ)(c), TiO2-GO/PI(Ⅱ)(d) and TiO2-GO/PI(Ⅲ)(e) mixed matrix membranes

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Fabrication of TiO₂-GO/PI Mixed Matrix Membranes by In-situ Polymerization and Their Gas Permeation Property^†

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