Polysulfone (PSF)Silicoaluminophosphate (SAPO-34) membrane incorporated with 1-ethyl-3 methylimidazoliumbis (TRIFLUOROMETHYSULFONYL) Imide [EMIM][TF2N] for carbon dioxide separation
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Date
2018-06
Authors
Ng, Won Huei
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Abstract
Carbon dioxide (CO2) is the main contributor to greenhouse effect since industrial
revolution. Ionic liquids (ILs) have been extensively studied in the recent years to
improve the performance of CO2 separation due to the high CO2 solubility and selectivity.
In this study, imidazolium-based ionic liquid was used to improve and functionalise the
interface between polysulfone (PSf) and SAPO-34 zeolite in the asymmetric mixed
matrix membrane (MMM) which was prepared by phase inversion method for minimum
mass transfer resistance. PSf/SAPO-34 MMMs were post-modified by immersing the
membranes into IL solution (1-Ethyl-3 Methylimidazoliumbis (Trifluoromethysulfonyl)
Imide). The main objective of this work is to study the effects of IL concentration on the
membrane morphology and separation performance in CO2. The morphology of the IL
modification by using scanning electron microscopy (SEM) proved the well dispersion
of SAPO-34 subjected to improve polymer/filler interface. The fourier transform infrared
spectra (FTIR) were also confirmed that IL was successfully incorporated into MMM and
recorded to check the existence bond in the membrane sample. The post-impregnation of
the membrane with IL improved the interface contact between the polymer and zeolite.
The interface sealing using 0.2M IL enhanced the CO2 permeance, both of the CO2/N2
and CO2/CH4 selectivity of IL-modified MMM, about 319.73 %, 601.69 % and 605.84 %
higher than the CO2/N2 and CO2/CH4 selectivity of unmodified MMMs.