Polysulfone (PSF) membrane incorporated with polyamide-tethered polyhedral OLIGOMERIC silsequioxane (POSS) for carbon dioxide separation
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Date
2017-06
Authors
Nur Izzati Binti Fitri Zaquan Tan
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Abstract
Carbon dioxide (CO2) is the main contributor to greenhouse effect since
industrial revolution. Mixed matrix membrane (MMM) has been introduced to
improve the efforts in CO2 removal. Dispersing the porous filler in polymeric matrix
can offer dramatic improvement to overcome the tradeoff limitation in between
permeability and selectivity of polymeric membrane. In this study, polysulfone
MMM incorporated with polyhedral oligomeric silsesquioxane (POSS) were
proposed to improve the permeability of CO2. The asymmetric membrane was
prepared using phase inversion method for minimum mass transfer resistance. The
effects of POSS loading (2.5-5 wt%) on the membrane characteristic and
performance were studied. Furthermore, the MMMs were modified using ionic liquid
(IL) [emim][TF2N] with 0.4 M concentration and polydimethylsiloxane (PDMS) to
improve the gas selectivity of these MMMs. The morphology of the modification
with IL by using scanning electron microscopy (SEM) proved the well dispersion of
POSS subjected to improve polymer/filler interface and Energy Dispersive X-ray
Spectroscopy (EDX) was conducted to detect elemental distributions of membrane
surface. Meanwhile Fourier Transform Infrared (FTIR) were also recorded to check
the existence bond in the sample. The gas transport properties of all fabricated
membranes were investigated using pure gas permeation tests of N2, CO2 and CH4
and further revealed the membrane with 5 wt% of POSS loading, modified by IL and
PDMS coating which exhibit satisfactory of CO2/N2 (24) and CO2/CH4 (9)