Abstract
This study focuses on the effect of modified silica fillers by [EMIN][Tf2N] via physical adsorption on the CO2 separation performance of a mixed matrix membrane (MMM). The IL-modified silica was successfully synthesized as the presence of fluorine element was observed in both Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectrometer (XPS) analyses. The prepared MMMs with different loadings of the IL-modified silica were then compared with an unmodified silica counterpart and neat membrane. The morphology of IL-modified MMMs was observed to have insignificant changes, while polymer chains of were found to be slightly more flexible compared to their counterpart. At 2 bar of operating pressure, a significant increase in performance was observed with the incorporation of 3 wt% Sil-IL fillers compared to that of pure polycarbonate (PC). The permeability increased from 353 to 1151 Barrer while the CO2/CH4 selectivity increased from 20 to 76. The aforementioned increment also exceeded the Robeson upper bound. This indicates that the incorporation of fillers surface-modified with ionic liquid in an organic membrane is worth exploring for CO2 separation.
Highlights
The silica particles were dried in a vacuum oven at 105 ◦ C overnight to ensure the complete removal of the solvent
Silica particles were added into a beaker with 10.0 g of ethanol and [EMIM][TF2 N] (10.0 mL)
[EMIM][TF2 N], it can be observed that additional fluorine, nitrogen, and carbon elements were present while the oxygen element decreased
Summary
19.7 Barrer at 20% of silica content [11] It should, be noted that incorporating silica in a polymer matrix often leads to interfacial defects [12,13,14]. Filler surface modification is often implemented to improve the adhesion between organic/inorganic materials It is typically achieved using a modification agent that is compatible with polymer phases that chemically react with the filler and act as the bridges at the interphase [15], and silane is among the most common modification agent employed for MMMs [16,17,18,19]. MMMs using unmodified Sil particles with different loadings are prepared for comparison
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