Abstract

In this experiment, an ionic liquid (BMIMBF4) was used to prepare a composite membrane containing ZnO nanoparticles. Our previous study indicated that a composite membrane composed of ZnO and the ionic liquid (BMIMBF4) showed high CO2/N2 separation performance with a GPU of 101 and a selectivity of 42.1. The oxide layer of ZnO nanoparticles with the imidazolium ring of ionic liquid (BMIMBF4) increased the solubility of CO2 and acted as a barrier for N2, leading to an overall improvement in the performance. However, the liquid film was absorbed into support over time and became thickened, leading to instability. In order to solve this problem, a solid polymer composite film was manufactured and investigated as a solution. The polymer PEBAX2533 was used as a polymer matrix to produce a composite membrane capable of showing both high separation performance and long-term stability.

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