Utilizing Covalent Triazine Framework (CT-1) Loading for CT-1/Polysulfone Mixed Matrix Membrane for CO2

Abstract

The growing need for carbon dioxide (CO₂) removal in various industrial sectors has led researchers to focus on the positive features of mixed matrix membranes (MMMs). Covalent triazine frameworks (CT-1) and polysulfone (PSF) were both used in the creation of MMMs. Due to the high porosity, significant area of surface, uniform dimension of pores, and thermal and chemical resistance, CT-1 was selected. The newly developed CT-1/PSF MMMs were prepared with different CT-1 loadings (0, 0.1, 0.3, 0.8, 1.1, and 1.5 wt %) in dope solution. The performance of membranes was evaluated using FTIR, FESEM, TGA, mechanical properties, and gas separation tests. In pure gas tests, the CO₂ permeance and ideal CO₂/N₂ and CO₂/CH₄ selectivity increased when CT-1 loading was increased from 0 to 0.8 wt %. MMMs confirmed 109.12 and 91.42% increases in CO₂/N₂ and CO₂/CH₄ selectivities compared to pure PSF, respectively. However, a further increase in CT-1 loading beyond 0.8 wt % led to a drop in ideal selectivity. CO₂ permeance and selectivity were reduced with pressure (2, 3, 4, and 5 bar). Additionally, investigated the effect of the feed stream (3/97 vol % of CO₂/CH₄) on CO₂ separation. This paper describes a new technique for improving the ability of mixed matrix membranes through CT-1 fillers.