Enhanced CO2 separation properties using mixed matrix membranes incorporating triazole-functionalized graphene oxide via click chemistry

Abstract

Triazole-functionalized graphene oxide (Tz@GO) nanosheets were incorporated into an EXTEM® XH 1015 polyetherimide to fabricate mixed matrix membranes (MMMs). Tz@GO was synthesized through a simple three-step click chemistry approach. The physicochemical properties of the EXTEM® polymer membranes were analysed before and after Tz@GO incorporation using various analytical techniques. Cross-sectional morphology analysis of the MMMs demonstrated a well-integrated polymer-nanofiller interface, indicating homogeneous dispersion of Tz@GO and the EXTEM® matrix. Mechanical testing confirmed that Tz@GO reinforcement significantly enhanced the mechanical properties of the membranes. A comprehensive investigation carried out into MMMs’ gas transport abilities revealed that Tz@GO incorporation effectively improved gas permeability. This enhancement is attributed to Tz@GO's ability to inhibit polymer chain entanglement, thereby increasing fractional free volume (FFV). The highest gas permeability was observed at a Tz@GO loading of 0.8 wt%. This study presents an innovative approach by maintaining the improved mechanical properties and CO2 separation performances of Tz@GO-incorporated EXTEM® membranes for CO2 capture application.