Improved co2/ch4 separation properties of cellulose triacetate mixed–matrix membranes with ceo2@go hybrid fillers

Abstract

The study of the effects associated with the compatibility of the components of the hybrid filler with polymer matrix, which ultimately decide on achieving mixed matrix membranes (MMMs) with better gas separation properties, is essential. Herein, a facile solution casting process of simple incorporating CeO2@GO hybrid inorganic filler material is implemented. Significant improvements in material and physico-chemical properties of the synthesized membranes were observed by SEM, XRD, TGA, and stress-strain meas-urements. Usage of graphene oxide (GO) with polar groups on the surface enabled form-ing bonds with ceria (CeO2) nanoparticles and CTA polymer and provided the homogeneous dispersion of the nanofillers in the hybrid MMMs. Moreover, increasing GO load-ing concentration enhanced both gas permeation in MMMs and CO2 gas uptakes. The best performance was achieved by the membrane containing 7 wt.% of GO with CO2 permeability of 10.14 Barrer and CO2/CH4 selectivity 50.7. This increase in selectivity is almost fifteen folds higher than the CTA-CeO2 membrane sample, suggesting the detrimental effect of GO for enhancing the selectivity property of the MMMs. Hence, a favorable syn-ergistic effect of CeO2@GO hybrid fillers on gas separation performance is observed, pro-pounding the efficient and feasible strategy of using hybrid fillers in the membrane for the potential biogas upgrading process.