CO2 capture has been given much attention worldwide in order to minimize the CO2 emission in protecting the harmful impact on climate change. In this study, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles was embedded in polysulfone (PSf) polymer and the changes of the transport behavior of CO2 and CH4 single gases of the resultant membranes were investigated. The solubility of the gases through the membranes were determined by using dual-volume sorption cell at 5 bar and room temperature. Subsequently, the diffusion coefficients were determined from the permeability and solubility values. From the results obtained, the CO2 sorption values for both resultant membranes were higher than that of CH4. Meanwhile, the membrane incorporated with ZIF-8 demonstrated greater CO2 sorption capacity compared to pure PSf membrane. It can be concluded that the improvement of CO2 permeability after the incorporation of ZIF-8 into PSf is mainly due to the enhancement in solubility and diffusivity of the membrane. © Published under licence by IOP Publishing Ltd.