(628a) Amine-Functionalized Graphene Oxide Hollow Fiber Membranes for CO2 Capture

Membrane technology for CO₂ capture from flue gas exhibits the superior separation performance and attractive levelized cost of energy to achieve the post combustion capture goal set by the US Department of Energy (DOE), 90% capture of CO₂ with purity >95% with less than 35% increase in energy cost. Novel membrane materials with potential to greatly improve membrane performance and, such as 2-dimensional graphene and graphene oxide (GO), were extensively studied in fabricating ultrathin and chemical-resistant membranes. In this work, we developed a novel deposition method to prepare ultrathin GO-based hollow fiber membranes. Single layered graphene oxide (GO) sheets were uniformly deposited on the inner surface of polymeric hollow fibers with high quality. Furthermore, ethylenediamine (EDA) was selected as CO₂-philic agent and incorporated into the GO interlayer nanochannels by chemical grafting. To characterize GO and GO-EDA hollow fiber membranes, field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction analysis (XRD) were performed. Mixed gas (CO₂ in 15 vol.% and N₂ in 85 vol.%) separation was conducted for both membranes under wet condition. Results show superior CO₂ separation performance with CO₂ permeance of > 600 GPU and CO₂/N₂ selectivity of >500. This work, therefore, may provide a facile and scalable fabrication method of GO-based hollow fiber membranes for efficient CO₂ capture from flue gas.