石墨烯基气体分离膜的研究化学工程与技术专业论文.docxVIP

石墨烯基气体分离膜的研究Graphene-based 石墨烯基气体分离膜的研究 Graphene-based Membrane for Gas Separation Abstract Membrane separation was considered an emerging technology for gas separation due to the advantages of low energy consumption，less investment and simple equipment．However， gas separation membrane still faces the challenges of low mechanical strength，low permeation flux and low selectivity．And one effieient solution to overcome these challenges is to develop new membrane materials with high permeability，high selectivity，high thermal stability and chemical resistance．As a novel two-dimensional nano-carbon material with only single atom thickness，graphene is considered to be the ideal membrane material due to its excellent flexibility，high mechanical strength and chemical stability．Assembled graphene membrane composed by stacked graphene nano sheets has promising potential for gas separation application． In this thesis，graphene oxide(GO)was prepared through modified Hummers method with natural graphite with different particle sizes as raw material．The structure and surface properties of GO were characterized by FT—IR，XRD，UV-Vis，TEM and AFM technologies． Assembled graphene membrane were prepared using GO with different size distribution as precursor．First，GO composite membrane with microporous membrane filter as support has been prepared via vacuum filtration．And the effect of preparation conditions and the type of support on morpho logy and gas separation performance of GO composite membrane was investigated．Secondly．free—standing PAA／GO hybrid membrane was fabricated via solvent evaporation method with polyamic acids(PAAs)as addition component．And after carbonization，a flexible graphene carbon membrane was then obtained．The effect of raw materials and preparation conditions on gas separation performance was investigated．The structure and morphology of graphene carbon membrane was characterized by XRD and SEM technologies．The resuks show that： 1．GO of single-atom thickness we