PEI改性氧化石墨烯的制备及其CO2的吸附

摘要

以氧化石墨烯( GO)和聚乙烯亚胺( PEI)为原料,将PEI接枝到GO表面,制备了PEI改性的氧化石墨烯复合材料( GPs),讨论了GO/PEI的不同质量比对复合材料孔隙结构和CO2吸附性能的影响。通过全自动吸附仪对样品的孔隙结构进行了基本表征,并在不同条件下研究了GPs对CO2的吸附脱附性能。结果表明：当GO/PEI的比例为1：6时,比表面积达到最大值37 m2/g,总孔容为0．064 cm3/g,平均孔直径为69．1 nm, CO2吸附量在273 K、3 MPa下最高达到645 mg/g。%Polyethyleneimine modified graphene oxides ( GPs) were prepared by grafting polyethyleneimine ( PEI) on the surface of graphene oxides ( GO) . The effects of different mass ratios of GO/PEI on the pore structure of GPs and the adsorption properties of CO2 were discussed. The structure and surface properties of synthesized composites were characterized by full automatic adsorption instrument and its adsorption and desorption capability for CO2 was also conducted at different conditions. The results indicated that the prepared GPs exhibited high specific surface area (37 m2/g), total pore volume (0. 064 cm3/g) and average hole diameter (69. 1 nm) with a GO:PEI=1:6, and its exhibited the best CO2 adsorption value of 645 mg/g at 3 MPa and 273 K.