氨基碳点/聚酰亚胺混合基质膜的制备及CO2分离性能研究

将水热合成法制备的氨基碳点与聚酰亚胺复合得到混合基质膜。通过SEM、FT-IR、XRD和DSC考查了氨基碳点掺杂质量分数对混合基质膜形貌和结构的影响。氨基碳点表面的氨基可以提供碱性环境,同时增加了膜内的自由体积,促进CO₂传递。当氨基碳点掺杂质量分数为0.3%时,混合基质膜的CO₂分离性能最佳,其CO₂、CH₄、N₂渗透通量分别为85.87 barrer、1.69 barrer、2.62 barrer,CO₂/CH₄、CO₂/N₂选择性分别为50.81和32.77。 

Study on preparation of amino-carbon dots/polyimide mixed-matrix membrane and its CO2 separation performance

Amino-carbon dots prepared by hydrothermal method are compounded with polyimide to obtain mixed-matrix membranes. The effects of doping concentration of amino-carbon dots on the morphology and structure of membranes are investigated by SEM, FT-IR, XRD and DSC. The amino groups on the surface of the amino-carbon dots could provide alkaline environment, which increases the free volume in the membranes and then promotes CO₂ transfer. When the doping concentration of amino-carbon dots is 0.3%, the CO₂ separation performance of mixed-matrix membranes is best. The permeability of CO₂, CH₄ and N₂ are 85.87 barrer, 1.69 barrer and 2.62 barrer, and the selectivity of CO₂/CH₄ and CO₂/N₂ are 50.81 and 32.77, respectively.