Construction and gas separation performance of MXene@PEI/IL composite membranes
Membrane separation technology has the advantages of green,high efficiency and environmental protection,and has become a research hotspot in the field of gas separation.In this study,MXene nanosheets were first combined with PEI,and then different loads of IL were spin coated on the upper surface of MXene@PEI membrane to form a high-performance MXene@PEI/IL composite membrane.The morphology,internal structure and thermal stability of MXene nanosheets and MXene@PEI/IL composite films were investigated by SEM,TEM,AFM,FTIR,XRD and TGA.The results showed that the positive charge of PEI and the negative charge of MXene enhance the film compatibility through electrostatic interaction.In addition,the effects of IL loading,temperature and operation time on the separation performance of MXene@PEI/IL composite membranes were systematically investigated.At 25 ℃ and 0.1 MPa,the maximum CO2 permeance of MXene@PEI/IL composite membrane for CO2/N2 separation was 481.78 GPU,and that for CO2/CH4 separation was 333.21 GPU.At the same time,MXene@PEI/IL composite membrane showed excellent selectivity for CO2/N2(35.30)and CO2/CH4(32.13).The membranes prepared in this study also show excellent durability and great potential for CO2 separation.
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