▎ 摘　　要

A novel fixed carrier composite membrane was prepared via interfacial polymerization by using graphene oxide nanosheets (GO), hyperbranched polyethylenimine (HPEI), and trimesoyl chloride (TMC) coating on a polysulfone membrane. The interfacial polymerization was confirmed with SEM, TEM,. ATR-FTIR, XPS, I)SC; and water contact angle. Further gas separation tests with CO2/N-2 (10:90 v:v) mixed gas confirmed that the addition of GO could significantly improve the CO2 permeance and CO2/N-2 selectivity. The highest CO2 permeance in this work was 9.7 GPU, while the selectivity was over 80. A further gas separation test under different feed gas humidity confirmed the facilitated transport was the main mechanism of gas separation through the membrane, while the addition of GO into the membrane exhibited a synergistic effect with the gas carriers: the surface defects acted as molecule sieves, and the interlayer fixed flow channels ensured a high water content microenvironment to improve the reactivity between CO2 and amino based carriers. Besides, superior stability of the composite membrane was also testified.