The invention discloses a preparation method and application of a
graphene oxide composite membrane, and belongs to the technical field of
gas separation membranes.The preparation method of the
graphene oxide composite membrane comprises the steps that an
aqueous dispersion liquid of
graphene oxide is prepared through a Hummer method, and
ultrasonic dispersion is conducted;
metal salt or oxysalt is added, and heating and mixing are conducted; the surface of a micro-
filtration membrane is covered with the prepared dispersion liquid through a vacuum
filtration method; the membrane is put into a
drying oven to be dried.The preparation method of the graphene
oxide composite membrane has the advantages that the preparation method is simple, the thickness of the obtained membrane is smaller than 10 nm, the space between graphene sheet
layers is adjustable, the obtained
composite membrane is used for
gas separation and has excellent comprehensive performance.Particularly, the graphene
oxide composite membrane prepared from
sodium tetraborate has high CO2
permeation flux and CO2 / CH4 and CO2 / N2 selectivity, and it is obtained through
mixed gas tests under the humidifying condition that the CO2
permeation flux can reach 650 GPU, CO2 / CH4 selectivity is 75, and CO2 / N2 selectivity is 58.