Modified porous membrane material and preparation method thereof, and liquid membrane separation method of carbon dioxide

A method of using a modified porous membrane material in improving a separation factor during a liquid membrane separation of carbon dioxide (CO2), wherein the modified porous membrane material is prepared by a preparation method comprising the following steps:

• dissolving a silane coupling agent containing an amine group in an organic solvent to serve as a modifier;
• immersing an inorganic porous membrane material in the modifier for a grafting reaction;
• and after the grafting reaction is completed, performing washing and drying to obtain the modified porous membrane material, wherein the inorganic porous membrane material has an average pore size of 20 nm-200 nm, and
• the liquid membrane separation of the CO2 comprises the following steps:
• loading water as a solvent into pore channels of the modified porous membrane material to form a liquid membrane;
• and allowing the liquid membrane to contact with a gas mixture containing the CO2 to make the CO2 permeate the liquid membrane.