Chitosan-crown ether polyimide modified cellulose membrane as well as preparation method and application thereof

The invention provides a chitosan-crown ether polyimide modified cellulose membrane as well as a preparation method and application thereof, and belongs to the technical field of lithium ion selective adsorption. According to the method, the modified cellulose membrane with different crown ether polyimide loading capacities and high specific surface area can be rapidly and controllably prepared by utilizing a surface spin coating and in-situ immobilization technology. In addition, as crown ether polyimide has the characteristic of selectively adsorbing metal ions, the crown ether polyimide and chitosan are blended and spin-coated on the surface of the cellulose membrane, and a high-performance lithium ion adsorption membrane material can be obtained. Different from a traditional method for preparing a spherical or polymer adsorption material by using crown ether, in the modified cellulose membrane prepared by the method, the crown ether can be exposed on the surface of the cellulose membrane, so that the prob