Progress in preparation and application of water treatment membranes modified with imine based covalent organic frameworks

Abstract

Covalent organic frameworks(COFs) is a new type of porous material,which is composed of light elements with first and second periods,such as C,H,O,N and B, connected by reversible strong covalent bonds(C—C,C—O,C—Si,B—O),with adjustable pore size and various functional groups. In recent years,it has been used in the modified preparation of water treatment membrane materials. In this paper,the preparation and application of imine type COFs materials were briefly introduced,and the latest application progress of imine based COFs modified membranes in organic dye separation,seawater desalination,pervaporation,heavy metal ion removal, and organic solvent nanofiltration was emphatically introduced,and the mechanism of COFs materials in water treatment membranes was analyzed. It was concluded that the COFs modified water treatment membrane had not been widely studied in the field of water treatment due to high production cost,inappropriate pore size,and easy to be contaminated. The above problems would be the focus of future research.

Keywords

• imine based covalent organic frameworks
• membrane modification
• membrane separation