Amino polymer functionalized covalent organic framework membrane as well as preparation method and application thereof

• Main Authors: JIANG ZHONGYI, LIANG XU, HE GUANGWEI, ZENG SHICHEN, REN YANXIONG
• Format: Patent
• Language: Chinese; English
• Published: 13.02.2024
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses an amino polymer functionalized covalent organic framework membrane, the membrane comprises a covalent organic framework nanosheet membrane and a surface modified amino-containing functionalized polymer, the covalent organic framework nanosheet membrane is TpBD-(COOH) 2 with the membrane thickness of not more than 100 nm, the amino-containing functionalized polymer is PEI, and the covalent organic framework nanosheet membrane is TpBD-(COOH) 2 with the membrane thickness of not more than 100 nm. And the thickness of the modified polymer layer does not exceed 10nm. The membrane is prepared through a vacuum-assisted self-assembly method and a modification two-step method after a reaction, PEI rich in amino is grafted to the surface of TpBD-(COOH) 2, surface defects of the membrane are repaired, and a promoting transfer group is introduced. The membrane is used for a carbon dioxide and nitrogen separation system and has high flux and high selectivity on carbon dioxide, and the CO2/N2 separ