Preparation method of MOFs and polymer bicontinuous mixed matrix membrane

Abstract

The invention belongs to the technical field of gas membrane separation, and provides a preparation method of an MOFs and polymer bicontinuous mixed matrix membrane. The preparation method comprises the following steps: adding inorganic metal salt particles into an electrospinning polymer for electrostatic spinning, then calcining and converting into metal oxide fibers, then taking oxide nanofibers as a self-sacrifice template, growing MOFs in situ through'coordination-replication ', maintaining the balance between template dissolution and MOFs nucleation, and converting the metal oxide nanofiber mat into the MOFs nanofiber mat. Functional small molecules with low molecular weight are polymerized into gaps of the MOFs nanofibers in situ, so that the compact MOFs/PDA mixed matrix gas separation membrane with high air permeability is constructed. The MOFs/PDA can provide a low-resistance rapid transfer path, selective screening of gas molecules is realized, and the prepared gas separation membrane has the characteristics of high permeability, high selectivity and high mechanical strength, so that the application prospect of the membrane is wider.

Description

technical field [0001] The invention belongs to the technical field of gas membrane separation, and mainly designs a bicontinuous mixed matrix membrane of MOFs and polymers, constructs a long-distance continuous low-resistance channel for gas molecule transmission, and improves the gas permeability of the mixed matrix membrane. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology used in industrial production. Compared with traditional separation methods, it has the advantages of high efficiency and easy coupling. It requires relatively low operating energy during the separation process. It is a kind of A very competitive separation method has attracted much attention, and its core is to prepare a separation membrane material with high separation performance. [0003] Conventional polymer membrane materials have obvious "trade-off" phenomenon, and the permeability and selectivity cannot be balanced; while inorgan...

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Problems solved by technology

Aiming at the problems of poor selectivity and low mechanical properties of polyethylene glycol series photocurable polymer films, it is proposed to use nanofibers prepared by electrospinning as a skeleton, and the fibers are used as a skeleton in the film to construct a "reinforced cement" structure. The in-situ polymerization of nanofibers and polymers has a good bonding force, which greatly improves the mechanical properties of the film, but because it belongs to a pure polymer film, the air permeability of the film is low

Professor Zhang Xiuling of Beijing University of Science and Technology and others invented a method for the preparation of metal-salt-assisted rapid growth of metal-organic framework derivatives (CN202110228812.1). In this method, metal salts and high molecular polymers are first added to organic solvents, and electrospinning is used to The technology obtains the metal salt / polymer nanofiber membrane, and then uniformly coats the organic ligand solution containing the metal-organic framework MOFs growth on the metal salt / polymer nanofiber membrane, and then realizes the metal in the nanofiber through hot pressing technology. The chemical bonds between ions and ligands make MOFs grow uniformly on the nanofiber membrane, but the high loading of MOFs cannot be guaranteed

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