Preparation method of UiO-66 gel composite membrane and its application in H2 / CO2 separation

Abstract

The present invention discloses a preparation method of a UiO-66 gel composite membrane and its application in H2 / CO2 separation, belonging to the field of gas separation membrane materials. This method obtains a UiO-66 gel composite membrane by spin-coating a mixed solution of UiO-66 gel and polyethyleneimine to a flexible polymer substrate; it is then cross-linked to fix the network structure of UiO-66 gel and branched polyethyleneimine composition, ensure the mechanical strength of the membrane, weaken the force between UiO-66 gel and polyethyleneimine, and improve membrane flux. The preparation method of the present invention is simple, and branched polyethyleneimine can reinforce the UiO-66 gel network, making it more flexible to adapt to the polymer substrate; UiO-66 gel pores can also be modified, pore size is reduced, CO2 transfer rate is reduced, while CO2 has high adsorption capacity to prevent it from diffusing, so the prepared UiO-66 gel composite membrane has excellent H2 / CO2 separation performance.

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