Polyimide-zinc organic framework loaded graphene oxide hybrid membrane as well as preparation and application

Abstract

The invention discloses a polyimide-zinc organic framework loaded graphene oxide hybrid membrane. A preparation process comprises the following steps: preparing graphene oxide by adopting a Hummer method, preparing dispersing liquid with a mass ratio of methanol to water of (1 to 4) to 1, and performing ultrasonic dispersion; adding the graphene oxide and the dispersing liquid into a mixed solution of zinc nitrate hexahydrate and 2-methylimidazole, and performing a stirring reaction at room temperature, thus preparing a zinc organic framework loaded graphene oxide compound nanosheet; and blending the zinc organic framework loaded graphene oxide compound nanosheet and a polyimide solution to prepare a membrane casting solution, and preparing the hybrid membrane through a tape casting method. The polyimide-zinc organic framework loaded graphene oxide hybrid membrane disclosed by the invention has the advantages that the raw materials of the hybrid membrane are easy to obtain, and the preparation process is simple and controllable; and the prepared compound membrane is used for gas separation, and has excellent separation performance. Particularly, under a humidification condition, the permeability of CO2 pure gas is 238 barrer, and the CO2 / N2 selectivity is 65.

Description

technical field [0001] The invention relates to a polyimide-zinc organic framework loaded graphene oxide hybrid membrane and its preparation and application, belonging to the technical field of gas membrane separation. Background technique [0002] CO 2 As a major greenhouse gas, its emission reduction has received extensive attention from all over the world. CO 2 Excessive emissions will bring serious negative effects on the environment and climate of our country and the world, so CO 2 The capture and recycling of waste is imminent. The gas membrane separation method has the advantages of low energy consumption, no phase change, easy operation, simple and portable equipment, easy scale-up production and high operational reliability. At present, due to the low separation performance of membrane materials, its further development is limited. Traditional polymer materials have good film-forming properties and low cost, and are the main body of film materials. However, tr...

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Problems solved by technology

So far, the preparation and application of polyimide-zinc organic framework-supported graphene oxide hybrid membranes have not been reported in the literature.