Coaxial cable type graphene oxide-zeolite molecular sieve hollow fiber composite membrane and preparation method thereof

Abstract

The invention discloses a coaxial cable type graphene oxide-zeolite molecular sieve hollow fiber composite membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The composite membrane is composed of a graphene oxide coating layer, a zeolite molecular sieve separation layer, a modification layer and a hollow fiber base membrane which are coaxial and are sequentially arranged from outside to inside, and a powdery zeolite molecular sieve is limited between the graphene oxide coating layer and a modified support membrane, so that layered falling of the powdery zeolite molecular sieve in a membrane configuration is effectively avoided; the technical prejudice that a powder zeolite molecular sieve is difficult to form a membrane is broken through, the preparation method is simple in process and low in cost, the prepared composite membrane is uniform and complete in surface, and the composite membrane has the advantages of being large in filling density of a membrane separator in unit volume, suitable for high-pressure operation, large in gas flux, excellent in separation performance and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a coaxial cable type graphene oxide-zeolite molecular sieve@hollow fiber composite membrane and a preparation method thereof. Background technique [0002] Zeolite molecular sieves are widely considered as ideal gas separation materials due to their small pore size, good thermal and chemical stability, and good permeation and separation of small molecule gases. However, in order to obtain a film with a uniform and complete surface, no pinholes, and no defects, it is usually necessary to coat the zeolite molecular sieve seed crystals on a carrier with a small average pore size on the surface and grow them through multiple hydrothermal growths, which greatly improves the production efficiency. Membrane cost. At the same time, in order to obtain a complete zeolite molecular sieve membrane, it usually needs to undergo multiple growths, so the prepared membrane...

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Problems solved by technology

However, due to the weak interaction between the polymer matrix and the zeolite molecular sieve, gaps will inevitably form between the zeolite molecular sieve particles or between the zeolite molecular sieve and the continuous phase of the polymer matrix, which will further affect its separation efficiency.

So far, there are still huge challenges in the research and development of continuous homogeneous zeolite molecular sieve separation membranes with zeolite molecular sieve powder as the separation layer.

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