A kind of preparation method of molecular sieve membrane with high separation efficiency

Abstract

The invention relates to the technical field of molecular sieve membrane preparation, in particular to a preparation method of a molecular sieve membrane with high separation efficiency. The preparation method includes the steps: firstly, taking fresh black tea leaves as raw materials and fermenting the fresh black tea leaves to obtain tea fungus fermentation liquid; secondly, heating the tea fungus fermentation liquid under the action of sodium silicate and acid to obtain nano-silica; thirdly, adding aluminum nitrate into bacterial cellulose membrane and nano-silica mixture to obtain a molecular sieve membrane support; fourthly, proportionally mixing an alkali source, a silicon source, an aluminum source and deionized water, and stirring and aging the mixture to obtain molecular sieve membrane crystallization liquid; finally, mixing and heating the molecular sieve membrane support and the molecular sieve membrane crystallization liquid to obtain the molecular sieve membrane with the high separation efficiency. The nano-silica is combined on the surface of a bacterial cellulose membrane, the bacterial cellulose membrane is removed after reducing solution is sintered at high temperature to serve as the molecular sieve membrane support, the molecular sieve membrane has a nano-fiber network structure, so that the thickness of the molecular sieve membrane is reduced, the separationefficiency of the molecular sieve membrane is improved, and the molecular sieve membrane has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of molecular sieve membrane preparation, in particular to a preparation method of a molecular sieve membrane with high separation efficiency. Background technique [0002] Membrane separation is a separation technology developed in recent years, which uses one or more substances to pass through a semi-permeable barrier (membrane) faster than other substances to achieve the separation of feed mixtures containing two or more the goal of. Membrane separation technology mainly includes microporous filtration, ultrafiltration, reverse osmosis, nanofiltration, electrodialysis, gas separation and total evaporation. [0003] Molecular sieve is a microporous inorganic crystal material formed with silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron as the basic skeleton. It is a new type of inorganic membrane material developed in recent years that can realize molecular sieve. It has broad application prospec...

AI Technical Summary

Problems solved by technology

[0011] The main technical problem to be solved by the present invention is to provide a method for preparing molecular sieve membranes with high separation efficiency in view of the defect that the existing molecular sieves have a relatively large membrane thickness, resulting in unsatisfactory separation effects.

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