Preparation method and application of hierarchical porous molecular sieve membrane

Abstract

The invention relates to a preparation method and application of a hierarchical porous molecular sieve membrane. A mesoporous structure guiding agent is added to limit the growth of a molecular sieve crystal, and is subjected to self-assembly in a crystallization process of the molecular sieve crystal, so as to generate a mesoporous structure. The hierarchical porous molecular sieve membrane is synthesized by using a seed crystal inducing secondary nucleation mechanism and a hydrothermal one-step synthesis method; synthesis conditions are mild and controllable, the simplicity in preparation and good repeatability are realized, energy consumption is reduced, and the cost is reduced. The hierarchical porous molecular sieve membrane prepared by adopting the method shows good retention performance, and the retention molecular weight is controllable between 200 and 500000 Da. The method for preparing the hierarchical porous molecular sieve membrane, provided by the invention, can be used for synthesizing the hierarchical porous molecular sieve membrane with other micropore skeleton structures, and has high cost performance and a broad industrial production prospect; the application of the preparation method also can be popularized to the field of catalysis.

Description

technical field [0001] The invention belongs to the field of inorganic membrane preparation, and relates to a preparation method of a multi-stage pore molecular sieve film, in particular to a preparation method of a mesoporous multi-stage pore molecular sieve film and its application in water treatment. Background technique [0002] Membrane separation technology has become one of the important technologies to solve key problems such as energy, food, environment and water resources in the world because of its high efficiency, energy saving and environmental friendliness, and it has attracted more and more attention. According to the classification of membrane properties, membrane materials can be mainly divided into organic membranes, inorganic membranes and liquid membranes. [0003] At present, organic membranes are dominant in industrial ultrafiltration or nanofiltration membranes. The preparation process is simple and the cost is low, but the mechanical strength, anti-po...

AI Technical Summary

Problems solved by technology

[0005] At present, due to the small pore size (0.3 nm ~ 1 nm) and compactness of the molecular sieve membrane, the existing molecular sieve membrane only uses its own microporous structure for separation and purification, and water treatment is also limited to the reverse osmosis process. In 2004, Dong et al. For the first time, the MFI molecular sieve membrane was applied to the water-salt reverse osmosis separation system (J. Membr. Sci., 2004(243): 401-404.), the high operating pressure and extremely low flux limit the molecular sieve Development of Membranes in the Field of Water Treatment

Images