Method for preparing oriented MOF (Metal Organic Framework) film with assistance of steam and separation application

Abstract

The invention discloses a method for preparing an oriented MOF (Metal Organic Framework) film by a steam-assisted recrystallization method and separation application. In the process, the influence of factors including MOF powder particle loading capacity, formic acid content and synthesis time on orientation, surface compactness and roughness, thickness and hydrophilicity of the MOF thin film is explored, and meanwhile, the MOF thin film is applied to separation of ethanol / water, butanol / water and methanol / methyl tert-butyl ether. The oriented ultrathin MOF membrane is successfully prepared, has excellent separation performance and long-term stability, and becomes an efficient separation technology for replacing a high-energy-consumption separation means.

Description

technical field [0001] The invention belongs to the field of new materials and relates to membrane materials, in particular to a method for preparing an orientational MOF thin film by a steam-assisted recrystallization method and its separation application. Background technique [0002] Membrane separation is an emerging high-efficiency separation technology with a series of advantages such as large separation coefficient, moderate operating temperature, and low energy consumption. It is a new technology to solve major problems such as energy crisis, resource shortage, and environment faced by contemporary people. [0003] With the development of membrane technology, more and more membrane materials have been developed, including MFI-type molecular sieve membranes represented by mordenite, covalent organic framework (COFs) membranes, metal-organic frameworks (MOFs) membranes, etc. Among them, the preparation process of MFI molecular sieve membrane is complicated, the growth ...

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Problems solved by technology

In situ hydrothermal synthesis requires a large amount of reaction solution, and the prepared membrane is thick. At the same time, the orientation of the membrane is difficult to precisely control, and it is difficult to balance the barrier between the membrane flux and the separation factor in the application process.

The secondary growth method makes the preparation process of the membrane complicated, and the surface characteristics of the membrane are greatly affected by the assembly method of NU-906. At the same time, it is difficult to avoid the problem between the surface affinity of NU-906 and the carrier.

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