A method for preparing a sandwich-structure zinc-containing metal-organic framework membrane supported by high-temperature-resistant zinc oxide nanorods

Abstract

The invention discloses a preparation method for a novel ZIFs membrane containing zinc adopting sandwich structure and supported by a high temperature resistant zinc oxide nanorod. According to the invention, by introducing a layer of zinc oxide nanorod on a porous carrier as a bridge to connect the carrier and the ZIFs membrane to construct to form the sandwich structural membrane supported by the zinc oxide nanorod. The zinc oxide nanorod has the following functions: 1, modifying the carrier surface to facilitate the uniform growth of the ZIFs membrane; 2, acting as homogeneous phase induction nucleation growing point of the continuous growth of the ZIFs membrane to guarantee the complete formation of the membrane with high sieving property; acting as bridging liking effect between the carrier and the membrane layer to solve the combination problem between the membrane and the carrier and guarantee high stability of the membrane. Compared with a traditional preparation method of a ZIFs membrane, the membrane prepared by the invention not only has high separating property, high temperature resistance, but also has simple process, good repeatability, convenience in amplification of large-scale preparation, and wide application prospect.

Description

technical field [0001] The invention provides a method for preparing a zinc-containing metal-organic framework membrane with a sandwich structure supported by high-temperature-resistant zinc oxide nanorods, which is applied to gas separation at high temperatures. The main purpose is to provide a high-performance metal-organic framework membrane with a new structure, and to solve the problem of the binding force between the membrane and the carrier. technical background [0002] Metal-organic framework (MOFs) materials are a very hot field of research in recent years. Due to their large specific surface area, good hydrothermal stability and some special chemical properties, they can be used in gas storage and separation, catalysts, drug slow release, sensors etc. Especially in today's society, energy and carbon emissions are increasingly becoming the focus of the whole society. MOFs will be an important material for human beings to solve the above problems, and their applica...

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Problems solved by technology

Preparation methods can be divided into three categories: (1) In situ growth method: [Aguado, et al., NewJ.Chem., 2011, 35:41-44.] directly put the carrier into the film-forming solution by hydrothermal or solvothermal It takes a certain period of time to obtain metal-organic framework membranes. Due to the difference in properties between metal-organic materials and the surface of the carrier, it is difficult to prepare dense metal-organic framework membranes by this method; (2) carrier surface modification method: using aminopropylsilane coupling agent [AishengHuang, et al. .,J.Am.Chem.Soc.,2010,132:15562-15564] Treat the carrier and connect the film layer by weak coordination. In this method, the force between the film layer and the carrier is relatively weak; (3) Secondary crystal seed Growth method: use viscous polymer materials (polyethyleneimine, PEI) to connect nano-scale metal-organic framework materials to the surface of the carrier to obtain a seed layer, and obtain a dense film layer through secondary growth in the synthetic solution. It is a typical preparation method in current reports, but it needs to prepare nano-scale seeds with uniform size first, and the synthesis process has many steps, which increases the preparation process.

At present, the preparation of metal-organic framework membranes is still immature, and the carriers used for the preparation of metal-organic framework membranes are mostly flakes.

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