Preparation method for metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation

A metal-organic framework, ZIF-9 technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of insufficient dense film, shorten synthesis time, etc., and achieve the effect of good properties

Active Publication Date: 2015-11-11
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

The advantage of the seed crystal method is that the synthesis time is shortened, and the thickness of the film layer and the microstructure of th

Method used

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  • Preparation method for metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation
  • Preparation method for metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation
  • Preparation method for metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation

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Embodiment 1

[0020] A preparation method for ZIF-9 film, comprising the following steps:

[0021] 1. α-Al 2 o 3 Modification of the substrate: the porous α-Al 2 o 3 One side of the substrate was polished to smooth with 1500-mesh sandpaper, and ultrasonically cleaned with a large amount of deionized water until the deionized water was clear, so as to remove fine debris remaining on the surface of the substrate. Then the porous α-Al 2 o 3 Soaking the substrate in 25% sodium hydroxide solution for 24 hours can remove surface impurities on the one hand, and increase the concentration of hydroxyl groups on the other hand, which is beneficial to the growth of the MOF film. The treated substrate is treated with deionized water to be neutral: first, ultrasonically 10 times in a digitally controlled ultrasonic cleaner, each time for 8 minutes, with a power of 200W; then boil 3-4 times in boiling water until the measured pH is close to 7. Afterwards, the substrate was placed in a drying oven ...

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Abstract

A preparation method for a metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation belongs to the field of material synthesis. The preparation method comprises: firstly modifying a porous alpha-Al2O3 carrier by using 3-aminopropyl-trimethoxysilane, wherein the carrier and the ZIF-9 membrane can be better connected together; and secondly, putting the modified carrier in mother liquor for synthesizing the ZIF-9 membrane, firstly raising the reaction temperature to 80 DEG C at a certain rate and maintaining the temperature for a period of time, raising the reaction temperature to 130 DEG C at a certain rate and maintaining the temperature for a period of time, and finally reducing the reaction temperature to room temperature, wherein the ZIF-9 membrane is synthesized. The membrane has a continuous, uniform and compact structure and represents a good gas separation performance.

Description

technical field [0001] The invention belongs to the field of material synthesis, in particular to a metal organic compound for gas separation [0002] Preparation method of organoframework ZIF-9 membrane. Background technique [0003] Metal Organic Frameworks (MOFs) materials are mainly multidimensional periodic network frameworks formed by the connection of organic ligands containing oxygen or nitrogen elements and transition metal ions. At present, a large number of MOFs have been synthesized, some of which have high porosity, high specific surface area, good chemical stability and thermal stability. Due to the variable size of the framework and the corresponding chemical modification according to the target requirements, MOFs have a wider range of uses than other porous materials, such as separation, selective catalysis, gas storage, gas adsorption, photoelectric materials and magnetic materials, biochemical and pharmaceuticals, etc. [0004] Imidazole-based metal-orga...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00B01D69/02
Inventor 仲崇立黄玉垚刘大欢
Owner BEIJING UNIV OF CHEM TECH
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