Preparation method of polyvinyl alcohol/ZIF-8 porous composite material

A porous composite material, ZIF-8 technology, applied in the field of porous materials, can solve the problems of poor mechanical properties, difficult to collect, difficult to form, etc., and achieve the effect of good mechanical properties, simple preparation process, and large specific surface area

Inactive Publication Date: 2019-06-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZIF-8 is a powder material. During the application process, the mechanical properties are not good and it is difficult to collect. In order to solve this problem, ZIF-8 and polymers are usually prepared into composite materials.
[0003] At present, the composite material is obtained by uniformly dispersing ZIF-8 nanoparticles and polymer solution, coating and drying, but the composite material obtained by this method has many closed-pore structures, which will block the inherent properties of ZIF-8 particles. The pore structure reduces the specific surface area of ​​the composite material. At the same time, when the ZIF-8 loading is large, the composite material obtained by this method often has poor mechanical properties or even is difficult to shape, and it is difficult to disperse the ZIF-8 particles evenly.

Method used

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  • Preparation method of polyvinyl alcohol/ZIF-8 porous composite material
  • Preparation method of polyvinyl alcohol/ZIF-8 porous composite material
  • Preparation method of polyvinyl alcohol/ZIF-8 porous composite material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of polyvinyl alcohol / ZIF-8 porous composite material, comprising the following steps:

[0033] Step 1. Configuration of polyvinyl alcohol aqueous solution: Weigh 5g of 88 series polyvinyl alcohol solid particles into a beaker, add 95g of deionized water, seal the mouth of the beaker with plastic wrap, and place it for 12 hours to fully swell the polyvinyl alcohol; It is placed in a constant temperature magnetic stirring electric heating mantle, heated at 95°C for 2 hours, and stirred evenly to obtain a polyvinyl alcohol aqueous solution with a mass fraction of 5%;

[0034] Step 2. Preparation of ZIF-8 nanoparticles: Weigh 2.63g 2-methylimidazole and 1.75g ​​zinc nitrate, dissolve them in 200ml methanol respectively, mix and stir evenly, age for a period of time, and obtain ZIF through precipitation, washing and drying -8 nanoparticles;

[0035] Step 3, preparation of polyvinyl alcohol / ZIF-8 porous composite material: mix ZIF-8 nanoparticles and pol...

Embodiment 2

[0037] A preparation method of polyvinyl alcohol / ZIF-8 porous composite material, comprising the following steps:

[0038] Step 1. Configuration of polyvinyl alcohol aqueous solution: Weigh 5g of 99 series polyvinyl alcohol solid particles into a beaker, add 95g of deionized water, seal the mouth of the beaker with plastic wrap, and let it stand overnight to fully swell the polyvinyl alcohol; It is placed in a constant temperature magnetic stirring electric heating mantle, heated at 95°C for 2 hours, and stirred evenly to obtain a polyvinyl alcohol aqueous solution with a mass fraction of 5%;

[0039] Step 2. Preparation of ZIF-8 nanoparticles: Weigh 2.63g 2-methylimidazole and 1.75g ​​zinc nitrate, dissolve them in 200ml methanol respectively, mix and stir evenly, age for a period of time, and obtain ZIF through precipitation, washing and drying -8 nanoparticles;

[0040] Step 3, preparation of polyvinyl alcohol / ZIF-8 mixed dispersion: mix ZIF-8 nanoparticles and polyvinyl a...

Embodiment 3

[0042] A preparation method of polyvinyl alcohol / ZIF-8 porous composite material, comprising the following steps:

[0043] Step 1. Configuration of polyvinyl alcohol aqueous solution: Weigh 5g of 99 series polyvinyl alcohol solid particles into a beaker, add 95g of deionized water, seal the mouth of the beaker with plastic wrap, and let it stand overnight to fully swell the polyvinyl alcohol; It is placed in a constant temperature magnetic stirring electric heating mantle, heated at 95°C for 2 hours, and stirred evenly to obtain a polyvinyl alcohol aqueous solution with a mass fraction of 5%;

[0044] Step 2. Preparation of ZIF-8 nanoparticles: Weigh 2.63g 2-methylimidazole and 1.75g ​​zinc nitrate, dissolve them in 200ml methanol respectively, mix and stir evenly, age for a period of time, and obtain ZIF through precipitation, washing and drying -8 nanoparticles;

[0045] Step 3, preparation of polyvinyl alcohol / ZIF-8 porous composite material: mix ZIF-8 nanoparticles and po...

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Abstract

The invention relates to a preparation method of a polyvinyl alcohol/ZIF-8 porous composite material, and belongs to the field of porous materials. Polyvinyl alcohol is used as a polymer material andis compounded with ZIF-8, and the polyvinyl alcohol/ZIF-8 porous composite material is prepared by adopting an ice template method and a freeze-drying technology. The preparation process is simple andis short in time and the ZIF-8 is uniformly dispersed. In the polyvinyl alcohol/ZIF-8 porous composite material prepared by an ice template method, ZIF-8 particles are adhered to a polyvinyl alcoholporous material skeleton with a macroporous structure; as the polyvinyl alcohol porous material has an open pore structure, the inherent pore structure of ZIF-8 particles cannot be blocked, and therefore the porous composite material with the large specific surface area can be prepared. ZIF-8 nano-particles with different specific surface areas can be prepared by changing the preparation method ofthe ZIF-8 nano-particles; meanwhile, the specific surface area of the porous composite material can be controlled by changing the mass ratio of the ZIF-8 particles to the polyvinyl alcohol.

Description

technical field [0001] The invention relates to a preparation method of a polyvinyl alcohol / ZIF-8 porous composite material, which belongs to the field of porous materials. Background technique [0002] Zeolite imidazolium salt framework compound (ZIF-8) is a typical metal-organic framework compound (MOFs). ZIF-8 can be prepared through coordination between zinc ions and imidazole compounds. ZIF-8 has a simple preparation process and a high structural The structure also contains Langmuir sites for carbon dioxide adsorption, which can be applied to the adsorption and separation of organic solvents and carbon dioxide. However, ZIF-8 is a kind of powder material. During the application process, its mechanical properties are not good and it is difficult to collect. In order to solve this problem, ZIF-8 and polymers are usually prepared into composite materials. [0003] At present, the composite material is obtained by uniformly dispersing ZIF-8 nanoparticles and polymer soluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30
Inventor 柴春鹏杨煊赫侯婧辉姚艳青黄木华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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