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Preparation method of ZnO/cellulose composite aerogel

A composite airgel and cellulose technology, which is applied in the production of bulk chemicals, can solve the problems of metal oxide powders such as easy agglomeration, difficulty in recycling, secondary pollution and catalytic efficiency, and achieve uniform size, uniform distribution, and easy solution. The effect of reunion

Active Publication Date: 2017-05-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention utilizes the ionic liquid dissolving method to prepare cellulose aerogel, and uses this porous material as a carrier to synthesize ZnO spherical nanoparticles with uniform distribution and uniform size in situ, which solves the problem that metal oxide powders are easy to agglomerate, difficult to Recycling, easy to cause secondary pollution and low catalytic efficiency

Method used

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  • Preparation method of ZnO/cellulose composite aerogel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The method for preparing ZnO / cellulose composite airgel in this embodiment is carried out according to the following steps:

[0019] (1) Mix and stir the ionic liquid and ethyl acetate, pour it into a separatory funnel and let it stand for 10 minutes, then remove the ionic liquid; repeat 3 times, pour the ionic liquid into a round-bottomed flask, spin evaporate at 55°C for 3 hours, and put it into vacuum drying Oven is dried at 80°C for 3-5 days, and phosphorus pentoxide is replaced regularly until the moisture content in the ionic liquid is lower than 1%. Prime and ionic liquid mass ratio) microcrystalline cellulose after vacuum drying, magnetic stirring 1h until the solution is clear and transparent;

[0020] (2) Pour the solution into the mold, put it in a vacuum drying oven for degassing for 30 minutes, and then cool to room temperature; seal the mold with plastic wrap and pierce a small hole with a needle tube, and leave it for 12 hours to form a rege...

Embodiment 2

[0022] Embodiment 2: The method for preparing ZnO / cellulose composite airgel in this embodiment is carried out according to the following steps:

[0023] (1) Mix and stir the ionic liquid and ethyl acetate, pour it into a separatory funnel and let it stand for 10 minutes, then remove the ionic liquid; repeat 3 times, pour the ionic liquid into a round-bottomed flask, spin evaporate at 55°C for 3 hours, and put it into vacuum drying Oven is dried at 80°C for 3-5 days, and phosphorus pentoxide is replaced regularly until the moisture content in the ionic liquid is lower than 1%. Cellulose and ionic liquid mass ratio) microcrystalline cellulose after vacuum drying, magnetic stirring 1h until the solution is clear and transparent;

[0024] (2) Pour the solution into the mold, put it in a vacuum drying oven for degassing for 30 minutes, and then cool to room temperature; seal the mold with plastic wrap and pierce a small hole with a needle tube, and leave it for 12 hours to form a ...

Embodiment 3

[0026] Embodiment 3: The method for preparing ZnO / cellulose composite airgel in this embodiment is carried out according to the following steps:

[0027] (1) Mix and stir the ionic liquid and ethyl acetate, mix and stir the ionic liquid and ethyl acetate, pour it into a separatory funnel and let it stand for 10 minutes, then remove the ionic liquid; repeat 3 times, pour the ionic liquid into a round bottom flask at 55°C Rotary steam for 3 hours, put in a vacuum drying oven at 80°C and dry for 3-5 days, replace phosphorus pentoxide regularly until the moisture content in the ionic liquid is less than 1% before it can be used in the experiment; heat the ionic liquid water bath to 70°C , add 1wt% (mass ratio of microcrystalline cellulose to ionic liquid) vacuum-dried microcrystalline cellulose, and stir magnetically for 1 hour until the solution is clear and transparent;

[0028] (2) Pour the solution into the mold, put it in a vacuum drying oven for degassing for 30 minutes, and...

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Abstract

The invention discloses a preparation method of zinc oxide (ZnO) / cellulose composite aerogel. The preparation method is mainly characterized in that an acid or an alkali are not used in a preparation process, and ZnO nano particles are synthesized in situ on regenerated cellulose. The preparation method comprises the following main processes of first, dissolving cellulose in ionic liquid, regenerating the cellulose to be hydrogel through a regenerating agent, and carrying out freeze drying to subsequently obtain aerogel; soaking the aerogel in a zinc acetate solution, and synthesizing the ZnO nano particles in situ by utilizing diglycol. In a preparation technique provided by the invention, the use of highly corrosive liquid is avoided; the cellulose is dissolved by using the ionic liquid for replacing acid / alkali and ZnO is synthesized by using the diglycol for replacing NaOH; the used ionic liquid can be recovered and recycled; the green preparation technology can be realized. The prepared ZnO / cellulose composite aerogel is degradable, and is good in stability, high in specific surface area, homogeneous in structure and uniform in the distribution of ZnO particles; the problems that the ZnO particles easily agglomerate, are difficultly recovered and easily cause secondary pollution, and the like, are solved; the ZnO / cellulose composite aerogel can be used in the fields of solar cells, sensors, catalysis and the like.

Description

technical field [0001] The invention relates to a preparation method of ZnO / cellulose composite airgel, in particular to a preparation method of in-situ synthesis of zinc oxide nanoparticles on regenerated cellulose airgel. Background technique [0002] Airgel is a new type of lightweight nanoporous amorphous solid material, and it is one of the lightest solid materials in the world. Its porosity rate is as high as 80-99.8%, the size of the pores is generally 1-100nm, and its specific surface area is as high as 200-1000m 2 / g, and the density range can be up to 3-500kg / m 3 , is a new type of porous material with many special properties and broad application prospects. Airgel is a porous material obtained by removing the internal solvent while keeping the three-dimensional network structure of hydrogel or organic gel unchanged. Airgel has a series of excellent properties such as low density, high porosity, high specific surface area, and low thermal conductivity. Supercap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/28C08L1/02C08K3/22
CPCC08J9/28C08J9/40C08J2205/026C08J2301/02C08K3/22C08K2003/2296C08K2201/011C08L1/02Y02P20/54
Inventor 吕兴梅李晓前张杰张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI