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Cellulose nanofiber aerogel photo-thermal interface water evaporation material and preparation method thereof

A technology of nanofiber and cellulose, which is applied in the field of photothermal water evaporation materials and its preparation, can solve the problems of poor water resistance, achieve low thermal conductivity, light weight, and improve the effect of photothermal conversion efficiency

Active Publication Date: 2022-04-29
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a cellulose nanofiber airgel light-thermal interface water evaporation material and its preparation method, which uses polyvinyl alcohol for filling reinforcement and chemical crosslinking The method improves the mechanical strength of cellulose nanofiber airgel, overcomes the problem of poor water resistance of cellulose nanofiber airgel, and enhances the durability and stability of solar evaporation materials

Method used

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  • Cellulose nanofiber aerogel photo-thermal interface water evaporation material and preparation method thereof
  • Cellulose nanofiber aerogel photo-thermal interface water evaporation material and preparation method thereof
  • Cellulose nanofiber aerogel photo-thermal interface water evaporation material and preparation method thereof

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Embodiment 1

[0026] Embodiments of the present invention provide a cellulose nanofiber airgel photothermal interface water evaporation material and a preparation method thereof, the method comprising the following steps:

[0027] Step 1) Prepare 40 g of cellulose nanofiber dispersion with a mass fraction of 6%, put it in a beaker and stir at room temperature.

[0028] Step 2) preparation concentration is the graphene oxide solution of 1mg / mL, gets 40g graphene oxide solution, joins 0.72g polyvinyl alcohol in the graphene oxide solution and heats, after polyvinyl alcohol dissolves completely, pour into step (1 ) in the beaker, then add 0.72g butane tetracarboxylic acid and 0.72g sodium hypophosphite, and stir for 4-5 hours.

[0029] Step 3) Pour the uniformly dispersed mixture into a cylindrical mold with a diameter of 2.5cm and a height of 5cm, and place it in a refrigerator at -80±5°C for 10-12h, then put it in a temperature of -60±5°C , and freeze-dry in a freeze dryer with a vacuum deg...

Embodiment 2

[0032] Step 1) Prepare 40 g of cellulose nanofiber dispersion with a mass fraction of 6%, put it in a beaker and stir at room temperature.

[0033] Step 2) preparing a graphene oxide solution with a concentration of 2 mg / mL, taking 40 g of the graphene oxide solution, adding 0.72 g of polyvinyl alcohol to the graphene oxide solution for heating, after the polyvinyl alcohol is completely dissolved, pour into the step ( 1) into the beaker, then add 0.72g butane tetracarboxylic acid and 0.72g sodium hypophosphite, and stir for 4-5 hours.

[0034] Step 3) Pour the uniformly dispersed mixture into a cylindrical mold with a diameter of 2.5cm and a height of 5cm, and place it in a refrigerator at -80±5°C for 10-12 hours, then put it in a temperature of -60±5°C , and freeze-dry in a freeze dryer with a vacuum degree between 5-10Pa for 4-5 days to prepare the aerogel.

[0035] Step 4) Carry out the cross-linking reaction of the prepared airgel in an oven at 170±5°C for 10-15 minutes, ...

Embodiment 3

[0037] Step 1) Prepare 40 g of cellulose nanofiber dispersion with a mass fraction of 6%, put it in a beaker and stir at room temperature.

[0038] Step 2) preparation concentration is the graphene oxide solution of 3mg / mL, gets 40g graphene oxide solution, joins 0.72g polyvinyl alcohol in the graphene oxide solution and heats, after polyvinyl alcohol dissolves completely, pour into step (1 ) in the beaker, then add 0.72g butane tetracarboxylic acid and 0.72g sodium hypophosphite, and stir for 4-5 hours.

[0039] Step 3) Pour the uniformly dispersed mixture into a cylindrical mold with a diameter of 2.5cm and a height of 5cm, and place it in a refrigerator at -80±5°C for 10-12 hours, then put it in a temperature of -60±5°C , and freeze-dry in a freeze dryer with a vacuum degree between 5-10Pa for 4-5 days to prepare the aerogel.

[0040] Step 4) Carry out the cross-linking reaction of the prepared airgel in an oven at 170±5°C for 10-15 minutes, and then place the cross-linked...

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Abstract

The invention relates to a cellulose nanofiber aerogel photo-thermal interface water evaporation material and a preparation method thereof. Wherein the cellulose nanofibers and the polyvinyl alcohol serve as main body parts of the aerogel, the reduced graphene oxide serves as a photo-thermal conversion material, the butanetetracarboxylic acid (BTCA) serves as a cross-linking agent, and the sodium hypophosphite (SHP) serves as a catalyst. The preparation method comprises the following steps: pouring a certain amount of dispersion liquid containing cellulose nanofibers, polyvinyl alcohol, graphene oxide, a cross-linking agent and a catalyst into a mold for freezing, then performing freeze drying to obtain aerogel, performing cross-linking on the aerogel at a high temperature, and then performing reduction to obtain the cellulose nanofibers. The chemical crosslinking type cellulose nanofiber / polyvinyl alcohol / reduced graphene oxide aerogel photo-thermal interface water evaporation material is prepared. The preparation process of the method is low in cost, and the prepared aerogel has the advantages of being high in mechanical strength, high in water resistance stability, low in density, capable of self-floating, low in heat conductivity, high in photo-thermal performance, environmentally friendly, safe and the like.

Description

technical field [0001] The invention belongs to the field of photothermal water evaporation materials and preparation thereof, in particular to a cellulose nanofiber airgel photothermal interface water evaporation material and a preparation method thereof. Background technique [0002] Although the total amount of water resources in the world is large, there are very few fresh water resources for the survival and development of human society, and serious water pollution has brought serious challenges to the development of our country. Desalination of seawater is an effective way to obtain fresh water resources. The traditional seawater desalination field requires complex and expensive equipment and consumes a lot of energy during the work process. Therefore, the effective use of clean and safe energy will be the top priority of future development. Solar energy is a clean and renewable energy, inexhaustible, environmentally friendly, cost-effective energy resources. Using s...

Claims

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Application Information

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IPC IPC(8): B01J13/00C02F1/04C02F1/14
CPCB01J13/0091C02F1/14C02F1/043Y02A20/212
Inventor 李晓锋贾钰博李伟于中振
Owner BEIJING UNIV OF CHEM TECH
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