Preparation method of silicon oxide aerogel with grade gradient holes for efficient water evaporation

A silicon oxide airgel and water evaporation technology, applied in the field of nanomaterials, achieves low cost, excellent light and hot water evaporation performance, and meets the needs of water management

Active Publication Date: 2022-03-25
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that the existing evaporators used for solar-driven interface water evaporation are difficult to meet the requirements of effective heat management and water management at the same time, and provides a low-cost, easy-to-operate, scalable silicon oxide gas condensation with graded gradient holes Glue preparation method; compared with wood and sponge porous materials, the silicon oxide airgel with graded gradient pores synthesized by the method disclosed in the present invention can effectively balance the heat management and water management in the process of light and hot water evaporation, and significantly improve the light-to-heat conversion efficiency

Method used

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  • Preparation method of silicon oxide aerogel with grade gradient holes for efficient water evaporation
  • Preparation method of silicon oxide aerogel with grade gradient holes for efficient water evaporation
  • Preparation method of silicon oxide aerogel with grade gradient holes for efficient water evaporation

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preparation example Construction

[0029] A method for preparing silica airgel with graded gradient pores for efficient water evaporation, the following steps are used:

[0030] Step 1 Mix 2-5mol / L urea solution with 0.22-0.44mol / L cetyltrimethylammonium bromide solution evenly, and then add glacial acetic acid to make the pH of the solution reach 4.2-4.3 , to obtain a mixed solution A; the mixed solution A is heated and stirred for 2 to 4 hours until completely transparent, wherein the mass ratio of urea to cetyltrimethylammonium bromide is 3:4 to 15:4;

[0031] Step 2 Add tetraethyl orthosilicate to the mixed solution A obtained in step 1, and keep stirring for 20 to 40 minutes until it becomes translucent to obtain a mixed solution B, wherein the mass ratio of urea to orthosilicate is 6: 23.4~15:14;

[0032] Step 3: Pour the mixed solution B obtained in step 2 into a high-temperature-resistant plastic container and seal it tightly, and place the plastic container in an oven at 60-80°C for gelation for 20-30...

Embodiment 1

[0036] A method for preparing silica airgel with graded gradient pores for efficient water evaporation, the following steps are used:

[0037] Step 1 gets the urea of ​​3mol / L and the cetyltrimethylammonium bromide solution of 0.3mol / L and mixes, and then adds glacial acetic acid wherein and makes the pH value of solution be adjusted to 4.25, obtains mixed solution A; The mixed solution A was heated and stirred for 3h until completely transparent;

[0038] In step 2, add 22.8mL tetraethyl orthosilicate to the mixed solution A obtained in step 1, and continue to stir for 30 minutes until it becomes translucent to obtain mixed solution B;

[0039] Step 3: Pour the mixed solution B obtained in step 2 into a high-temperature-resistant plastic container and seal it tightly, and place the plastic container in an oven at 60°C for gelation for 24 hours;

[0040] Step 4 Pour 20ml of absolute ethanol into the container after step 3, and seal it tightly. After soaking at room temperatur...

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Abstract

The invention discloses a preparation method of silicon oxide aerogel with grade gradient pores for efficient water evaporation. The silicon oxide aerogel with the grade gradient pores is obtained through the steps of preparing a urea-hexadecyl trimethyl ammonium bromide solution with a specific pH value, adding tetraethoxysilane, gelatinizing and the like. The preparation method of the silicon oxide aerogel with the grade gradient holes for efficient water evaporation has the advantages of low cost, easiness in operation and capability of being amplified; compared with wood and sponge porous materials, the silicon oxide aerogel with grade gradient pores synthesized by the method disclosed by the invention can effectively balance thermal management and water management in a photo-thermal water evaporation process, and the photo-thermal conversion efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing silicon oxide airgel with graded gradient pores for high-efficiency water evaporation. Background technique [0002] Solar-driven interfacial water evaporation technology is considered to be one of the most potential technologies to solve the problem of water scarcity due to its advantages such as environmental friendliness, low cost, no need for electricity and complicated equipment. Effective heat management and water management are two important aspects that determine the efficiency of light-to-heat conversion. Evaporators with porous structures are favorable for light trapping and fast transport of water and vapor, and have received extensive attention. [0003] Natural wood and synthetic sponges are often used as carriers of photothermal materials. Their porous structure makes them have fast water transport properties, but thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158B01J13/00C02F1/04
CPCC01B33/1585B01J13/0091C02F1/04C01P2004/03C01P2002/82C01P2006/17C01P2006/32
Inventor 常青张暄周凌云胡胜亮李宁薛超瑞郝彩红杨金龙
Owner ZHONGBEI UNIV
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