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Method for fast preparing TiO2/SiO2 composite aerogel through autocatalysis alcoholysis

A technology of composite aerogel and autocatalytic alcohol, applied in aerogel preparation, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of long production cycle, high cost, complicated preparation method, etc., and achieve reliable source , light weight, low cost effect

Inactive Publication Date: 2018-11-30
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for rapidly preparing TiO by autocatalytic alcoholysis 2 / SiO 2 Composite airgel method to solve the problems of complex preparation methods, long production cycle and high cost in the prior art

Method used

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  • Method for fast preparing TiO2/SiO2 composite aerogel through autocatalysis alcoholysis
  • Method for fast preparing TiO2/SiO2 composite aerogel through autocatalysis alcoholysis
  • Method for fast preparing TiO2/SiO2 composite aerogel through autocatalysis alcoholysis

Examples

Experimental program
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Effect test

Embodiment 1

[0015] TiO 2 / SiO 2 Composite airgel A: Take 20ml of absolute ethanol, add 5ml of TiCl dropwise to absolute ethanol under constant stirring 4 , and then continue to drop 5mlSiCl 4 , and then slowly drop 0.1mol / L ammonia water into this solution to obtain TiO 2 / SiO 2 Composite solution A. Put the solution in a water bath and stir in a water bath at 60°C to 80°C for 20 to 30 minutes, stop stirring, and let it stand at room temperature for 0.5 to 1 hour until it gels to obtain TiO 2 / SiO 2 Composite Gel A. The obtained gel A was placed in a water bath at 40°C-60°C, and the solvent was replaced with analytically pure absolute ethanol solution, and the absolute ethanol was replaced every 2-4h for 24h. Finally, supercritical drying is carried out to obtain TiO 2 / SiO 2 Composite airgel A.

Embodiment 2

[0017] TiO 2 / SiO 2 Composite airgel B: Take 24ml of absolute ethanol, add 4ml of TiCl dropwise to absolute ethanol under constant stirring 4 , and then continue to drop 8mlSiCl 4 , and then slowly drop 0.3mol / L ammonia water into this solution to obtain TiO 2 / SiO 2 Composite solution B. Put the solution in a water bath and stir in a water bath at 60°C to 80°C for 20 to 30 minutes, stop stirring, and let it stand at room temperature for 0.5 to 1 hour until it gels to obtain TiO 2 / SiO 2Composite Gel B. The obtained gel B was placed in a water bath at 40°C-60°C, and the solvent was replaced with analytically pure absolute ethanol solution, and the absolute ethanol was replaced every 2-4h for 24h. Finally, supercritical drying is carried out to obtain TiO 2 / SiO 2 Composite airgel B.

Embodiment 3

[0019] TiO 2 / SiO 2 Composite airgel C: take 40ml of absolute ethanol, add 10ml of TiCl dropwise to absolute ethanol under constant stirring 4 , and then continue to drop 5mlSiCl 4 , and then slowly drop 0.5mol / L ammonia water into this solution to obtain TiO 2 / SiO 2 Composite solution C. Put the solution in a water bath and stir in a water bath at 60°C to 80°C for 20 to 30 minutes, stop stirring, and let it stand at room temperature for 0.5 to 1 hour until it gels to obtain TiO 2 / SiO 2 Composite gel C. The obtained gel C was placed in a water bath at 40°C-60°C, and the solvent was replaced with analytically pure absolute ethanol solution, and the absolute ethanol was replaced every 2-4h for 24h. Finally, supercritical drying is carried out to obtain TiO 2 / SiO 2 Composite airgel C.

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PUM

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Abstract

The invention discloses a method for fast preparing TiO2 / SiO2 composite aerogel through autocatalysis alcoholysis. The method is characterized by comprising the following steps of (1) TiO2 / SiO2 composite sol preparation: taking absolute ethyl alcohol; dropwise adding titanium tetrachloride in a continuous stirring way to form a solution A; then, dropwise adding silicon tetrachloride into the solution A; finally, dropwise adding ammonia water with the concentration being 0.1 to 0.5 mol / L; performing hydrolysis at room temperature to prepare TiO2 / SiO2 composite sol; (2) TiO2 / SiO2 composite gel preparation: performing stirring for 20 to 30min in a water bath being 60 to 80 DEG C; performing still standing at room temperature for 0.5 to 1h until gelatination is realized; obtaining TiO2 / SiO2 composite gel; (3) TiO2 / SiO2 composite gel aging and solvent replacement: putting the TiO2 / SiO2 composite gel into a water bath pot being 40 to 60 DEG C; performing solvent replacement by an analytically pure absolute ethyl alcohol solution; changing the absolute ethyl alcohol once every 2 to 4h; performing replacement for 24h; (4) TiO2 / SiO2 composite gel drying: performing supercritical drying on the TiO2 / SiO2 composite gel subjected to solvent replacement by the absolute ethyl alcohol; obtaining the TiO2 / SiO2 composite aerogel.

Description

technical field [0001] The present invention relates to TiO 2 / SiO 2 The manufacture technology field of composite airgel material, especially relate to a kind of utilizing highly active SiCl 4 and TiCl 4 Rapid preparation of TiO by self-catalyzed alcoholysis as raw material 2 / SiO 2 Composite airgel method. Background technique [0002] With the development of science and technology, a single airgel material has gradually been unable to meet the needs of human beings. Through the functional compounding of two or more materials, more excellent materials can be obtained by compensating each other in performance, so compounding Airgel materials came into being. Single SiO 2 Aerogels have the advantages of high specific surface area, low density, high porosity, and low thermal conductivity. TiO 2 The material has the advantages of low melting point, strong magnetism, chemical corrosion resistance, and good photocatalysis. Composite TiO 2 / SiO 2 Airgel material is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 唐石云洪蓉唐安江郭俊江
Owner GUIZHOU INST OF TECH
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