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Preparation method of block La2O3-SiO2 composite aerogel

A composite aerogel, la2o3-sio2 technology, applied in chemical instruments and methods, rare earth metal compounds, rare earth metal oxides/hydroxides, etc. And other issues

Inactive Publication Date: 2016-12-07
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The oxides of rare earth elements have the characteristics of high thermal stability, strong adsorption of heavy metal ions, and high catalytic performance, but it is difficult to form rare earth oxide aerogels and block them

Method used

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  • Preparation method of block La2O3-SiO2 composite aerogel

Examples

Experimental program
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Effect test

example 1

[0027] Mix tetraethyl orthosilicate, hydrochloric acid, deionized water, and absolute ethanol in a molar ratio of 1:0.1:6:16 at 45°C and stir for 60 minutes to obtain transparent SiO 2 Sol solution. to SiO 2 Add lanthanum chloride hydrate into the sol solution, and continue mixing and stirring at 50°C for 30 minutes until the mixed solution is colorless and transparent, and tetraethyl orthosilicate and lanthanum chloride hydrate are configured at a molar ratio of 1:0.3. Ammonia water was then added to the transparent solution to adjust the pH of the mixed solution to 6.5, and the mixture was stirred evenly at 50° C. for 30 minutes to obtain a colorless transparent solution. will get La 2 o 3 -SiO 2 The composite sol solution was poured into the mold and placed in an oven at 50°C for 3 hours to obtain a colorless and transparent La 2 o 3 -SiO 2 Composite wet gel. Then add ethanol aging solution to the sample in the mold for aging treatment, solvent replacement 3 times, ...

example 2

[0029] Mix tetraethyl orthosilicate, nitric acid, deionized water, and absolute ethanol in a molar ratio of 1:0.02:2:5 at 50°C and stir for 30 minutes to obtain transparent SiO 2 Sol solution. to SiO 2 Add lanthanum chloride hydrate into the sol solution, and continue mixing and stirring at 50°C for 60 minutes until the mixed solution is colorless and transparent, and the molar ratio of tetraethyl orthosilicate and lanthanum chloride hydrate is 1:0.1. Ammonia water was then added to the transparent solution to adjust the pH of the mixed solution to 7.5, and uniform stirring was continued at 50° C. for 30 min to obtain a colorless transparent solution. will get La 2 o 3 -SiO 2 The composite sol solution was poured into the mold and placed in an oven at 40°C for 5 hours to obtain a colorless and transparent La 2 o 3 -SiO 2 Composite wet gel. Then add acetone aging solution to the sample in the mold for aging treatment, solvent replacement 5 times, each 12h, finally get c...

example 3

[0031] Mix tetraethyl orthosilicate, acetic acid, deionized water, and absolute ethanol at a molar ratio of 1:0.2:10:20 at 50°C and stir for 50 minutes to obtain transparent SiO 2 Sol solution. to SiO 2 Add hydrated lanthanum sulfate to the sol solution, and continue mixing and stirring at 50°C for 45 minutes until the mixed solution is colorless and transparent, and the molar ratio of tetraethyl orthosilicate and hydrated lanthanum chloride is 1:0.5. Ammonia water was then added to the transparent solution to adjust the pH of the mixed solution to 5, and the mixture was stirred evenly at 50° C. for 30 minutes to obtain a colorless transparent solution. will get La 2 o 3 -SiO 2 Pour the composite sol solution into the mold and place it in a 60°C oven for 1 hour to react at a constant temperature to obtain a colorless and transparent La 2 o 3 -SiO 2 Composite wet gel. Then add ethanol aging solution to the sample in the mold for aging treatment, solvent replacement 4 ti...

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Abstract

The invention relates to a preparation method of block La2O3-SiO2 composite aerogel. The preparation method comprises the following steps of uniformly stirring tetraethyl orthosilicate, hydrated inorganic lanthanum salt, an acidic catalyst, deionized water and anhydrous ethanol according to a certain mole ratio, and regulating the pH value of a reaction with an ammonia solution so as to obtain a colorless clarificated La2O3-SiO2 composite sol solution; then leaving the colorless clarificated La2O3-SiO2 composite sol solution to stand under environment with certain temperature for gel coagulation; and finally, performing drying treatment on samples by a CO2 super critical drying method so as to obtain the block La2O3-SiO2 composite aerogel. A preparation technology is simple in process and easy to operate; the prepared La2O3-SiO2 composite aerogel has a uniform nanopore structure, and has the advantages of being high in specific surface area, low in heat conductivity, low in density and the like, and the service temperature of pure SiO2 aerogel is greatly increased. The La2O3-SiO2 composite aerogel not only having a nanoporous aerogel structure but also having the characteristics of rare-earth element oxide can have good application prospects in the respects of high-temperature insulation, heavy metal ion adsorption, catalysts and catalyst carriers.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanomaterials with high specific surface area and high-efficiency adsorption characteristics, and relates to a block La 2 o 3 -SiO 2 The preparation method of composite airgel, especially adopting supercritical drying method to prepare massive La 2 o 3 -SiO 2 Preparation method of composite airgel. Background technique [0002] Airgel is a three-dimensional nano-network structure composed of colloidal particles or polymer molecules, and is a new type of nano-porous material. It has the characteristics of high specific surface area, high porosity, low refractive index, ultra-low density, super adsorption, etc., so it has broad application prospects in thermal, optical, electrical, acoustic and other aspects. In terms of heat, the nanoporous network structure of airgel can effectively inhibit solid-phase heat conduction and gas-phase heat transfer, and has excellent heat insul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01B33/16B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/16C01P2004/03C01P2006/16C01P2004/64C01P2006/12C01F17/206
Inventor 沈晓冬仲亚陆春华崔升
Owner NANJING UNIV OF TECH
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