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Method for preparing TiO2-SiO2 composite aerogel

A composite aerogel, composite sol technology, applied in chemical instruments and methods, colloidal chemistry, colloidal chemistry and other directions, can solve problems such as the adsorption and degradation of unfavorable hydrophobic organic pollutants, the easy moisture absorption of activated carbon, and the decrease in adsorption rate. , to achieve high-efficiency adsorption performance and photocatalytic degradation performance, reduce production costs, and facilitate the preparation process.

Active Publication Date: 2014-04-30
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon is very easy to absorb moisture, and the adsorption rate drops sharply in a humid environment, and the porous sodium zirconium phosphate photocatalyst material used as a carrier is also hydrophilic, which is not conducive to the adsorption and degradation of hydrophobic organic pollutants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] ① Preparation of TiCl 4 Aqueous and silicic acid solutions:

[0062] TiCl with a relative density (water=1) of 1.73 4 As a titanium source, put 200g of ice cubes into a large beaker, add 100ml of TiCl 4 Add it dropwise onto ice cubes slowly, and stir while adding it until 100ml of TiCl 4 Add all in the beaker, keep stirring for 1h, and the obtained TiCl 4 After the aqueous solution is suction filtered to remove impurities, TiCl with a concentration of 3 mol / L is obtained 4 aqueous solution;

[0063] Get 10ml industrial water glass (modulus=3.38, m SiO 2 %=26%, ρ=1.37g / ml) is mixed with 40ml deionized water, after stirring evenly, carry out ion exchange by strongly acidic styrene cation exchange resin, obtain the silicic acid of pH=2~3.

[0064] ② Preparation of TiO 2 -SiO 2 Composite sol:

[0065] Take 11.7ml of silicic acid, then 18.3ml of TiCl 4 The aqueous solution is slowly added dropwise to silicic acid under magnetic stirring to obtain TiO with Ti / Si (m...

Embodiment 2

[0076] ① Preparation of TiCl 4 Aqueous and silicic acid solutions:

[0077] TiCl with a relative density (water=1) of 1.73 4 As a titanium source, put 200g of ice cubes into a large beaker, add 100ml of TiCl 4 Add it dropwise onto ice cubes slowly, and stir while adding it until 100ml of TiCl 4 Add all in the beaker, keep stirring for 1h, and the obtained TiCl 4 After the aqueous solution is suction filtered to remove impurities, TiCl with a concentration of 3 mol / L is obtained 4 aqueous solution;

[0078] Get 10ml industrial water glass (modulus=3.38, m SiO 2 %=26%, ρ=1.37g / ml) is mixed with 40ml deionized water, after stirring evenly, carry out ion exchange by strongly acidic styrene cation exchange resin, obtain the silicic acid of pH=2~3.

[0079] ② Preparation of TiO 2 -SiO 2 Composite sol:

[0080] Take 11.7ml of silicic acid, then 18.3ml of TiCl 4 The aqueous solution is slowly added dropwise to silicic acid under magnetic stirring to obtain TiO with Ti / Si (m...

Embodiment 3

[0091] Same as the preparation method of Example 2, but change the addition amount of the pre-modifier trimethylchlorosilane in step ③ to 6ml; in step ⑤, the modification treatment composite gel time is changed to 22h, and replaced every 6-12h Primary modifier.

[0092] It was determined that the TiO 2 -SiO 2 The specific surface area of ​​the composite airgel is 476.60m 2 / g, BJH desorption cumulative total pore volume 1.02cm 3 / g, the average pore diameter of BJH desorption is 5.44nm, and the most probable pore diameter of BJH desorption is 3.54nm.

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Abstract

The invention provides a method for preparing a TiO2-SiO2 composite aerogel. The method mainly comprises the step of treating with a pre-modifier composed of organosilanes and silane coupling agents. The preparation method provided by the invention can effectively shorten the preparation period, has a convenient and feasible process, and is suitable for large-scale industrial production and application.

Description

technical field [0001] The present invention relates to a kind of TiO 2 -SiO 2 The invention discloses a method for preparing composite airgel, which belongs to the technical field of adsorption / photocatalytic materials for water and air purification. Background technique [0002] TiO 2 Due to its stable performance, strong catalytic activity, non-toxic and environmental protection, photocatalyst has been widely concerned by researchers at home and abroad for a long time. In order to further improve the TiO 2 The photocatalytic efficiency of the photocatalyst can be combined with the method of adsorption / photocatalysis, and the adsorption performance of the porous material and the photocatalytic performance of the photocatalyst can be used to simultaneously adsorb and degrade pollutants, thereby improving the photocatalytic efficiency. For example, porous materials such as activated carbon (LI You ji, et al. Environmental Chemistry, 2004 23 (6)) or porous sodium zirconiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
Inventor 刘敬肖白麓楠史非王晓杰
Owner DALIAN POLYTECHNIC UNIVERSITY