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Composite TiO2-SiO2 aerogel and application thereof

A composite airgel and wet gel technology, applied in the field of photocatalytic degradation, can solve problems such as difficult recycling and reuse, easy deactivation, and easy aggregation of powder

Inactive Publication Date: 2014-04-09
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the nano-TiO 2 The powder has problems such as easy aggregation, easy deactivation, and difficulty in recycling and reuse. Therefore, in recent years, TiO2 has been developed at home and abroad. 2 Powder Loading Studies

Method used

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  • Composite TiO2-SiO2 aerogel and application thereof
  • Composite TiO2-SiO2 aerogel and application thereof
  • Composite TiO2-SiO2 aerogel and application thereof

Examples

Experimental program
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Effect test

example 1

[0030] Example 1 Tetraethyl orthosilicate, absolute ethanol, and deionized water were uniformly mixed in a volume ratio of 1:1.32:0.21, and 1.2mol / L HNO 3 Adjust the pH value of the solution to 3.2, hydrolyze at 33°C for 3.5h, and keep stirring to obtain SiO 2 Sol; Tetrabutyl titanate and absolute ethanol are uniformly mixed at a volume ratio of 1:2.3, and 1.2mol / L HNO 3 Adjust the pH value of the solution to 3.1 to obtain solution A, mix absolute ethanol and deionized water at a volume ratio of 4.2:1, and use 1.2mol / L HNO 3 Adjust the pH value of the solution to 3.1 to obtain solution B. Add solution B dropwise to solution A at a speed of 0.3ml / s under stirring. The volume ratio of solution A and solution B is 4.2:1. Hydrolyze at 33°C 0.5h, keep stirring to obtain TiO 2 Sol; under stirring state, according to n(Si):n(Ti)=1:1, mix SiO with the speed of 0.3ml / s 2 The sol was added dropwise to TiO 2 In the sol, take it out after stirring evenly, and let it stand at 33°C unti...

example 2

[0032] Example 2 Mix water glass, absolute ethanol, and deionized water in a volume ratio of 1:1.45:0.36, and use 2.3mol / LHNO 3 Adjust the pH value of the solution to 4, hydrolyze at 40°C for 4 hours, and keep stirring to prepare SiO 2 Sol; Tetrabutyl titanate and absolute ethanol are uniformly mixed at a volume ratio of 1:2.6, and 2.3mol / L HNO 3 Adjust the pH value of the solution to 4.2 to obtain solution A, mix absolute ethanol and deionized water at a volume ratio of 4.5:1, and use 2.3mol / L HNO 3 Adjust the pH value of the solution to 4.1 to obtain solution B, add solution B dropwise to solution A at a speed of 0.45ml / s under stirring, the volume ratio of solution A and solution B is 4.5:1, and hydrolyze at 40°C 0.7h, keep stirring to make TiO 2 Sol; under stirring state, according to n(Si):n(Ti)=1:5, mix SiO with the speed of 0.45ml / s 2 The sol was added dropwise to TiO 2 In the sol, take it out after stirring evenly, and let it stand at 40°C until it coagulates to ob...

example 3

[0034] Example 3 Mix silica sol, absolute ethanol, and deionized water uniformly at a volume ratio of 1:1.59:0.5, adjust the pH of the solution to 4.8 with 3mol / L HCl, hydrolyze at 48°C for 4.5h, and keep stirring to obtain SiO 2 Sol; Titanium tetrachloride and absolute ethanol are uniformly mixed in a volume ratio of 1:2.9, and the pH value of the solution is adjusted to 4.8 with 3mol / L HCl to obtain solution A, and anhydrous ethanol and deionized water are mixed in a volume ratio of 4.9:1 Mix evenly, adjust the pH value of the solution to 4.8 with 3mol / L HCl to obtain solution B, add solution B dropwise to solution A at a speed of 0.6ml / s under stirring, and the volume ratio of solution A to solution B is 4.9 : 1, hydrolyzed at 50°C for 1h, and kept stirring to obtain TiO 2 Sol; under stirring state, according to n(Si):n(Ti)=1:8, mix SiO with the speed of 0.6ml / s 2 The sol was added dropwise to TiO 2 In the sol, take it out after stirring evenly, and let it stand at 50°C u...

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PUM

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Abstract

The invention provides composite TiO2-SiO2 aerogel and an application thereof. The aerogel material has the adsorption performance of SiO2 and the photocatalytic performance of TiO2. A preparation method for the composite TiO2-SiO2 aerogel comprises the following steps of 1, preparing SiO2 sol; 2, preparing TiO2 sol; 3, dropping the SiO2 sol into the TiO2 sol, uniformly stirring the SiO2 sol and the TiO2 sol, standing the sol under room temperature until the sol is condensed, aging the sol mixture through anhydrous ethanol for multiple days, and performing supercritical drying through ethyl alcohol. The preparation technology for the TiO2-SiO2 aerogel is simple; the composite TiO2-SiO2 aerogel has an extremely good effect of degrading explosive powder wastewater.

Description

technical field [0001] The invention belongs to the field of photocatalytic degradation and relates to a TiO 2 -SiO 2 Composite aerogels and their applications. Background technique [0002] The pollution of water resources by chemical organic substances has become the core issue of water pollution control. During the production process of explosives, various waste waters are produced, which contain a large amount of toxic and harmful chemical organic pollutants, which are harmful to the environment and human beings. Most of the chemical organic pollutants in explosive wastewater have stable chemical properties and are difficult to decompose, which limits the use of many water treatment methods to a certain extent. [0003] In recent years, TiO 2 The representative photocatalyst has a good application prospect in the photocatalytic degradation of chemical organic pollutants. However, due to the nano-TiO 2 The powder has problems such as easy aggregation, easy deactivat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08C02F1/30C02F1/32
Inventor 崔升周游沈晓冬周小芳
Owner NANJING TECH UNIV
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