Composite aerogel photocatalyst for recovering titanium dioxide/silicon dioxide

A composite aerogel, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. It can achieve the effect of easy recycling, high photocatalytic activity and uniform pore distribution.

Inactive Publication Date: 2008-11-19
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhang Jinlong and others disclosed a preparation method of titanium dioxide mesoporous material in the patent CN1594102A. The material is prepared by using titanate hydrolysis method to obtain nanoparticles, and then using surfactant as a linking agent to connect the nanoparticles. Among them, nano-titanium dioxide The particles are in the anatase phase, but according to our experiments, nano-scale particles are generally not obtained by titanate hydrolysis, and the patent is only for TiO 2 Unary substance
Deng et al reported TiO on Nanostructure Materials11(1999) 1313 2 Airgel and TiO in different proportions 2 -SiO 2 The

Method used

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  • Composite aerogel photocatalyst for recovering titanium dioxide/silicon dioxide
  • Composite aerogel photocatalyst for recovering titanium dioxide/silicon dioxide
  • Composite aerogel photocatalyst for recovering titanium dioxide/silicon dioxide

Examples

Experimental program
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Example Embodiment

[0036] Example one

[0037] (1) Take out 5ml of ethyl orthosilicate and pour it into the beaker, then pour 6.5ml of absolute ethanol into the beaker, stir while pouring, then add 1.2ml of deionized water, and finally adjust the pH of the mixed solution with nitric acid Is 0.6. Let the above solution be hydrolyzed at a constant temperature of 80°C for 30 minutes, and then stand still to continue the hydrolysis.

[0038] (2) Mix 23ml of butyl titanate and 34.5ml of absolute ethanol uniformly, and add 1.61ml of formamide dropwise, adjust the pH of the solution to 1 with nitric acid to obtain solution 1; combine 23ml of absolute ethanol and 2.8ml of ethanol Deionized water was mixed uniformly in a certain proportion, and the pH of the solution was adjusted to 0.6 with nitric acid to obtain solution 2. Under the strong stirring of a magnetic stirrer, the solution 2 was slowly added dropwise to solution 1 with a dropper at room temperature at a speed of about 90 Drops / min, continue to s...

Example Embodiment

[0040] Example two

[0041] (1) Take out 2.52ml of ethyl orthosilicate and pour it into the beaker, then pour 3.28ml of absolute ethanol into the beaker, stir while pouring, then add 0.6ml of deionized water, and finally adjust the pH of the mixed solution with nitric acid The value is 0.8. Let the above solution be hydrolyzed at a constant temperature of 80°C for 40 minutes, and then stand still to continue the hydrolysis.

[0042] (2) Mix 26ml of butyl titanate and 39.5ml of absolute ethanol uniformly, and add 1.56ml of formamide dropwise, adjust the pH of the solution to 0.8 with nitric acid to obtain solution 1; combine 26ml of absolute ethanol and 3.25ml of ethanol Mix deionized water uniformly in a certain proportion, and adjust the pH of the solution to 0.8 with nitric acid to obtain solution 2. Under the strong stirring of a magnetic stirrer, slowly drop solution 2 into solution 1 with a dropper at room temperature at a speed of about 90 Drops / min, continue to stir for 1~2...

Example Embodiment

[0044] Example three

[0045] (1) Take out 10ml of ethyl orthosilicate and pour it into the beaker, then pour 13ml of absolute ethanol into the beaker, stir while pouring, then add 2.4ml of deionized water, and finally adjust the pH of the mixed solution with nitric acid 0.6. Let the above solution be hydrolyzed at a constant temperature of 80°C for 40 minutes, and then stand still to continue the hydrolysis.

[0046] (2) Mix 26ml of butyl titanate and 39.5ml of absolute ethanol uniformly, and add 1.56ml of formamide dropwise, adjust the pH of the solution to 0.6 with nitric acid, to obtain solution 1; combine 26ml of absolute ethanol and 3.25ml of ethanol Mix deionized water uniformly in a certain proportion, and adjust the pH of the solution to 1.0 with nitric acid to obtain solution 2. Under the strong stirring of a magnetic stirrer, slowly drop solution 2 into solution 1 with a dropper at room temperature at a speed of about 90 Drops / min, continue to stir for 1~2min to make th...

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Abstract

The invention relates to a recoverable TiO2-SiO2 composite aero-gel photo-catalyst as well as the preparation method thereof. The invention is characterized in that the sol-gel method is firstly utilized for respectively preparing TiO2 sol and SiO2 sol, then the two are mixed according to a certain proportion to obtain a mixed sol, and then TiO2-SiO2 composite alcogel is obtained through polycondensation reaction; the TiO2-SiO2 composite alcogel is used for preparing TiO2-SiO2 composite aero-gel after drying, and the composite aerogel is used for obtaining composite aero-gel aggregates after baking for 6 to 8 hours. The pore size of the obtained composite aero-gel aggregates is distributed between 2.5 nm to 10 nm, and the particle diameter is distributed between 10 nm to 15 nm, while the particle diameter of the aggregates is distributed between 0.1 mm and 0.3 mm. Compared with the prior art, the TiO2-SiO2 composite aero-gel photo-catalyst has the advantages that the prepared TiO2-SiO2 composite aero-gel has large specific surface area, high porosity, uniform pore distribution, etc., wherein, TiO2 is in the anatase crystal form. Compared with the TiO2 nanometer powder absorbent, the photo catalytic activity of the TiO2-SiO2 composite aero-gel is higher, the photo catalytic efficiency is better, and the regeneration and the reuse of the composite aero-gel are convenient as the particles of the aero-gel aggregates are larger, thereby the recoverable TiO2-SiO2 composite aero-gel photo-catalyst is widely applicable to the treatment of a great amount of wastewater.

Description

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Claims

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Application Information

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Owner PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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