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Preparation method of porous titanium dioxide-silica block

A technology of porous titanium dioxide and silicon dioxide, applied in the field of materials, can solve the problems of agglomeration of specific surface area, limitation of photocatalytic effect, etc., and achieve the effect of reducing the uniformity of granulation, crystallization and compounding process, and shortening the preparation period.

Active Publication Date: 2016-09-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of the specific surface area is easy to cause the agglomeration of titanium dioxide-silica composite nanopowders, and the photocatalytic effect of titanium dioxide-silica composite powders is also limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of porous titania-silicon dioxide bulk material, comprising the steps of:

[0017] (1) Measure 50mL of a mixture of absolute ethanol and deionized water (V 无水乙醇 :V 去离子水 =1:2), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, wherein polyethylene glycol Including polyethylene glycol 400, polyethylene glycol 4000 and polyethylene glycol 6000) were added therein, stirred and dissolved to form solution A, and the concentration of each component of the dispersant was controlled at 0.5mol / L.

[0018] (2) Measure 1 / 5 of solution A, dissolve ethyl orthosilicate in it to form solution B for later use; dissolve butyl titanate in the remaining solution A to form solution C, wherein Si:Ti (molar ratio) =1:4, ion:citric acid (molar ratio)=1:0.5. Sol C is obtained by adjusting the pH value to 5-7 with ammonia water (volume...

Embodiment 2

[0022] A preparation method of porous titania-silicon dioxide bulk material, comprising the steps of:

[0023] (1) Measure 50mL of a mixture of absolute ethanol and deionized water (V 无水乙醇 :V 去离子水 =1:3), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol) and add it, stir and dissolve to form Solution A, the concentration of each component of the dispersant is controlled at 0.5mol / L.

[0024] (2) Measure 1 / 5 of solution A, dissolve ethyl orthosilicate in it to form solution B for later use; dissolve butyl titanate in the remaining solution A to form solution C, wherein Si:Ti (molar ratio) =1:8, ion:citric acid (molar ratio)=1:1. Sol C is obtained by adjusting the pH value to 5-7 with ammonia water (volume concentration 25-28%).

[0025] (3) Put sol C in a water bath at 80°C for 20-30 minutes, add solution B into it under constant stirring...

Embodiment 3

[0028] A preparation method of porous titania-silicon dioxide bulk material, comprising the steps of:

[0029] (1) Measure 50mL of a mixture of absolute ethanol and deionized water (V 无水乙醇 :V 去离子水 =1:2), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol) and add it, stir and dissolve to form Solution A, the concentration of each component of the dispersant is controlled at 0.01, 0.12, 0.11, 0.15, 0.33, 0.5mol / L.

[0030] (2) Measure 1 / 5 of solution A, dissolve ethyl orthosilicate in it to form solution B for later use; dissolve butyl titanate in the remaining solution A to form solution C, wherein Si:Ti (molar ratio) =1:6, ion:citric acid (molar ratio)=1:0.6. Sol C is obtained by adjusting the pH value to 5-7 with ammonia water (volume concentration 25-28%).

[0031] (3) Put sol C in a water bath at 85°C for 20-30 minutes, add solution B...

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Abstract

The invention discloses a preparation method of a porous titanium dioxide-silica block. The preparation method comprises respectively adding butyl titanate and ethyl orthosilicate as raw materials into a specific dispersant-containing anhydrous ethanol-deionized water mixed solution, carrying out a water bath reaction process on the butyl titanate solution to obtain butyl titanate semigel, adding the ethyl orthosilicate solution into the semigel, carrying out a stirring reaction process until gelation, directly molding the dried powder and carrying out sintering to obtain the porous titanium dioxide-silica block. The preparation method has the characteristics of simple device, short period and low cost.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a porous titania-silicon dioxide block. Background technique [0002] Nano-titanium dioxide-silica composite material is a highly efficient photocatalyst, which has broad application prospects in the fields of air purification and organic degradation. The main factors affecting the photocatalytic performance of nano-titanium dioxide-silica composite powder materials include powder morphology, particle size, crystal phase composition and degree of dispersion, the reduction of particle size of titanium dioxide-silica composite powder materials, and the The greater the surface activity, the greater the photocatalytic activity. However, the increase of the specific surface area is easy to cause the agglomeration of titanium dioxide-silica composite nano-powders, and the photocatalytic effect of titanium dioxide-silica composite powders is also li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J21/06B01J35/10
CPCB01J21/063B01J21/08B01J35/40B01J35/653B01J35/651B01J35/39
Inventor 伍媛婷栗梦龙王莉丽江红涛
Owner SHAANXI UNIV OF SCI & TECH
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