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Preparation method of porous silicon dioxide-titanium dioxide bulk material

A technology of porous silica and titania, which is applied in the field of materials, can solve the problems of easy aggregation of particles, high surface activity, unfavorable photocatalytic effect of silica-titania powder, etc., and achieve uniform micropore formation process and excellent preparation process Less process, better controllability of pore size and distribution

Active Publication Date: 2016-07-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size of nano-silica-titania particles, a large number of broken bonds on the surface, and high surface activity, the particles are easy to agglomerate, which is not conducive to the photocatalytic effect of silica-titania powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of porous silicon dioxide-titanium dioxide block material includes the following steps:

[0018] (1) Measure 50 mL of a mixture of absolute ethanol and deionized water (V Absolute ethanol : V Deionized water =1:1), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, and polyethylene glycol Including polyethylene glycol 400, polyethylene glycol 4000 and polyethylene glycol 6000) were added to it, stirred and dissolved to form solution A, and the concentration of each component of the dispersant was controlled at 1.0 mol / L.

[0019] (2) Measure 1 / 5 of solution A, dissolve butyl titanate in it to form solution B for later use; dissolve ethyl orthosilicate in the remaining solution A to form solution C, where Ti:Si (molar ratio) =1:5, ion:citric acid (molar ratio)=1:1. Sol C is obtained by adjusting the pH value to 7-9 w...

Embodiment 2

[0023] A preparation method of porous silicon dioxide-titanium dioxide block material includes the following steps:

[0024] (1) Measure 50 mL of a mixture of absolute ethanol and deionized water (V Absolute ethanol : V Deionized water =1: 2), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol), add it, stir and dissolve to form Solution A, the concentration of each component of the dispersant is controlled at 0.5mol / L.

[0025] (2) Measure 1 / 5 of solution A, dissolve butyl titanate in it to form solution B for later use; dissolve ethyl orthosilicate in the remaining solution A to form solution C, where Ti:Si (molar ratio) =1:9, ion:citric acid (molar ratio)=1:1.5. Sol C is obtained by adjusting the pH value to 7-9 with ammonia water (submitted concentration 25-28%).

[0026] (3) Put Sol C in a water bath at 85°C for 20-30 minutes, add solution ...

Embodiment 3

[0029] A preparation method of porous silicon dioxide-titanium dioxide block material includes the following steps:

[0030] (1) Measure 50 mL of a mixture of absolute ethanol and deionized water (V Absolute ethanol : V Deionized water =1:1.5), weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol), add it, stir and dissolve to form Solution A, the concentration of each component of the dispersant is controlled at 0.01, 0.22, 0.52, 0.58, 0.58, 1.0mol / L.

[0031] (2) Measure 1 / 5 of solution A, dissolve butyl titanate in it to form solution B for later use; dissolve ethyl orthosilicate in the remaining solution A to form solution C, where Ti:Si (molar ratio) =1:6, ion:citric acid (molar ratio)=1:1.2. Sol C is obtained by adjusting the pH value to 7-9 with ammonia water (volume concentration 25-28%).

[0032] (3) Put Sol C in a water bath at 85°C for ...

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Abstract

The invention discloses a preparation method of a porous silicon dioxide-titanium dioxide bulk material. The method comprises the following steps: with edetic acid, citric acid, diethylene triamine carboxylic acid, tartaric acid, ethylene glycol and polyethylene glycol as dispersants, dissolving the dispersants into a mixed solution of absolute ethyl alcohol and deionized water in a specific volume ratio; adding butyl titanate and ethyl orthosilicate to the mixed solution respectively; carrying out gel reaction on the ethyl orthosilicate solution, adding a butyl titanate solution after a certain period of time, and drying the solution to form powder after gelation; and carrying out direct pressing and molding and thermal treatment on the powder to obtain the porous silicon dioxide-titanium dioxide bulk material. The method is simple in process, short in period, simple in equipment and low in cost; and the pore size and the distribution controllability of the obtained porous material are high.

Description

Technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a porous silica-titania block material. Background technique [0002] Nano-titanium dioxide is an important high-efficiency photocatalyst. It not only has the characteristics of good weather resistance and non-toxicity, but also has high photocatalytic activity due to high specific surface area. It is widely used in air purification and organic matter degradation. In addition to the composite silicon dioxide material in the titanium dioxide material, the durability and thermal stability of the material can be effectively improved, and its ultraviolet absorption capacity can also be enhanced. This is a great effect of the silicon dioxide-titanium dioxide composite material in the aspect of photocatalytic materials. The application is advantageous. However, due to the small particle size of the nano-silica-titania particles, the surface has a large ...

Claims

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Application Information

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