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SiO2-WO3 composite aerogel and preparation method thereof

A composite aerogel and composite gel technology are applied in the field of atmospheric drying preparation of SiO2-WO3 composite aerogel, which can solve the problems of high cost and complicated process, and achieve the effects of high pore volume, large specific surface area and low density.

Active Publication Date: 2012-10-31
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical drying technology can often successfully obtain porous structures, but because supercritical drying requires the use of autoclaves, the process is complicated, the cost is high, and there are certain risks

Method used

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  • SiO2-WO3 composite aerogel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of SiO with Si / W (molar ratio) = 12:1 2 -WO 3 Composite airgel:

[0045] ① Preparation of silicic acid solution and tungstic acid solution:

[0046] Preparation of silicic acid solution: measure 10ml industrial water glass (modulus=3.38, m SiO 2 %=26%, ρ=1.37g / ml), mix with 40ml deionized water, then carry out ion exchange with strongly acidic styrene cation exchange resin, obtain the silicic acid solution of pH=2~3;

[0047] Preparation of tungstic acid solution: accurately weigh 8.24g sodium tungstate (Na 2 WO 4 2H 2 (2), join in the deionized water of 50ml, magnetically stir, after it fully dissolves evenly, obtain the sodium tungstate solution that concentration is 0.5mol / L, carry out ion exchange with strongly acidic styrene cation exchange resin, obtain pH=1 ~1.5 tungstic acid solution;

[0048] ② Preparation of SiO 2 -WO 3 Sol:

[0049] Mix 2ml of tungstic acid solution with 10ml of silicic acid solution, and adjust the pH to 3.5 with 1mol / ...

Embodiment 2

[0058] Preparation of SiO with Si / W (molar ratio)=6:1 2 -WO 3 Composite airgel:

[0059] ① Preparation of silicic acid solution and tungstic acid solution:

[0060] Preparation of silicic acid solution: measure 10ml industrial water glass (modulus=3.38, m SiO 2 %=26%, ρ=1.37g / ml), mix with 40ml deionized water, then carry out ion exchange with strongly acidic styrene cation exchange resin, obtain the silicic acid solution of pH=2~3;

[0061] Preparation of tungstic acid solution: accurately weigh 8.24g sodium tungstate (Na 2 WO 4 2H 2 (2), join in the deionized water of 50ml, magnetically stir, after it fully dissolves evenly, obtain the sodium tungstate solution that concentration is 0.5mol / L, carry out ion exchange with strongly acidic styrene cation exchange resin, obtain pH=1 ~1.5 tungstic acid solution;

[0062] ② Preparation of SiO 2 -WO 3 Composite sol:

[0063] Mix 4ml of tungstic acid solution with 10ml of silicic acid solution, and adjust the pH to 3.5 wit...

Embodiment 3

[0072] Preparation of SiO with Si / W (molar ratio) = 12:1 2 -WO 3 Composite airgel:

[0073] ① Preparation of silicic acid solution and tungstic acid solution:

[0074] Preparation of silicic acid solution: measure 10ml industrial water glass (modulus=3.38, m SiO 2%=26%, ρ=1.37g / ml), mix with 40ml deionized water, then carry out ion exchange with strongly acidic styrene cation exchange resin, obtain the silicic acid solution of pH=2~3;

[0075] Preparation of tungstic acid solution: accurately weigh 8.24g sodium tungstate (Na 2 WO 4 2H 2 (2), join in the deionized water of 50ml, magnetically stir, after it fully dissolves evenly, obtain the sodium tungstate solution that concentration is 0.5mol / L, carry out ion exchange with strongly acidic styrene cation exchange resin, obtain pH=1 ~1.5 tungstic acid solution;

[0076] ② Preparation of SiO 2 -WO 3 Composite sol:

[0077] Mix 2ml of tungstic acid solution with 10ml of silicic acid solution, and adjust the pH to 3.5 w...

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Abstract

The invention provides SiO2-WO3 composite aerogel and a preparation method thereof. The specific surface area of the SiO2-WO3 composite aerogel is 329 to 720m<2> / g, the pore volume is 0.6 to 1.8 cm<3> / g, the BJH most probable aperture is 4 to 10 nm and the average aperture is 4 to 9 nm. The preparation method mainly comprises: firstly, synthesizing SiO2-WO3 sol-gel by using sodium tungstate and industrial sodium silicate as raw materials; secondly, modifying a gel block by using modifying solution consisting organic silazane, organic siloxane and an alkane reagent; and finally, replacing porewater. The aerogel product has the characteristics of high specific surface area and high pore volume, the preparation method adopts cheap and readily available sodium tungstate and industrial sodiumsilicate raw materials and therefore can reduce production cost, and a normal pressure drying process is convenient and easy to implement and is suitable for industrial production and use.

Description

technical field [0001] The present invention relates to SiO with high specific surface area 2 -WO 3 A method for preparing a composite airgel by normal-pressure drying. Background technique [0002] Tungsten oxide (WO 3 ) is an n-type semiconducting metal oxide with many unique properties, such as exhibiting excellent electrochromic, photochromic, gas-sensitivity, and photocatalytic activities. Due to the small band gap (2.4-2.8eV) of tungsten oxide, it has potential visible light catalytic ability. Currently, WO 3 As a photocatalytic material, people have received extensive attention. It was found that WO 3 / TiO 2 Nanomaterials have better properties than pure TiO 2 Better photocatalytic performance (D.N.Ke, H.J.Liu, T.Y.Peng, et.al.Mater.Lett.2008, 62:447.), especially WO loaded with nano-Pt particles 3 Exhibits excellent photocatalytic activity for photocatalytic decomposition of organic pollutants (Ryu Abe, Hitoshi Takami, Naoya Murakami et al. J. Am. Chem. Soc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30B01J20/28B01J23/30B01J35/10
Inventor 刘敬肖史非陈晨张志伟
Owner DALIAN POLYTECHNIC UNIVERSITY
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