TiO2-MxWO3-SiO2 composite aerogel and preparation method thereof

A composite airgel and composite gel technology, applied in the field of TiO2-MxWO3-SiO2 composite airgel and its preparation, to achieve the effect of high pore volume, good heat insulation function, good adsorption/photocatalytic degradation of pollutants

Active Publication Date: 2020-08-28
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of TiO with both adsorption/photocatalysis and heat insulation and energ

Method used

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  • TiO2-MxWO3-SiO2 composite aerogel and preparation method thereof
  • TiO2-MxWO3-SiO2 composite aerogel and preparation method thereof
  • TiO2-MxWO3-SiO2 composite aerogel and preparation method thereof

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preparation example Construction

[0040] TiO of the present invention 2 -M x WO 3 -SiO 2 The in-situ synthesis / atmospheric pressure drying process preparation method of the composite airgel specifically includes the following steps:

[0041] ①Dissolve tungstate in water to obtain a tungstate solution with a concentration of 0.01-5mol / L;

[0042] ②Dissolve silicate into water to obtain a silicate solution with a concentration of 0.01-5mol / L;

[0043] ③Convert the prepared tungstate solution and silicate solution into tungstic acid solution and silicic acid solution respectively by cation exchange method, the tungstic acid solution pH=1~5, the silicic acid solution pH=1~5 6;

[0044] ④Measure a certain volume of silicic acid solution and tungstic acid solution, mix under stirring conditions, and add a certain amount of M salt and inducer, stir and mix evenly, and prepare a mixed sol;

[0045] ⑤Aging the mixed sol at a temperature of 20-90°C until it turns into a gel;

[0046] ⑥The composite gel block is p...

Embodiment 1

[0066] Embodiment 1 prepares 0.4TiO 2 -Cs x WO 3 -2SiO2 2 composite airgel

[0067] ① Preparation of silicic acid and tungstic acid solutions by ion exchange method

[0068] Preparation of silicic acid: Measure 60mL of industrial water glass with a modulus of 3.0, press V 水玻璃 :V 水 =1:4 diluted with deionized water, and then ion-exchanged through a styrene-based cation-exchange resin to obtain silicic acid with a pH of 2 to 3;

[0069] Preparation of tungstic acid: first weigh 19.791g sodium tungstate dihydrate and dissolve in 80mL deionized water to prepare Na 2 WO 4 solution, and then undergo ion exchange through a styrene-based cation exchange resin to obtain a tungstic acid solution with a concentration of 0.75mol / L and a pH of 1.5-3.

[0070] ②Preparation of mixed sol and gel

[0071] Under stirring conditions, weigh 40mL of silicic acid solution, 31mL of tungstic acid solution, 2.1g of cesium sulfate, and 1.646g of citric acid monohydrate and mix them in turn, st...

Embodiment 2

[0080] Embodiment 2 prepares 0.6TiO 2 -Cs x WO 3 -2SiO2 2 composite airgel

[0081] 1. prepare silicic acid and tungstic acid solution by ion exchange method with step 1. in embodiment 1;

[0082] 2. prepare mixed sol and gel, same as embodiment 1 step 2.;

[0083] ③Composite gel aging and solvothermal reaction

[0084] Measure 30ml of absolute ethanol, add 6.935g of citric acid monohydrate, add 4.8mL of butyl titanate dropwise under stirring to prepare the gel block reaction precursor solution, and place the composite gel block in the reaction precursor solution. Aging for 6h, then reacting at 190°C for 72h;

[0085] 4. modification and normal pressure drying of the composite gel, same as step 4. in Example 1;

[0086] 5. the heat treatment of composite airgel, with step 5 in embodiment 1;

[0087] It has been determined that the 0.6TiO prepared by this method 2 -Cs x WO 3 -2SiO2 2 The main crystal phase in the composite airgel is Cs 0.32 WO 3 , and contains a s...

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Abstract

The invention relates to a TiO2-MxWO3-SiO2 composite aerogel and a preparation method thereof, and belongs to the technical field of new materials and energy conservation and environmental protection.The preparation method of the TiO2-MxWO3-SiO2 composite aerogel comprises the following process steps: mixing a silicic acid solution and a tungstic acid solution, then adding an M salt and an inducer, and stirring for mixing uniformity to prepare a mixed sol; aging the mixed sol until the mixed sol is converted into a composite gel block; putting the composite gel block into a reaction precursorsolution prepared from a solvent, butyl titanate and the inducer, carrying out aging treatment in the reaction precursor solution, and reacting the composite gel/reaction precursor solution system at120-400 DEG C for 5-96 h; and washing, modifying, and drying at normal pressure after modification. The preparation method is low in raw material and process cost, short in production period and lowin production equipment requirement, the aerogel production efficiency can be improved, and large-scale industrial production can be achieved conveniently.

Description

technical field [0001] The present invention relates to a kind of TiO 2 -M x WO 3 -SiO 2 The composite airgel and its preparation method belong to the technical fields of new materials, energy conservation and environmental protection. Background technique [0002] With the development of society and the improvement of productivity, the energy crisis and environmental pollution are becoming more and more serious, and energy saving and consumption reduction and environmental purification are increasingly concerned by the whole society. m x WO 3 The material is a semiconductor material with excellent near-infrared shielding properties, M x WO 3 Due to the high carrier concentration caused by its special structure, it has a strong absorption and shielding function for near-infrared light, and it also has a good photocatalytic degradation function for organic pollutants. SiO 2 Airgel has the characteristics of high specific surface area, high porosity and low thermal co...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 史非刘敬肖宋晓颖马静
Owner DALIAN POLYTECHNIC UNIVERSITY
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