Preparation method of SiO2/TiO2 composite microspheres

A technology of composite microspheres and ammonia water, which is applied in the field of nanomaterials, can solve the problems of high processing temperature, many impurities, and difficult separation and control of products, and achieve the effects of good dispersion, high purity, and shortened preparation cycle

Inactive Publication Date: 2010-11-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the chemical vapor deposition method has the advantages of short cycle and low cost, its SiO 2 /TiO 2 Composite material particles have disadvantages such as wide particle size distribution, uneven particle size distribution, difficult control of Si/Ti ratio, and difficulty in mixing components uniformly, resul

Method used

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  • Preparation method of SiO2/TiO2 composite microspheres

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Comparison scheme
Effect test

Embodiment 1

[0022] A SiO 2 / TiO 2 The preparation method of composite microsphere comprises the following steps:

[0023] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add 1mol of butyl titanate, stir to dissolve the butyl titanate; after dissolving, add 100ml of anhydrous Ethanol and 64.05g of polyethylene glycol (PEG4000), heated to 50°C and stirred to dissolve completely; adjust the pH value to 7.0 with ammonia water to obtain Sol A;

[0024] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add 1mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 100ml of Dehydrated ethanol and 64.05g of polyethylene glycol (PEG4000), heated to 50°C and stirred to dissolve completely; adjusted the pH value to 7.0 with ammonia water, and evaporated in a water bath at 80°C until wet gel B was obtained;

[0025] 3) According to the molar rati...

Embodiment 2

[0029] A SiO 2 / TiO 2 The preparation method of composite microsphere comprises the following steps:

[0030] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.67mol of butyl titanate, stir to dissolve the butyl titanate; Water ethanol and 96.07g of polyethylene glycol (PEG6000), heated to 60°C and stirred to dissolve completely; adjust the pH value to 8.0 with ammonia water to obtain Sol A;

[0031] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.67mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 150ml in turn 96.07g of absolute ethanol and 96.07g of polyethylene glycol (PEG6000), heated to 60°C and stirred to dissolve completely; adjusted the pH value to 8.0 with ammonia water, and evaporated in a water bath at 90°C until wet gel B was obtained;

[0032] 3) According to the molar ratio of Ti:Si=1:5, ...

Embodiment 3

[0035] A SiO 2 / TiO 2 The preparation method of composite microsphere comprises the following steps:

[0036] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.8mol of butyl titanate, stir to dissolve the butyl titanate; Water ethanol and 85g of polyethylene glycol (PEG4000), heated to 56 ° C and stirred to dissolve completely; adjust the pH value to 7.5 with ammonia water to obtain Sol A;

[0037]2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.85mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 100ml in sequence 75g of absolute ethanol and 75g of polyethylene glycol (PEG4000), heated to 50°C and stirred to dissolve completely; adjusted the pH value to 7.0 with ammonia water, and evaporated in a water bath at 90°C until wet gel B was obtained;

[0038] 3) According to the molar ratio of Ti:Si=1:2.5, sol...

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Abstract

The invention discloses a preparation method of SiO2/TiO2 composite microspheres, which comprises the following steps: taking butyl titanate and ethyl orthosilicate as raw materials, taking ammonia and anhydrous alcohol as solvents, taking citric acid as a complexing agent, taking polyoxyethylene as a dispersant, adding sol containing Ti into wet gel containing Si under continuous stirring, then evaporating by a water bath, drying and foaming for leading the two to compound, finally calcining and then preparing the SiO2/TiO2 composite microspheres. The method has short preparation cycle, the prepared SiO2/TiO2 composite microspheres are shaped like complete spheres with the size of 70-200nm, and the purity and the finished product rate are very high.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and relates to a SiO 2 / TiO 2 Preparation method of composite microspheres. Background technique [0002] SiO 2 / TiO 2 Composite material is a non-toxic, non-polluting inorganic non-metallic material, which has high surface activity, good insulation and dielectric properties, strong ability to shield ultraviolet rays and excellent transparency, and is mainly used for catalytic , gas sensors, optoelectronic devices, etc., are widely used in cosmetics, coatings, pigments, photocatalysts and other fields. [0003] Current SiO 2 / TiO 2 The preparation methods of composite materials include sol-gel method, co-precipitation method, chemical vapor deposition and so on. Although the chemical vapor deposition method has the advantages of short cycle and low cost, its SiO 2 / TiO 2 Composite particles have disadvantages such as wide particle size distribution, inhomogeneity, difficulty i...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01G23/053C09C1/36C09C3/10C09C3/04B01J21/08
Inventor 伍媛婷王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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