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Preparation method of porous SiO2 coated nano TiO2 particles

A nano-particle technology, which is applied in the field of preparation of porous SiO2-coated nano-TiO2 particles, can solve the problems of difficult reaction activity factor, lower reaction efficiency, and influence on photocatalytic reaction rate, and achieve low cost, simple process, and adjustable pore size. control effect

Inactive Publication Date: 2015-07-29
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But if nano TiO 2 There is a dense inorganic protective layer outside the particles, which makes it difficult for the reactive factors to come into contact with the reaction medium, thus affecting the photocatalytic reaction rate and reducing the reaction efficiency

Method used

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  • Preparation method of porous SiO2 coated nano TiO2 particles
  • Preparation method of porous SiO2 coated nano TiO2 particles
  • Preparation method of porous SiO2 coated nano TiO2 particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 2.0g TiO 2 1.5g of polyvinylpyrrolidone was added to 200mL of ethanol, then stirred at room temperature for 10min at a speed of 500r / min, then 1.5g of sodium polystyrene sulfonate was added, and stirred at room temperature for 10min; then 1.0g of normal Slowly add the mixed solution of butyl silicate and 1.5g methyl orthosilicate into the mixed solution, mechanically stir at room temperature at a speed of 500r / min for 10min, then raise the temperature to 60°C and continue stirring for 60min to fully react. After the reaction, cool at room temperature and filter, dry the obtained solid product and then calcinate at 600°C for 3 hours to obtain mesoporous SiO 2 Coated Nano TiO 2 composite particles.

[0025] Depend on figure 1 It can be seen that A is the particle size distribution map, B is the Zeta potential map of the particle surface, and TiO 2 The average particle size of the nanoparticles was 21.8 nm, and the Zeta potential was -19.9 mV. After electrostatic adso...

Embodiment 2

[0030] 2.0g TiO 2 1.5g of polyvinylpyrrolidone was added to 200mL of water and ethanol mixed solution (volume ratio: 1:1), mechanically stirred at room temperature, the speed was 1000r / min, and the time was 10min; 2.0g of ethyl orthosilicate The ester was slowly added into the mixed solution, mechanically stirred at a speed of 200r / min at room temperature for 10min, and then the temperature was raised to 70°C and continued to stir for 30min to fully react. After the reaction, cool at room temperature and filter, dry the solid product and then calcinate at 650°C for 2 hours to obtain mesoporous SiO 2 Coated Nano TiO 2 composite particles.

Embodiment 3

[0032] 2.0g TiO 2 1.5g of polyvinylpyrrolidone was added to 200mL of glycerol, mechanically stirred at room temperature, the rotating speed was 500r / min, and the time was 20min; then 1.5g of sodium dodecylsulfonate was added, and stirring was continued for 10min at room temperature ; Slowly add 2.5g butyl orthosilicate into the mixed solution, stir mechanically at room temperature at a speed of 500r / min for 10min, then raise the temperature to 60°C and continue stirring for 60min to fully react. After the reaction, cool at room temperature and filter, dry the obtained solid product and then calcinate at 500°C for 3.5h to obtain mesoporous SiO 2 Coated Nano TiO 2 composite particles.

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Abstract

A preparation method of porous SiO2 coated nano TiO2 particles is characterized by comprising steps as follows: 1), the nano TiO2 particles are dispersed in a solution containing an organic surface active agent, organic surface active agent molecules are adsorbed on the surfaces of the nano TiO2 particles under the electrostatic interaction, and organic coating layers are formed; 2), organic silicate ester is added to the solution obtained from the step 1), and the organic coating layers are covered with SiO2 layers under the action of hydrolysis; 3), composite particles obtained from the step 2) are separated and subjected to calcination treatment, the organic coating layers are decomposed, gas produced in the decomposition process breaks through the SiO2 layers, and a mesoporous structure is formed. Each nano TiO2 particle is coated with one inorganic SiO2 protecting layer and prevented from being directly contacted with a carrier material; a large amount of hydroxyl exists on the surface of SiO2 of the inorganic protecting layers, and modification treatment on the surface can be facilitated, so that the porous SiO2 coated nano TiO2 particles have a good binding force function with the organic carriers.

Description

technical field [0001] The invention relates to a porous SiO 2 Coated Nano TiO 2 The particle preparation method belongs to the technical field of inorganic functional materials. Background technique [0002] With the awareness of the harm of environmental degradation to human life and the improvement of environmental protection requirements, capturing energy from solar energy and directly converting it into chemical energy, which is used to degrade and eliminate organic pollutants in the environment, is the least impact on the environment. One of the direct and effective "green" ways. Nano-TiO 2 It has the characteristics of stable chemical properties, strong oxidizing ability, insoluble, non-toxic, etc., and is an ideal photocatalyst. Chinese patents CN1463790, CN1459331, CN1448214, CN1450123 disclose nano-TiO 2 Has good photocatalytic properties. Under light conditions, its photocatalytic reaction can completely degrade organic pollutants, bacteria and viruses into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01J21/08B01J13/02
Inventor 江国华江腾腾姚菊明孔祥东
Owner ZHEJIANG SCI-TECH UNIV
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