Porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material and preparation method thereof

A technology of porous silica and photocatalytic materials, which is applied in the field of photocatalytic materials, can solve the problems of non-size selectivity, irregular organic membrane, and unstable structure, and achieve excellent degradation effect, uniform mesopore size, good Barrier degradation and anti-corrosion effects

Inactive Publication Date: 2017-08-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is used to solve the problems that the existing titanium dioxide photocatalytic materials do not have size selectivity, unstable and irregular structure, and cause corrosion to organic films

Method used

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  • Porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material and preparation method thereof
  • Porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material and preparation method thereof
  • Porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of the nano-powder photocatalyst of porous silicon dioxide coating titania, comprises the steps:

[0044] Measure 60mL of deionized water and 15mL of ethanol in a three-necked flask, add 4g of nano-titanium dioxide (P25) and 0.4g of sodium dodecylsulfonate to stir and ultrasonically disperse to obtain a uniform dispersion, add ammonia water to the pH of the dispersion while stirring to 9, slowly add 0.5 mL of tetraethyl silicate. Placed at 60°C for 2 hours, filtered and washed to obtain a white powder, and calcined at 550°C for 2 hours to obtain a nano-powder photocatalytic material of porous silicon dioxide coated titanium dioxide. The particle size of the obtained powder photocatalytic material is 50-70nm, the particle size distribution is narrow, and the thickness of the silicon dioxide coating layer is 5-15nm.

[0045] figure 1 Shows the raw material P25 (A) and the obtained photocatalytic material TiO 2 @SiO 2 TEM image of the core-shell ...

Embodiment 2

[0049] The preparation method of the nano-powder photocatalyst of porous silicon dioxide coating titania, comprises the steps:

[0050] Measure 60mL of deionized water and 15mL of ethanol in a three-necked flask, add 4g of nano-titanium dioxide (PC500) and 0.4g of cetyltrimethylammonium bromide, stir and ultrasonically disperse to obtain a uniform dispersion, add ammonia water to The pH of the dispersion was 10, and 0.5 mL of tetraethyl silicate was slowly added. Placed at 60°C for 2 hours, filtered and washed to obtain a white powder, calcined at 550°C for 2 hours to remove the surfactant, and obtained a nano-powder photocatalytic material of porous silicon dioxide coated titanium dioxide. The particle size of the obtained powder photocatalytic material is 90-100nm, and the specific surface area is 512m 2 / g, the thickness of the silica coating layer is 6-9 nm, and the mesopore diameter is 2-3 nm.

Embodiment 3

[0052] The preparation method of the nano-powder photocatalyst of porous silicon dioxide coating titania, comprises the steps:

[0053] Measure 60mL of deionized water and 15mL of ethanol in a three-necked flask, add 4g of nano-titanium dioxide (ST-31) and 0.4g of polyvinylpyrrolidone to stir and ultrasonically disperse to obtain a uniform dispersion, add sodium hydroxide to the pH of the dispersion while stirring to 10, slowly add 0.5 mL of tetraethyl silicate. Placed at 60°C for 2 hours, filtered and washed to obtain a white powder, and calcined at 550°C for 2 hours to obtain a nano-powder photocatalytic material of porous silicon dioxide coated titanium dioxide. The obtained powder photocatalytic material has a particle size of 70-100nm and a specific surface area of ​​508m 2 / g, the thickness of the silica coating layer is 7-10 nm, and the mesopore diameter is 2-3 nm.

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Abstract

The invention discloses a porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material. In the porous silicon dioxide-coated titanium dioxide nanopowder photocatalytic material, the particle size of titanium dioxide is 30-100nm, the thickness of a silicon dioxide coating layer is 5-15nm, silicon dioxide contains mesopores, and the pore diameter is 2-3nm. The invention also discloses a preparation method of the photocatalytic material. The preparation method is simple, easy to implement and low in production cost, and the obtained powder photocatalytic material can degrade organic and inorganic small-molecule gases and organic fuel rather than macromolecular dyes and has no photocorrosion on a supported organic base.

Description

technical field [0001] The invention relates to the field of photocatalytic materials. More specifically, it relates to a porous silicon dioxide-coated titanium dioxide nano-powder photocatalytic material and a preparation method thereof. Background technique [0002] With the development of industrialization and urbanization, air pollution has become one of the main environmental hazards. Nitrogen oxide is the main component of air pollution, which mainly comes from the combustion of fossil energy; nitrogen oxide will cause a series of atmospheric environmental problems, such as smog, photochemical smog, acid rain and so on. Therefore, the treatment of polluted gases has attracted the attention of many researchers and related industries. However, the current catalytic reduction (SCR) and non-catalytic reduction (SNCR) methods for removing nitrogen oxides are only corresponding industrial removal schemes. Neither SCR nor SNCR is a good solution for PPB-level pollution sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01D53/86B01D53/56C02F1/32C09D1/00C09D5/08C08J7/06C02F101/30C02F101/36C02F101/38
CPCB01D53/007B01D53/8628B01D2259/804B01J21/08B01J35/004B01J35/0086C02F1/32C02F2101/308C02F2101/36C02F2101/38C02F2101/40C02F2305/10C08J7/06C08J2367/02C09D1/00C09D5/08
Inventor 只金芳宋乐吴良专孙东峰
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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