Nano titanium dioxide photocatalyst with double-particle size distribution and preparation method thereof

A technology of nano-titanium dioxide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve good application effects, prevent corrosion and hazards, and achieve mild preparation conditions.

Active Publication Date: 2017-05-03
广州市逸都环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report of this highly active nano-titanium dioxide solid powder with sol properties at home and abroad.

Method used

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  • Nano titanium dioxide photocatalyst with double-particle size distribution and preparation method thereof
  • Nano titanium dioxide photocatalyst with double-particle size distribution and preparation method thereof
  • Nano titanium dioxide photocatalyst with double-particle size distribution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 100g of tetrabutyl titanate and 100g of ethanol into the reactor and stir evenly, control the temperature at 50°C, and slowly add 1g of polyacrylic acid, 1g of polyvinylpyrrolidone, and 500g of water at a stirring speed of 500-1000 rpm. Solution, the mass ratio of tetratitanate titanate: ethanol: polyacrylic acid: polyvinylpyrrolidone: water = 100:100:1:1:500 in the system; a transparent sol was formed after stirring at a constant temperature for 3 hours, and then 30g of commercial nano-titanium dioxide P25 was added, Start ultrasonic stirring and continue for 1h to form a transparent colloid; the obtained colloid adopts a conventional pressure spray drying device to prepare a nano-titanium dioxide photocatalyst with a double particle size distribution at a pressure of 1MPa and a hot air of 250°C, such as figure 1 As shown, the average diameter of small particles is 6nm, and the average diameter of large particles is 25nm.

[0026]Application effect: Take 10g of the...

Embodiment 2

[0028] Add 100g tetraisopropyl titanate and 400g propanol into the reactor and stir evenly, control the temperature at 30°C, and slowly add 10g polyacrylic acid, 0.1g polyvinylpyrrolidone, 400g under the condition of stirring speed 500-1000 rpm A mixed solution of water, the mass ratio of tetratitanate: ethanol: polyacrylic acid: polyvinylpyrrolidone: water = 100:400:10:0.1:400 in the system; a transparent sol is formed after stirring at a constant temperature for 5 hours, and then 10g of commercial nano Titanium dioxide P25, start ultrasonic stirring, and continue for 3 hours to form a transparent colloid; the obtained colloid adopts a conventional pressure spray drying device to prepare a nano-titanium dioxide photocatalyst with a double particle size distribution at a pressure of 5 MPa and a hot air of 200 ° C, such as figure 2 As shown, the small particle diameter is 8nm on average, and the large particle diameter is 28nm on average.

[0029] Application effect: Take 50g ...

Embodiment 3

[0031] Add 100g of tetrabutyl titanate and 800g of ethanol into the reactor and stir evenly, control the temperature at 40°C, and slowly add 10g of polyacrylic acid, 1g of polyvinylpyrrolidone, and 100g of water under the condition of a stirring speed of 500-1000 rpm. Solution, the mass ratio of titanate tetraester in the system: ethanol: polyacrylic acid: polyvinylpyrrolidone: water = 100:800:10:1:100; a transparent sol was formed after stirring at a constant temperature for 2 hours, and then 50g of commercial nano-titanium dioxide P25 was added, Start ultrasonic stirring and continue for 1 hour to form a translucent colloid; the obtained colloid is prepared using a conventional pressure spray drying device at a pressure of 10 MPa and hot air at 150°C to prepare a nano-titanium dioxide photocatalyst with a double particle size distribution. result with figure 1 Similarly, the average size of the small particles is 6 nm and the average size of the large particles is 26 nm.

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Abstract

The invention provides a nano titanium dioxide photocatalyst with double-particle size distribution and a preparation method thereof. The method includes: dissolving an organic titanate in an alcohol solution, adding an aqueous solution of polyacrylic acid and polyvinylpyrrolidone dropwise under stirring to prepare a transparent titanium dioxide sol; then adding a commodity nano titanium dioxide powder and carrying out ultrasonic stirring to obtain titanium dioxide colloids from transparent to translucent; and finally conducting spray drying, thus obtaining the nano titanium dioxide photocatalyst with double-particle size distribution. The titanium dioxide photocatalyst prepared by the method provided by the invention has no need for adding any surfactant or dispersant during use, by water adding and stirring, a high-stability nano titanium dioxide photocatalyst spray solution can be prepared, and can be placed stably for more than 6 months. The catalyst provided by the invention has high activity on photocatalytic degradation of organic matters under sunlight, and the degradation rate is 40% higher than that the existing commodity nano titanium dioxide P25.

Description

technical field [0001] The invention relates to a nano-titanium dioxide photocatalyst with double particle size distribution and a preparation method thereof. In application, the photocatalyst can directly prepare a stable and dispersed nano-titanium dioxide spraying liquid with water, and can be stored stably for more than 6 months. At the same time, it is better than the current market The photocatalytic activity of existing nano titanium dioxide is higher. The photocatalyst prepared by the method is expected to produce good economic and environmental benefits when popularized in environmental treatment, and belongs to the field of environmental materials. Background technique [0002] The so-called photocatalyst is a substance that can promote chemical reactions after being irradiated with light. Because photocatalysts can deal with extremely low concentrations of harmful chemical substances in the air or water, and can completely decompose harmful organic substances int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/30
CPCB01J21/063B01J35/004B01J35/023C02F1/30C02F2305/10
Inventor 彭锋易正求
Owner 广州市逸都环保科技有限公司
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