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

A nano-titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to avoid agglomeration, improve photocatalytic degradation activity, and mild preparation conditions.

Active Publication Date: 2019-03-29
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 100 g of tetrabutyl titanate and 100 g of ethanol into the reactor and stir evenly, control the temperature at 50°C, and slowly add 1 g of polyacrylic acid, 1 g of polyvinylpyrrolidone, and 500 g of water at a stirring speed of 500-1000 rpm. In the system, the mass ratio of tetratitanate: ethanol: polyacrylic acid: polyvinylpyrrolidone: water = 100: 100: 1: 1: 500; a transparent sol was formed after stirring at constant temperature for 3 hours, and then 30 g of commercial nano Titanium dioxide P25, start ultrasonic stirring, continue for 1h, form a transparent colloid; the obtained colloid adopts a conventional pressure spray drying device, and prepares a nano-titanium dioxide photocatalyst with a double particle size distribution at a pressure of 1 MPa and a hot air of 250 ° C, such as figure 1 As shown, the average size of small particles is 6 nm, and the average size of large particles is 25 nm.

[0026]Application effect: Take 10g of the prepared catalyst, add ...

Embodiment 2

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

[0029] Application...

Embodiment 3

[0031] Add 100 g of tetrabutyl titanate and 800 g of ethanol into the reactor and stir evenly, control the temperature at 40°C, and slowly add 10 g of polyacrylic acid, 1 g of polyvinylpyrrolidone, and 100 g of water at a stirring speed of 500-1000 rpm. The mixed solution of tetratitanate: ethanol: polyacrylic acid: polyvinylpyrrolidone: water in the system has a mass ratio of 100:800:10:1:100; a transparent sol is formed after stirring at a constant temperature for 2 hours, and then 50g of commercial nano Titanium dioxide P25, 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 small particle size averaged 6 nm and the large particle size averaged 26 nm.

[0032] Application effect: Take 1g of...

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Abstract

The invention provides a nanometer titanium dioxide photocatalyst with dual particle size distribution and a preparation method thereof, which includes dissolving organic titanate in an alcohol solution, adding dropwise an aqueous solution of polyacrylic acid and polyvinylpyrrolidone under stirring to prepare a transparent titanium dioxide sol; Commercial nanometer titanium dioxide powder is added and ultrasonic stirred to obtain a transparent to translucent titanium dioxide colloid; finally, spray drying is performed to obtain the nanometer titanium dioxide photocatalyst with dual particle size distribution of the present invention. The titanium dioxide photocatalyst prepared by the present invention does not need to add any surfactant and dispersant during use. A highly stable nano titanium dioxide photocatalyst spray liquid can be prepared by adding water and stirring, and can be stably placed for more than 6 months; the catalyst can be stored in the sun for more than 6 months. It has high activity in photocatalytic degradation of organic matter under light, and its degradation rate is more than 40% higher than that of existing commercial nanometer 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 Patents(China)
IPC IPC(8): B01J21/06C02F1/30
CPCC02F1/30B01J21/063C02F2305/10B01J35/40B01J35/39
Inventor 彭锋易正求
Owner 广州市逸都环保科技有限公司
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