Titanium dioxide photocatalyst with coating layer coated on surface and preparation method thereof

A titanium dioxide and surface coating technology, applied in the field of catalysis, can solve problems such as emission restrictions, and achieve the effects of improving adsorption capacity, improving photocatalytic rate, and improving ultraviolet photocatalytic activity

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

However, as an important pollutant in water bodies, fluoride ions have strict discharge restrictions in the country

Method used

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  • Titanium dioxide photocatalyst with coating layer coated on surface and preparation method thereof
  • Titanium dioxide photocatalyst with coating layer coated on surface and preparation method thereof
  • Titanium dioxide photocatalyst with coating layer coated on surface and preparation method thereof

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preparation example Construction

[0026] Method 1 A method for preparing a titanium dioxide photocatalyst whose surface is coated with a metal fluoride coating layer, i.e. an alkali method, comprises the following steps:

[0027] 1) At room temperature, the precursor titanium dioxide is dispersed in an aqueous solution of a metal ion salt as a precipitant, TiO 2 The molar ratio to the metal ion is 100:2 to 100:40;

[0028] 2) Under vigorous stirring, add fluoride salt solution, TiO 2 The molar ratio to fluoride ion is 100:4~100:120;

[0029] 3) by adding a pH regulator, the pH value of the reaction solution is 8-11;

[0030] 4) React for 2 hours at 60°C to 100°C;

[0031] 5) After cooling to room temperature, the precipitate is filtered, washed with water, dried at 70° C. to 120° C., and ground into powder to obtain a titanium dioxide photocatalyst coated with a fluoride coating on the surface.

[0032] The above process is expressed as follows (where M n+ for metal ions):

[0033]

[0034] Method 2, ...

Embodiment 1

[0068] Take 1g of commercial anatase phase titanium oxide (AT), and disperse it in 100ml with a concentration of 6mM (mM is 10 -3 mol / L) of Ca(NO 3 ) 2 In aqueous solution (Solution S1), placed on a magnetic stirrer at room temperature to stir, slowly drop into 100mL of NH with a concentration of 12mM 4 F in water (Solution S2). By adding 20% ​​dilute ammonia water, the pH value of the control system is about 10. After the dropwise addition was completed, the suspension was heated to 80° C. in a water bath and kept at this temperature for 2 hours. After cooling to room temperature naturally, the suspension was aged overnight. Gained precipitate was filtered, washed, and dried at 60°C to obtain calcium fluoride-coated titanium dioxide catalyst A (see Figure 1~4 middle line A). where TiO 2 The molar ratio of Ca and F elements is 100:4.8:9.6. Using the above photocatalytic activity evaluation method, after irradiating with ultraviolet light for 1 hour, the degradation ra...

Embodiment 2

[0070] Take 1g of commercial anatase phase titanium oxide and disperse it in 100ml of Ca(NO 3 ) 2 in aqueous solution. While boiling, slowly drop 100mL 3mM (NH 4 ) 2 HPO 4 with 1mM NH 4 A mixed solution of F. By adding 20% ​​dilute ammonia water, the pH value of the control system is about 9. After the dropwise addition was completed, the suspension was aged at 80° C. for 1 hour. After naturally cooling to room temperature, the resulting precipitate was filtered, washed, and dried overnight at 60°C to obtain fluoroapatite-coated titanium dioxide catalyst B (see Figure 1~4 middle line B). where TiO 2 The molar ratio of Ca element, P element and F element is 100:4.0:2.4:0.8. Using the above photocatalytic activity evaluation method, the degradation rate of phenol was 48.70% after being irradiated with ultraviolet light for 1 hour.

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Abstract

The invention provides a titanium dioxide photocatalyst with a coating layer coated on a surface, which comprises a titanium dioxide powder particle, wherein a fluoride coating layer, a fluoride-phosphate coating layer or a fluorapatite coating layer is arranged outside the titanium dioxide powder particle. Compared with an ordinary titanium dioxide powder particle, the photocatalytic speed is markedly increased. The invention also provides a preparation method of the titanium dioxide photocatalyst with the coating layer coated on the surface, which comprises the following steps of: depositing titanium dioxide as a precursor and a metal fluoride, a fluoride-phosphate mixture or fluorapatite as a coating material on the surface of the titanium dioxide powder particle by using a wet chemical method and preparing a product under the condition of not changing the crystal structure, the crystal phase composition and the average particle diameter of the titanium dioxide as the precursor. The titanium dioxide photocatalyst has low cost of the used raw materials, simple equipment and easy operation; compared with the pure titanium dioxide, the ultraviolet light catalytic activity of the obtained product is markedly improved, and meanwhile, the adsorption capacity for an organic pollutant is also enhanced.

Description

technical field [0001] The invention relates to a titanium dioxide catalyst and a preparation method thereof, belonging to the technical field of catalysis, and more specifically, the invention provides a surface containing a metal fluoride coating layer, a metal fluoride co-phosphate coating layer or fluorapatite Titanium dioxide nano powder photocatalyst with coating layer and high catalytic activity and preparation method thereof. Background technique [0002] In the 21st century, energy shortage and environmental pollution are becoming more and more serious, which have become the main problems facing the world today. Therefore, governments, scientists and technicians of various countries have actively taken measures to deal with it. Among many treatment methods, semiconductor photocatalysis technology is particularly attractive. It can directly use ultraviolet light from various channels including sunlight, and can completely decompose various organic or inorganic pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J27/18B01J21/06B01J37/03C02F1/32C02F101/34
Inventor 许宜铭丛杉
Owner ZHEJIANG UNIV
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