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Cerium, nitrogen and fluoride co-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants in visible light

A technology of titanium dioxide and photocatalyst, which is applied in the direction of physical/chemical process catalyst, chemical/physical process, light water/sewage treatment, etc., can solve the problems of low solar energy utilization rate and low quantum yield, and achieve good visible photocatalytic performance Effect

Active Publication Date: 2012-06-20
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But TiO 2 Photocatalytic technology is facing two major problems of low quantum yield and low solar energy utilization

Method used

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  • Cerium, nitrogen and fluoride co-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants in visible light
  • Cerium, nitrogen and fluoride co-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants in visible light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Cerium nitrogen and fluorine co-doped titanium dioxide photocatalyst

[0024] (1) Preparation method

[0025] Under rapid stirring, 10 mL (0.03 mol) of butyl titanate was slowly dropped into a mixed solution of 30 mL of ethanol and 4.0 mL of glacial acetic acid, stirred for 30 min, and then 5 mL of hydrogen with a concentration of 0.12 mol / L was added dropwise. Fluoric acid solution, stir to form a transparent mixed solution A; mix 5ml of ammonia water with a concentration of 0.12 mol / L and 10ml of ethanol, add 1.5×10 -5 mol of cerium nitrate, adjust the pH to 2 with 1.0 mol / L nitric acid, and prepare solution B; slowly drop solution B into solution A to obtain a uniform transparent sol; place it in the air for 24 h to obtain a solid gel; Dry at 80°C for 12 h, grind into powder, place in a muffle furnace at 500°C, and bake for 60 min to obtain a cerium nitrogen-fluorine co-doped titanium dioxide photocatalyst, labeled as Ce-N-F-TiO 2 . The molar ratio ...

Embodiment 2

[0035] Example 2 Cerium nitrogen and fluoride co-doped titanium dioxide photocatalyst

[0036] (1) Preparation method

[0037] Under rapid stirring, slowly drop 10 mL (0.03 mol) of butyl titanate into a mixed solution of 30 mL of ethanol and 4.0 mL of glacial acetic acid, and stir for 30 min; then add 5 mL of hydrogen with a concentration of 0.12 mol / L dropwise Fluoric acid solution, stir to form a transparent mixed solution A; mix 5 ml of ammonia water with a concentration of 0.12 mol / L and 10 ml of ethanol, add 1.5×10 -5 mol, 3.0×10 -5 mol, 4.5×10 -5 mol, 6.0×10 -5 mol of cerium nitrate, adjust the pH to 2 with 1mol / L nitric acid, and make solution B. Solution B was slowly dropped into solution A to obtain a uniform transparent sol. Placed in the air for 24 h to obtain a solid gel, dried at 80 °C for 12 h, ground into powder, and then placed in a muffle furnace at 500 °C for 60 min to obtain a molar ratio of N to Ti of 2%, F and The molar ratio of Ti is 2%, and...

Embodiment 3

[0043] Example 3 Cerium nitrogen and fluoride co-doped titanium dioxide photocatalyst

[0044] (1) Preparation method

[0045] The method is the same as that of Example 1, except for the difference: in a muffle furnace, roast at 300°C, 400°C, 500°C, 600°C and 700°C for 60 min.

[0046] (2) Degradation experiment

[0047] The concentration of BPA was adjusted to 10.0 mg / L, and the pH was 5.7; 2.0 g / L of cerium nitrogen and fluoride co-doped titanium dioxide photocatalyst was added; the visible light power was 128 W, and the irradiation time was 4.0 h. The degradation rate is shown in Table 3.

[0048] table 3

[0049] Heat treatment temperature (℃) Degradation rate% (276nm) 300 100 (removal rate) 400 68.60 500 66.44 600 4.00 700 0.50

[0050] It can be seen from Table 3 that when the calcination temperature is 300°C, the TiO 2 The crystallization has not been completed, and the sample contains more amorphous TiO 2 , has a ...

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Abstract

The invention relates to a cerium, nitrogen and fluoride co-doped titanium dioxide photocatalyst and the application thereof in degrading organic pollutants in visible light. The invention adopts the technical scheme that: butyl titanate is stirred and slowly dripped into the mixed solution of ethanol and glacial acetic acid; after the mixed solution is stirred uniformly, hydrofluoric acid solution is added drip by drip and stirred, and transparent mixed solution A is formed; ammonia and the ethanol are mixed, cerium nitrate is added in, the pH value is regulated to be 2, and solution B is prepared; the solution B is slowly dripped into the solution A, and uniform and transparent sol is obtained; the sol stays and is aged in the air, and solid gel is obtained; and the solid gel is dried and ground into powder, put into a Francesca furnace to be roasted for 40min to 1.5h at 400DEG C to 500DEG C, and the cerium, nitrogen and fluoride co-doped titanium dioxide photocatalyst is prepared. The photocatalyst and the application thereof improve the utilization rate of titanium dioxide (TiO2) to solar energy, and improve the visible light catalysis activity. Under the action of visible light, the photocatalyst and the application thereof have good degradation effect to the organic pollutants.

Description

technical field [0001] The invention relates to a titanium dioxide photocatalyst and its application, in particular to the preparation of a cerium nitrogen and fluorine co-doped titanium dioxide photocatalyst and its application in effectively utilizing visible light to degrade organic pollutants. Background technique [0002] TiO 2 It is favored by people because of its stable chemical properties, high catalytic activity, low cost, and non-toxicity. It is the most popular photocatalyst today. Its application range is extremely wide, and it has great potential application value in the fields of sewage treatment, air purification, sterilization, leather industry and cosmetics. It can not only convert light energy into chemical energy, but also realize photocatalytic oxidation of most organic pollutants in water and air, including dyes, surfactants and pesticides and other toxic organic pollutants that are difficult to biodegrade. The final product is CO 2 , H 2 O and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCY02W10/37
Inventor 张朝红王君陈忠林李芳轶徐瑶张丰秋刘丹妮
Owner LIAONING UNIVERSITY
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