Nitrogen/fluorine-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants under visible light

A titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, water pollutants, chemical/physical processes, etc., can solve the problems of low solar energy utilization, low quantum yield, etc., to promote the separation of photogenerated carriers, Good photocatalytic performance and the effect of reducing the recombination rate

Active Publication Date: 2012-02-15
LIAONING UNIVERSITY
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Problems solved by technology

[0003] But TiO 2 Photocatalytic technology is facing two major

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  • Nitrogen/fluorine-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants under visible light
  • Nitrogen/fluorine-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants under visible light
  • Nitrogen/fluorine-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants under visible light

Examples

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Example Embodiment

[0024] Example 1 Nitrogen and fluorine doped titanium dioxide photocatalyst

[0025] (1) Preparation method

[0026] (1) Under rapid stirring, slowly drop 10 mL (0.03 mol) of butyl titanate into the mixed solution of 30 mL ethanol and 4.0 mL glacial acetic acid, stir for 30 min, and then add 5 ml dropwise with a concentration of 0.12 mol / L of hydrofluoric acid solution, stir to form a transparent mixed solution A; mix 5 ml of 0.12 mol / L ammonia with 10 ml of ethanol, adjust the pH to 2 with 1.0 mol / L nitric acid, and prepare solution B. The solution B is slowly dropped into the solution A to obtain a uniform transparent sol. Aging in the air for 24 hours to obtain a solid gel, drying at 80 ℃ for 12 hours, grinding into powder, and then placed in a muffle furnace 500 ℃ calcination 40 minutes, the molar percentage of N and Ti is 2%, F Nitrogen and fluorine doped titanium dioxide photocatalyst powder with a molar percentage of 2% to Ti. This catalyst is labeled N,F-TiO 2 (1).

...

Example Embodiment

[0043] Example 2 Nitrogen and fluorine doped titanium dioxide photocatalyst

[0044] Preparation method: Under rapid stirring, slowly drop 10 mL (0.03 mol) butyl titanate into the mixed solution of 30 mL ethanol and 4.0 mL glacial acetic acid, and stir for 30 min; then add 5 ml dropwise with a concentration of 0.06 mol / L hydrofluoric acid solution, stir to form a transparent mixed solution A; mix 5 ml of 0.06 mol / L ammonia water with 10 ml of ethanol, adjust the pH to 2 with 1 mol / L nitric acid, and prepare solution B. The solution B is slowly dropped into the solution A to obtain a uniform transparent sol. Aging in the air for 24 h to obtain a solid gel, drying at 80 ℃ for 12 h, grinding into powder, and then placing it in a muffle furnace at 500 ℃ for 40 min calcination, the molar percentages of N, F and Ti are 1%. The nitrogen and fluorine doped titanium dioxide photocatalyst.

[0045] Similarly, change the concentration of hydrofluoric acid solution and ammonia water to 0.1...

Example Embodiment

[0050] Example 3 Nitrogen and fluorine doped titanium dioxide photocatalyst

[0051] Preparation method: The method is the same as that of Example 1, but the difference is: calcination at 300°C, 400°C, 500°C, 600°C, and 700°C for 40 min.

[0052] Degradation experiment: adjust the concentration of Acid Red B to 10.0 mg / L and pH to 5.6; add nitrogen and fluorine doped titanium dioxide photocatalyst 1.5 g / L; visible light power is 128 W, and the irradiation time is 1.0 h. The degradation rate is shown in Table 4.

[0053] Table 4 The effect of different roasting temperatures on the degradation of Acid Red B

[0054] Roasting temperature (℃)300400500600700 Removal rate%10060.633.330.712.5

[0055] It can be seen from Table 4 that when the calcination temperature is 300°C, the removal rate of Acid Red B reaches 100%. This is because at lower temperatures, TiO 2 The crystallization has not been completed, the sample contains more amorphous TiO 2 Therefore, the catalyst has a certain...

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Abstract

The invention relates to a nitrogen/fluorine-doped titanium dioxide photocatalyst and application thereof in degrading organic pollutants under visible light. The technical scheme is as follows: the preparation method comprises the following steps: while evenly stirring, slowly and dropwisely adding tetrabutyl titanate into an ethanol-glacial acetic acid mixed solution, dropwisely adding a hydrofluoric acid solution, and stirring to form a transparent mixed solution A; mixing ammonia water and ethanol, and regulating the pH value to 2 to obtain a solution B; slowly and dropwisely adding the solution B into the solution A to obtain a uniform and transparent sol; aging the uniform and transparent collosol in air to obtain a solid gel; and drying, grinding into powder, and roasting in a muffle furnace at 400-500 DEG C for 40 minutes to 1.5 hours, thereby obtaining the nitrogen/fluorine-doped titanium dioxide photocatalyst. The invention widens the visible light response range of TiO2, and reduces the combination of electrons and holes, thereby increasing the utilization ratio of TiO2 for solar power and enhancing the photocatalytic activity.

Description

technical field [0001] The invention relates to a titanium dioxide photocatalyst and its application, in particular to a titanium dioxide photocatalyst doped with nitrogen and fluorine and its application in visible light degradation of 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 studied photocatalyst today. Its application range is extremely wide, and it has huge potential application value in sewage treatment, air purification, sterilization, leather industry, cosmetics and other fields. It can not only convert light energy into chemical energy, but also photocatalytically oxidize most organic pollutants in water and air, including dyes, surfactants, pesticides and other toxic organic pollutants that are difficult to biodegrade, degrade the final The product is CO 2 , H 2 O and other inorganic ions. In recent years, it has ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCY02W10/37
Inventor 张朝红王君王丽涛李芳轶徐瑶
Owner LIAONING UNIVERSITY
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