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Iron, nitrogen and fluoride co-doped titanium dioxide (TiO2) photocatalyst and application thereof in degrading organic pollutants in visible light

A technology of organic pollutants and photocatalysts, applied in water pollutants, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low solar energy utilization, low quantum yield, etc. Good photocatalytic performance and inhibition of recombination

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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  • Iron, nitrogen and fluoride co-doped titanium dioxide (TiO2) photocatalyst and application thereof in degrading organic pollutants in visible light
  • Iron, nitrogen and fluoride co-doped titanium dioxide (TiO2) photocatalyst and application thereof in degrading organic pollutants in visible light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Iron Nitrogen Fluoride Co-doped TiO 2 catalyst of light

[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 0.3636g (9×10 -4 mol) ferric 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 iron, nitrogen and fluoride co-doped TiO 2 Photocatalyst, labeled as Fe-N-F-TiO 2 . The molar ratio of Fe to Ti ...

Embodiment 2

[0035] Example 2 Iron Nitrogen Fluoride Co-doped TiO 2 catalyst of light

[0036] (1) Preparation method

[0037] 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, and stirred for 30 min; 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 5 ml of ammonia water with a concentration of 0.12 mol / L and 10 ml of ethanol, add 0.1212 g (3.0×10 -4 mol), 0.2424 g (6.0×10 -4 mol), 0.3636g (9.0×10 -4 mol), 0.4848g (1.2×10 -3 mol) of ferric 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...

Embodiment 3

[0043] Example 3 Iron Nitrogen Fluoride Co-doped TiO 2 catalyst of light

[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 iron, nitrogen and fluoride co-doped titanium dioxide photocatalyst was added; the visible light power was 128 W, and the irradiation time was 3.0 h. The degradation rate is shown in Table 3.

[0048] table 3

[0049] Heat treatment temperature (℃) Degradation rate% (276nm) 300 100(removal rate) 400 78.1 500 76.71 600 15.6 700 18.6

[0050] It can be seen from Table 3 that when the calcination temperature is 300°C, BPA is completely removed. This is because at lower temperatures, TiO 2 The crystallization has not been completed, an...

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Abstract

The invention relates to an iron, nitrogen and fluoride co-doped titanium dioxide (TiO2) 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, ferric 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 iron, nitrogen and fluoride co-doped TiO2 photocatalyst is prepared. The photocatalyst and the application thereof expand the visible light response scope of the TiO2 and reduce the composition of electrons and cavities, so that the utilization rate of TiO2 to the solar energy and the light catalysis activity of the TiO2 are improved.

Description

technical field [0001] The invention relates to titanium dioxide photocatalyst and its application, in particular to a kind of iron, nitrogen and fluorine co-doped TiO 2 Photocatalyst 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/34C02F101/30
CPCY02W10/37
Inventor 张朝红王君郜炜李芳轶徐瑶张丰秋刘丹妮
Owner LIAONING UNIVERSITY
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