Method for preparing TiO2 visible light photocatalyst

A photocatalyst and visible light technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems that limit the application of visible light photocatalysts, achieve excellent visible light photocatalytic performance, simple operation, and reaction The effect of mild conditions

Inactive Publication Date: 2008-02-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing preparation method is a high-temperature sputtering decomposition method (Spray Pyrolysis, SP), which requires high temperature conditions as high as 900 ° C, and simple equipment and technical conditions are difficult to meet, which greatly limits the co-doped TiO 2 The application of visible light photocatalysts, so the low-temperature preparation method at room temperature and slightly higher than room temperature is particularly worth looking forward to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Tetraisopropyl titanate and ethanol were reacted at a molar ratio of 0.5:1 for 2 minutes to obtain a transparent liquid. Afterwards, the liquid was added dropwise into deionized water so that the molar ratio of tetraisopropyl titanate to water was 1:80, while vigorously stirring. After forming a white suspension, adjust the pH value to 1 with HCl, then undergo ultrasonic treatment for 10 minutes, and react at 160°C for 5 hours to obtain TiO 2 nanocrystalline sol.

[0021] Under rapid stirring, tetramethylammonium bromide was added dropwise to TiO 2 In the nanocrystalline sol, after the dropwise addition, the reflux reaction was continued for 5 hours, and then the solvent was evaporated under reduced pressure to obtain a brown xerogel. Extract the obtained xerogel with ethanol as a solvent for 5 hours, and then dry it at 100°C for 30 minutes to obtain a brown yellow powder TiO 2 Visible light photocatalyst. The brown-yellow powder has strong absorption in the visible...

Embodiment 2

[0023] Tetraisopropyl titanate and ethanol were reacted at a molar ratio of 0.5:1 for 5 minutes to obtain a transparent liquid. Afterwards, the liquid was added dropwise into deionized water so that the molar ratio of tetraisopropyl titanate to water was 1:100, while vigorously stirring. After forming a white suspension, adjust the pH value to 2 with HCl, then undergo ultrasonic treatment for 15 minutes, and react at 100°C for 10 hours to obtain TiO 2 nanocrystalline sol.

[0024] Under rapid stirring, tetraethylammonium bromide was added dropwise to TiO 2 In the nanocrystalline sol, after the dropwise addition, the reflux reaction was continued for 5 hours, and then the solvent was evaporated under reduced pressure to obtain a brown xerogel. The obtained xerogel was extracted with ethanol as a solvent for 8 hours, and then dried at 110°C for 25 minutes to obtain a brown yellow powder TiO 2 Visible light photocatalyst. The brown-yellow powder has strong absorption in the v...

Embodiment 3

[0026] Tetraethyl titanate and ethanol were reacted at a molar ratio of 1:1 for 3 minutes to obtain a transparent liquid. Afterwards, the liquid was added dropwise into deionized water so that the molar ratio of tetraethyl titanate to water was 1:100, while vigorously stirring. After forming a white suspension, use HNO 3 Adjust the pH value to 1.5, and then undergo ultrasonic treatment for 15 minutes, and react at 150°C for 5 hours to obtain TiO 2 nanocrystalline sol.

[0027] Under rapid stirring, cetyltrimethylammonium bromide was added dropwise to TiO 2 In the nanocrystalline sol, after the dropwise addition, the reflux reaction was continued for 10 hours, and then the solvent was evaporated under reduced pressure to obtain a brown xerogel. The obtained xerogel was extracted with ethanol as solvent for 10 hours, and then dried at 110°C for 30 minutes to obtain brown yellow powder TiO 2 Visible light photocatalyst. The brown-yellow powder has strong absorption in the vi...

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Abstract

The invention relates to a preparing method for the TiO2 visible light catalyst. The method is to make the titanium salt react with the ethanol to get the transparent liquid, drop the liquid into the deionized water to form the white suspension, adjust the pH value with the inorganic acid, and then process with the ultra sound in eighty to one hundred and sixty DEG C for five to twenty hours to get the TiO2 nanometer crystal sol; and then drop the ammonium bromide into the TiO2 nanometer crystal sol, implement circumfluent reaction for five to ten hours, then decompress and evaporate the solvent to get the dry gel, extract the dry gel taking the ethanol as the solvent, and dry in one hundred to one hundred and twenty DEG C to obtain the TiO2 visible light catalyst. The invention has the advantages of simple operation, gentle reaction condition, and low cost of device, strong visible light absorbing and good visible light catalyzing capability, etc.

Description

technical field [0001] The invention belongs to a kind of TiO 2 Preparation method of visible light photocatalyst. technical background [0002] TiO 2 It is the most widely used photocatalyst, but its band gap (anatase Eg=3.2eV) is relatively wide, and it can only use ultraviolet light accounting for 3-4% of sunlight, which seriously restricts its effective use of solar energy. It is modified so that its absorption edge extends to the visible region. Numerous research results have shown that TiO 2 The non-metal N anion doping can make it have excellent visible light absorption, while TiO 2 The halogen anion doping can produce Ti 3+ , greatly improving the TiO 2 Quantum efficiency of photocatalysts. Therefore, halogens co-dope TiO with anions of N 2 Photocatalyst is a very ideal visible light photocatalyst. However, the existing preparation method is a high-temperature sputtering decomposition method (Spray Pyrolysis, SP), which requires high temperature conditions a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06
Inventor 孙予罕盛永刚徐耀吴东
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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