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Preparation method of modified TiO2 with visible light response

A visible light and modified technology, applied in the field of photocatalytic materials, can solve the problems of harsh process conditions, high preparation cost and high temperature conditions, and achieve the effects of simple post-treatment process, low reaction temperature and short process flow

Inactive Publication Date: 2013-04-03
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the preparation of modified nano-TiO 2 The method has the problems of cumbersome steps, high temperature conditions, harsh process conditions, and high preparation costs.

Method used

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  • Preparation method of modified TiO2 with visible light response
  • Preparation method of modified TiO2 with visible light response
  • Preparation method of modified TiO2 with visible light response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a 50ml small beaker, while stirring with a magnetic stirrer, add 10.00ml of absolute ethanol and 3.00ml of ethylene glycol, then slowly add 10.00ml of tetrabutyl titanate as a raw material, stir for 10min, and form a light yellow transparent liquid; then add fluorine Add 0.0108 g of ammonia, stir until the solid particles are completely dissolved, finally add 16 ml of 6 mol / L HCl solution dropwise, stir until the solution is clear, and obtain a reaction solution. The reaction solution was transferred to a 50ml autoclave, heated to 195oC, and the product was taken out after 10 hours of constant temperature. The product was washed three times with absolute ethanol, then washed three times with deionized water, placed in a vacuum distillation device, and distilled under reduced pressure at 0.05MPa and 80oC for 20 minutes to obtain a light yellow powdery solid, which is a visible light response modification Nano-TiO 2 .

[0039] Characterized by XRD and TEM, visible l...

Embodiment 2

[0041] In a 50ml small beaker, while stirring with a magnetic stirrer, add 10.00ml of absolute ethanol, 3.00ml of ethylene glycol, and slowly add 10.00ml of tetrabutyl titanate as a raw material, stir for 10min, and form a light yellow transparent liquid; then add urea 0.0176 g, stirred until the solid particles were completely dissolved, and finally added dropwise 16 ml of 6mol / L sulfuric acid solution, stirred until the solution became clear to obtain a reaction solution. The reaction solution was transferred to a 50ml autoclave, heated to 210oC, and the product was taken out after 12 hours of constant temperature. The product was washed twice with absolute ethanol, then washed twice with deionized water, placed in a vacuum distillation device for 20 minutes under reduced pressure at 80oC, to obtain a light yellow powdery solid, which is a visible light response modified nano-TiO 2 .

[0042] After XRD and TEM characterization, the modified nano-TiO 2 The particle size is ...

Embodiment 3

[0044] In a 50ml small beaker, while stirring with a magnetic stirrer, add 10.00ml of absolute ethanol, 3.00ml of ethylene glycol, 10.00ml of tetrabutyl titanate as a raw material, and stir for 10min to form a light yellow transparent liquid. Add 0.0176g of urea, fluorine Add 0.0108 g of ammonia, stir until the solid particles are completely dissolved, and finally add 16 ml of 6 mol / L HCl solution dropwise, and stir until the solution is clear to obtain a reaction solution. Transfer the reaction solution into a 50ml autoclave, heat to 230°C, and take out the product after 10 hours at a constant temperature. The product is washed three times with absolute ethanol, and then washed three times with deionized water, and put into a vacuum distillation device. Distilled under reduced pressure at MPa and 50oC for 25 minutes to obtain a light yellow powdery solid, which is a visible light-responsive modified nano-TiO 2 .

[0045] After XRD and TEM characterization, the modified nano...

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Abstract

The invention relates to a preparation method of modified TiO2 with visible light response, and belongs to the technical field of photocatalytic materials. The preparation method is completed by adopting a one-step charge method and a one-step reaction through a constant temperature reaction at a temperature of 190-230 DEG C by using tetrabutyl titanate as a raw material, absolute ethyl alcohol as an organic solvent, urea and / or ammonium fluoride as a modifier and a hydrochloric acid solution or sulfuric acid solution as an acidity regulator. The preparation method is simple and practical in process steps, relatively low in reaction temperature and simple in post-treatment process. The preparation method has the advantages of easily obtained raw materials, easily controllable reaction parameters, short reaction flow and low energy consumption. The particle size of the modified TiO2 with visible light response is between 3 nm and 9 nm, the modified TiO2 with visible light response presents an anatase phase and has obvious absorption in a visible region at the wavelength of 400-600 nm, and the band gap energy is reduced to below 3.0 eV.

Description

technical field [0001] The invention relates to a visible light response modified nano-TiO 2 The preparation method belongs to the technical field of photocatalytic materials. Background technique [0002] TiO 2 With its non-toxic, cheap, stable structure and performance, scientists have always considered it to be the most potential photocatalytic material, and it is widely used in sewage treatment and air purification. TiO 2 The bandgap energy of nano-TiO is 3.2eV, and it can only absorb ultraviolet light with a wavelength less than 387nm. The energy of this part of light only accounts for about 4% of the energy of sunlight; in addition, nano-TiO 2 The easy recombination of photogenerated electrons and photogenerated holes is also one of the unfavorable factors that limit its application. Nano-TiO 2 The focus of photocatalytic performance research has been on how to expand its photoresponse range and how to improve the utilization rate of photogenerated carriers. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 于洁玫黄太仲刘宗明张以河翟利民齐蕾何畏
Owner UNIV OF JINAN
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