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Preparation method of fluorine and lanthanum co-doped nano titanic oxide visible light photocatalyst

A nano-titanium dioxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as inability to guarantee photocatalytic performance, and achieve easy industrialization Simple production and equipment, pure crystal phase effect

Inactive Publication Date: 2010-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these doped titania have visible light response, it does not guarantee improved photocatalytic performance.
At present, there is no literature report on the synthesis of fluorine and lanthanum co-doped nano-titanium dioxide visible light photocatalyst by the improved sol-gel method

Method used

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  • Preparation method of fluorine and lanthanum co-doped nano titanic oxide visible light photocatalyst
  • Preparation method of fluorine and lanthanum co-doped nano titanic oxide visible light photocatalyst
  • Preparation method of fluorine and lanthanum co-doped nano titanic oxide visible light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Measure 100mL of 0.1M ammonium fluoride solution in the reactor. Measure 100mL of 2M tetrabutyl titanate and 0.03M lanthanum nitrate ethanol solution in the dropping funnel, and add the ethanol solution of tetrabutyl titanate and lanthanum nitrate dropwise into the ammonium fluoride solution under stirring at room temperature , a white precipitate appeared. After the dropwise addition, the solution was stirred at room temperature for 12 hours to further hydrolyze the tetrabutyl titanate to obtain a monodisperse sol. Then the sol was dried at 80°C for 12 hours, and the water and ethanol were evaporated to obtain a pale yellow gel. Calcined at 500°C for 2 hours to obtain white powdery titanium dioxide co-doped with fluorine and lanthanum. Fig. 1 is a transmission electron microscope photograph of the sample, as can be seen: the particle size of the sample synthesized in this embodiment is 11nm. Fig. 2 is an X-ray diffraction pattern of titanium dioxide co-doped with fl...

Embodiment 2

[0028] Measure 100mL of 0.2M ammonium fluoride solution in the reactor. Measure 200mL of 1M tetrabutyl titanate and 0.04M lanthanum nitrate ethanol solution in the dropping funnel, and add the tetrabutyl titanate and lanthanum nitrate ethanol solution dropwise into the ammonium fluoride solution under stirring at room temperature , a white precipitate appeared. After the dropwise addition, the mixture was stirred at room temperature for 10 hours to further hydrolyze the tetrabutyl titanate to obtain a monodisperse sol. Then the sol was dried at 100°C for 10 hours, and the water and ethanol were evaporated to obtain a pale yellow gel. Calcined at 600°C for 2 hours to obtain white powdery titanium dioxide co-doped with fluorine and lanthanum. The X-ray diffraction pattern of the titanium dioxide co-doped with fluorine and lanthanum synthesized in this example shows that the crystal phase of the sample is mainly the anatase phase of titanium dioxide, and a small part of the rut...

Embodiment 3

[0030] Measure 100mL of 0.4M ammonium fluoride solution in the reactor. Measure 100mL of 2M tetrabutyl titanate and 0.02M lanthanum nitrate absolute ethanol solution in the dropping funnel, under stirring at room temperature, add the ethanol solution of tetrabutyl titanate and lanthanum nitrate dropwise to the fluorine In the ammonium chloride solution, a white precipitate appeared. After the dropwise addition, the mixture was stirred at room temperature for 8 hours to further hydrolyze the tetrabutyl titanate to obtain a monodisperse sol. Then the sol was dried at 100°C for 10 hours, and the water and ethanol were evaporated to obtain a pale yellow gel. Calcined at 500°C for 2 hours to obtain white powdery titanium dioxide co-doped with fluorine and lanthanum. The X-ray diffraction pattern of the titanium dioxide co-doped with fluorine and lanthanum synthesized in this example shows that the crystal phase of the sample is mainly the anatase phase of titanium dioxide. The u...

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Abstract

The invention relates to a preparation method for fluorine and lanthanum codoped nanometer TiO2 visible-light photocatalyst, in which titanium alkoxide, lanthanum nitrate and fluoride are used as the raw materials. First, the fluoride is dissolved in the water, and then the titanium alkoxide and the lanthanum nitrate absolute ethyl alcohol solutions are dipped into the fluoride water solution while stirring, and finally the monodisperse TiO2 sol is obtained after stirring at room temperature for a certain period of time for hydrolyzation. Then the TiO2 sol is dried to obtain light-yellow gel which can produce the nanometer TiO2 photocatalyst while calcined at different temperatures. The method has mild and easily-controlled reaction conditions, simple equipment, easily purchased raw materials, simple synthesized process and easy industrial production. And the prepared fluorine and lanthanum codoped nanometer TiO2 photocatalyst has the properties of high specific surface, pure crystal phase, multiple surface acidity points and visible light response.

Description

technical field [0001] The invention belongs to the field of preparation of nano titanium dioxide visible light photocatalyst, in particular to a preparation method of nano titanium dioxide visible light photocatalyst co-doped with fluorine and lanthanum. Background technique [0002] Due to its low cost and high chemical stability, titanium dioxide has become a research hotspot in the field of photocatalysis. However, titanium dioxide has a large band gap (~3.2eV) and can only absorb ultraviolet light, which only accounts for 3-5% of sunlight, so its application is greatly limited. In order to make full use of sunlight and indoor light, modifying its energy band structure to absorb visible light and improve photocatalytic activity is still an important issue in this field. [0003] The spectral absorption and photocatalytic activity of titanium dioxide depend on its energy band structure, and the most effective way to change the energy band structure and extend its absorpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135B01J21/06B01J23/10
Inventor 王宏志曹广秀张青红李耀刚
Owner DONGHUA UNIV
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