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Preparation of fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst

A nano-titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as the inability to guarantee photocatalytic performance, and achieve easy industrial production, mild reaction conditions, raw materials easy effect

Inactive Publication Date: 2010-10-20
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.

Method used

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  • Preparation of fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst
  • Preparation of fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst
  • Preparation of fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Measure 100mL of 0.05M ammonium fluoride solution and 1mL of ethylenediamine with a content greater than 99wt% in the reactor. Measure 100mL of 1M tetrabutyl titanate solution in absolute ethanol in the dropping funnel, and add the solution of tetrabutyl titanate in absolute ethanol dropwise to the aqueous solution of ammonium fluoride and ethylenediamine under stirring at room temperature. White precipitate. After the dropwise addition was completed, the solution was stirred at room temperature for 12 hours to further hydrolyze the tetrabutyl titanate to obtain a 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 400°C for 2 hours to obtain light gray powdery titanium dioxide co-doped with fluorine and carbon. figure 1 It is the X-ray diffraction pattern of fluorine and carbon co-doped titanium dioxide synthesized in this example, and the diffraction peaks in the figure indicate that t...

Embodiment 2

[0026] Measure 100 mL of 0.1 M ammonium fluoride solution and 1 mL of ethylenediamine with a content greater than 99 wt % in the reactor. Measure 100mL of 1M tetrabutyl titanate solution in absolute ethanol in the dropping funnel, and add the solution of tetrabutyl titanate in absolute ethanol dropwise to ammonium fluoride and ethylenediamine aqueous solution under stirring at room temperature. White precipitate. After the dropwise addition, the solution was stirred at room temperature for 10 hours to further hydrolyze the tetrabutyl titanate to obtain a 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 400°C for 2 hours to obtain a light gray powdery fluorine-carbon co-doped nano-titanium dioxide photocatalyst.

Embodiment 3

[0028] Measure 100mL of 0.05M ammonium fluoride solution and 2mL of ethylenediamine with a content greater than 99wt% in the reactor. Measure 100mL of 1M tetrabutyl titanate solution in absolute ethanol in the dropping funnel, under stirring at room temperature, add the solution of tetrabutyl titanate in absolute ethanol dropwise to ammonium fluoride and ethylenediamine In aqueous solution, a white precipitate appeared. After the dropwise addition, the solution was stirred at room temperature for 8 hours to further hydrolyze the tetrabutyl titanate to obtain a 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 400° C. for 2 hours to obtain a light brown powdery fluorine-carbon co-doped nano-titanium dioxide photocatalyst.

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Abstract

The invention relates to a preparation method of a fluorine and carbon co-doped nano-titanium dioxide visible light photocatalyst, comprising the following steps of: dropping an anhydrous alcohol solution of tetrabutyl titanate into an ammonium fluoride water solution and ethylene diamine by mixing; hydrolyzing by mixing at room temperature, wherein a mol ratio of fluorine to titanium is 0.05:1-0.2:1, and a mol ratio of the ethylene diamine to the tetrabutyl titanate is 0.16:1-0.48:1; obtaining collosol; obtaining flaxen gel by drying the collosol; and obtaining the fluorine and carbon co-doped nano-titanium dioxide photocatalyst by calcining the gel. In the preparation method, the reaction condition is mild and is easy to control, devices are simple, raw materials are easy to purchase, and a synthetic process is simple and is easy to industrially produce; the prepared fluorine and carbon co-doped nano-titanium dioxide photocatalyst has high specific surface, pure crystalling phase, more surface acid sites 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 carbon. Background technique [0002] Titanium dioxide has become a research hotspot in the field of photocatalysis because of its cheapness, non-toxicity and high chemical stability. However, the band gap energy of titanium dioxide is large (~3.2eV), and it can only be excited under the irradiation of ultraviolet light, and ultraviolet light only accounts for 3-5% of sunlight, so it has been greatly affected in practical applications. limit. In order to make full use of sunlight, it is an important issue in this field to modify and modify titanium dioxide to extend its spectral absorption to the visible light region and improve its visible light photocatalytic activity. [0003] The most effective way to expand the spectral absorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/20
Inventor 王宏志曹广秀张青红李耀刚
Owner DONGHUA UNIV
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