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Method for preparing ferrum-fluorine-codoped 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 large band gap energy, low solar energy utilization, and low photogenerated carrier efficiency. , to achieve the effect of small particle size, good photocatalytic performance and simple equipment

Inactive Publication Date: 2012-06-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide has two obvious shortcomings as a photocatalytic material: on the one hand, titanium dioxide is a wide-bandgap semiconductor with a large band gap (~3.2eV), which can only absorb ultraviolet light with a small wavelength, and the solar energy utilization rate is low.
On the other hand, photogenerated electrons and photogenerated holes are very easy to recombine, and the efficiency of photogenerated carriers is low.
Fe 3+ with F - Report on preparation and characterization of co-doped nano-titanium dioxide visible light photocatalyst

Method used

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  • Method for preparing ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst
  • Method for preparing ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst
  • Method for preparing ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0033] At room temperature, measure 45.8ml of 0.8M tetrabutyl titanate ethanol solution into the reactor and stir evenly. Slowly add 1.00ml of nitric acid (analytical grade, 65-68wt%) dropwise, and continue stirring for 30 minutes. Measure 18ml of 0.0014M ferric chloride and 0.10M ammonium fluoride ethanol solution, add dropwise into the reactor, and stir at room temperature for 30min, hydrolysis reaction occurs, and light yellow titanium dioxide sol is obtained. Then the obtained titanium dioxide sol was aged at room temperature for 60 h to obtain a titanium dioxide gel. Then dry the titanium dioxide gel at 70° C. for 15 hours to obtain a titanium dioxide xerogel. Finally, the obtained xerogel was ground and refined, and sieved with 200 meshes; calcined at 400° C. for 3 hours to obtain iron and fluorine co-doped nano-titanium dioxide visible light photocatalyst. In this embodiment, the molar ratio of the raw materials used is: tetrabutyl titanate: absolute ethanol: water: n...

Embodiment 2

[0036] At room temperature, measure 35.8ml of 1.0M tetrabutyl titanate ethanol solution into the reactor and stir evenly. 0.50 ml of nitric acid (analytical pure, 65-68 wt%) was slowly added dropwise, and the stirring was continued for 30 min. Measure 18ml of 0.0014M ferric chloride and 0.10M ammonium fluoride ethanol solution, add dropwise into the reactor, and stir at room temperature for 30min, hydrolysis reaction occurs, and light yellow titanium dioxide sol is obtained. Then the obtained titanium dioxide sol was aged at room temperature for 60 h to obtain a titanium dioxide gel. Then dry the titanium dioxide gel at 80° C. for 12 hours to obtain a titanium dioxide xerogel. Finally, the obtained xerogel was ground and refined, and sieved with 200 meshes; calcined at 500° C. for 2 hours to obtain iron-fluorine co-doped nano-titanium dioxide visible light photocatalyst. In this embodiment, the molar ratio of the raw materials used is: tetrabutyl titanate: absolute ethanol: ...

Embodiment 3

[0039] At room temperature, measure 45.8ml of 0.8M tetrabutyl titanate ethanol solution into the reactor and stir evenly. 0.25ml of nitric acid (analytical pure, 65-68wt%) was slowly added dropwise, and the stirring was continued for 30 minutes. Measure 18ml of 0.0014M ferric chloride and 0.10M ammonium fluoride ethanol solution, add dropwise into the reactor, and stir at room temperature for 30min, hydrolysis reaction occurs, and light yellow titanium dioxide sol is obtained. Then the obtained titanium dioxide sol was aged at room temperature for 48 hours to obtain a titanium dioxide gel. Then dry the titanium dioxide gel at 70° C. for 15 hours to obtain a titanium dioxide xerogel. Finally, the obtained xerogel was ground and refined, and sieved through a 200-mesh sieve; calcined at 600° C. for 2 hours to obtain a visible-light photocatalyst of nano-titanium dioxide co-doped with iron and fluorine. In this embodiment, the molar ratio of the raw materials used is: tetrabutyl...

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Abstract

The invention relates to a method for preparing a ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst. The method comprises the following steps: (1) at the room temperature, adding nitric acid into the ethanol solution of tetrabutyl titanate dropwise, adding ferrum-fluorine-containing ethanol solution into the mixed solution with stirring, and stirring the mixed solution at the room temperature for 0.5 to 2 hours to perform a hydrolysis reaction to obtain light yellow titanium dioxide sol; (2) ageing the obtained titanium dioxide sol at the room temperature to obtain titanium dioxide gel, and drying the titanium dioxide gel to obtain dried titanium dioxide gel; and (3) grinding, screening and sintering the dried titanium dioxide gel to obtain the ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst. The method has the characteristics of mild reaction conditions, easy control, simple equipment and rich raw material resources, simple synthetic process and high yield, and can be used for large-scale production; and the prepared ferrum-fluorine-codoped nano-titanium dioxide visible light photocatalyst has high performance.

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 iron and fluorine. Background technique [0002] Titanium dioxide is a very important and most promising photocatalytic material. Compared with other semiconductor materials, it has the advantages of good photocatalytic performance, good chemical stability, non-toxicity, and low price. However, titanium dioxide has two obvious shortcomings as a photocatalytic material: on the one hand, titanium dioxide is a wide-bandgap semiconductor with a large band gap (~3.2eV), which can only absorb ultraviolet light with a small wavelength, and the solar energy utilization rate is low. On the other hand, photogenerated electrons and photogenerated holes are very easy to recombine, and the efficiency of photogenerated carriers is low. [0003] The present inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135A62D3/10A62D101/28
Inventor 王宏志张丽玲曹广秀张青红李耀刚
Owner DONGHUA UNIV
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