Method for preparing nitrogen doped titanium dioxide with high-energy crystal surface on surface

A titanium dioxide and nitrogen doping technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of low electron-hole pair separation efficiency, narrow light absorption range, and unsatisfactory effects, etc. problems, to achieve the effect of active chemical properties, good repeatability and short production cycle

Inactive Publication Date: 2019-05-14
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiO 2 The utilization of solar energy is facing great challenges, mainly due to the narrow light absorption range and the low separation efficiency of electron-hole pairs.
Although people have adopted a large number of methods including dye sensitization, noble metal deposition, semiconductor recombination, metal ion and non-metal ion doping, etc. to treat TiO 2 Modified, but the effect is still not ideal
[0004] Compared with cation doping, anion doping has certain advantages, and the former reduces the quantum yield due to the generation of a large number of harmful recombination centers of photogenerated electrons and holes.

Method used

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  • Method for preparing nitrogen doped titanium dioxide with high-energy crystal surface on surface
  • Method for preparing nitrogen doped titanium dioxide with high-energy crystal surface on surface
  • Method for preparing nitrogen doped titanium dioxide with high-energy crystal surface on surface

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Accurately add 50ml of ethanol to a 100ml beaker, then weigh 1mmol of urea and dissolve it in ethanol, place the beaker on a magnetic stirrer and stir continuously, add 3mmol of titanium tetrachloride dropwise in a fume hood, and wait until the titanium tetrachloride solution is completely After dispersion in ethanol, a pale yellow solution was obtained at this point.

[0036] Then add 3mmol titanium tetrafluoride to the beaker, stir well for 15 minutes, transfer the resulting suspension into a 100ml autoclave, and react at 180°C for 12 hours. After cooling to room temperature, use 40ml of the obtained solid powder Wash 3 times with absolute ethanol, then wash 3 times with 40ml distilled water, and then wash 2 times with 40ml absolute ethanol. A khaki solid powder was finally obtained, which was then collected by centrifugation, dried at 60°C for 12 hours, and the dried product was taken out, then placed in a muffle furnace and roasted at 200°C for 1 hour, and then grou...

Embodiment 2

[0042] Accurately add 50ml of ethanol to a 100ml beaker, then weigh 6mmol of urea and dissolve it in ethanol, place the beaker on a magnetic stirrer and stir continuously, add 3mmol of titanium tetrachloride dropwise in a fume hood, and wait until the titanium tetrachloride solution is completely After dispersion in ethanol, a pale yellow solution was obtained at this point.

[0043]Then add 3mmol titanium tetrafluoride to the beaker, stir well for 15 minutes, transfer the resulting suspension into a 100ml autoclave, and react at 180°C for 12 hours. After cooling to room temperature, use 40ml of the obtained solid powder Wash 3 times with absolute ethanol, then wash 3 times with 40ml distilled water, and then wash 2 times with 40ml absolute ethanol. A khaki solid powder was finally obtained, which was then collected by centrifugation, dried at 60°C for 12 hours, and the dried product was taken out, then placed in a muffle furnace and roasted at 180°C for 1 hour, and then groun...

Embodiment 3

[0046] Accurately add 50ml of ethanol to a 100ml beaker, then weigh 1mmol of urea and dissolve it in ethanol, place the beaker on a magnetic stirrer and stir continuously, add 3mmol of titanium tetrachloride dropwise in a fume hood, and wait until the titanium tetrachloride solution is completely After dispersion in ethanol, a pale yellow solution was obtained at this point.

[0047] Then add 3mmol titanium tetrafluoride to the beaker, stir well for 15 minutes, transfer the resulting suspension into a 100ml autoclave, and react at 180°C for 12 hours. After cooling to room temperature, use 40ml of the obtained solid powder Wash 3 times with absolute ethanol, then wash 3 times with 40ml distilled water, and then wash 2 times with 40ml absolute ethanol. A khaki solid powder was finally obtained, which was then collected by centrifugation, dried at 60°C for 12 hours, and the dried product was taken out, then placed in a muffle furnace and roasted at 300°C for 1 hour, then ground t...

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Abstract

The invention relates to a method for preparing nitrogen doped titanium dioxide with a high-energy crystal surface on a surface. The method comprises the following steps: 1) dissolving urea into an alcohol solvent, dispersing titanium tetrachloride and titanium tetrafluoride into the alcohol solvent, and carrying out a hydrothermal reaction on a turbid liquid at 140-220 DEG C so as to obtain a solid product; and (2) calcining the solid product at 180-300 DEG C, thereby obtaining the nitrogen doped titanium dioxide with the high-energy crystal surface on the surface. The nitrogen doped titaniumdioxide with the high-energy crystal surface on the surface, which is prepared by using the method, has excellent visible catalysis properties.

Description

technical field [0001] The invention relates to the field of preparation of titanium dioxide, in particular to a preparation method of nitrogen-doped titanium dioxide with high-energy crystal faces on the surface. Background technique [0002] Semiconductor photocatalytic materials play an important role in combating environmental pollution and energy shortages, and how to prepare highly efficient visible light-responsive semiconductor photocatalysts is the key. [0003] TiO 2 It is the first reported photocatalyst and the most widely used photocatalyst. It is cheap, non-toxic, and can be used for a long time. It is one of the most successful photocatalysts. However, TiO 2 The utilization of solar energy is facing great challenges, mainly due to the narrow light absorption range and low separation efficiency of electron-hole pairs. Although people have adopted a large number of methods including dye sensitization, noble metal deposition, semiconductor recombination, metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 王惠钢徐宁
Owner ZHEJIANG SCI-TECH UNIV
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