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Titanium dioxide nano-sheet photocatalyst as well as preparation method and application thereof

A photocatalyst, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, etc., to achieve the effect of high ammonia yield, easy mass production, and excellent performance

Active Publication Date: 2018-11-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no literature report on the application of carbon dioxide in the catalytic synthesis of ammonia.

Method used

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  • Titanium dioxide nano-sheet photocatalyst as well as preparation method and application thereof
  • Titanium dioxide nano-sheet photocatalyst as well as preparation method and application thereof
  • Titanium dioxide nano-sheet photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0044] In order to obtain a titanium dioxide nanosheet photocatalyst with a high catalytic activity site, the invention provides a preparation method for a titanium dioxide nanosheet photocatalyst, the preparation method comprising the following steps:

[0045] Under anhydrous conditions, mix copper salt, titanium source and absolute ethanol to obtain solution A, and mix solution A with acid to obtain solution B; the solution B is crystallized, washed and dried to obtain titanium dioxide nanosheet light catalyst. In the present invention, copper atoms are introduced into the precursor solution so that the copper atoms enter the titanium dioxide unit cells, so that the titanium dioxide nano sheet photocatalyst produces more catalytic active sites. The preparation process of the present invention requires the whole process to be carried out under anhydrous conditions. The main reason is that copper atoms in the precursor will generate new copper oxides during the crystallization...

Embodiment 1

[0063] A preparation method of titanium dioxide nanosheet photocatalyst, comprising the steps of:

[0064] 1) Preparation of mixed metal precursor solution: Dissolve 0.293mmol copper chloride trihydrate and 29.3mmol tetrabutyl titanate in 40ml absolute ethanol, add 40.3mmol hydrofluoric acid, fully disperse and evenly obtain a uniform solution;

[0065] 2) The homogeneous solution obtained in step 1) was placed in a blast drying oven and crystallized at 100°C for 18 hours to obtain the product, which was named 1%-TiO 2 ;

[0066] 3) step 2) to obtain the product 1%-TiO 2 After washing with deionized water for 4 times, drying at 70° C. for 16 hours, and grinding to obtain titanium dioxide nanosheets, which are titanium dioxide nanosheet photocatalysts.

[0067] The titanium dioxide nanosheet photocatalyst prepared above is used for photocatalytic synthesis of ammonia, comprising the following steps:

[0068] Add 10 mg of titanium dioxide nanosheet photocatalyst and 15 mL of ...

Embodiment 2

[0076] A preparation method of titanium dioxide nanosheet photocatalyst, comprising the steps of:

[0077] 1) Preparation of mixed metal precursor solution: Dissolve 0.879 mmol of copper nitrate trihydrate and 29.3 mmol of tetraisopropyl titanate in 40 ml of absolute ethanol, add 60 mmol of hydrofluoric acid, fully disperse and evenly obtain a uniform solution;

[0078] 2) The homogeneous solution obtained in step 1) was placed in a blast drying oven and crystallized at 120°C for 24 hours to obtain the product, which was named 3%-TiO 2 ;

[0079] 3) step 2) to obtain the product 3%-TiO 2 After washing with deionized water for 4 times, drying at 80° C. for 24 hours, and grinding to obtain titanium dioxide nanosheets, that is, titanium dioxide nanosheet photocatalysts.

[0080] The titanium dioxide nanosheet photocatalyst prepared above is used for photocatalytic synthesis of ammonia, comprising the following steps: adding titanium dioxide nanosheet photocatalyst 100mg and 50m...

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Abstract

The invention discloses a preparation method and application of a titanium dioxide nano-sheet photocatalyst. The preparation method of the titanium dioxide nano-sheet photocatalyst comprises the following steps: under an anhydrous condition, uniformly mixing copper salt, a titanium source and absolute ethyl alcohol to obtain a solution A; uniformly mixing the solution A and acid to obtain a solution B; crystallizing, washing and drying the solution B to obtain the titanium dioxide nano-sheet photocatalyst. The invention further provides the titanium dioxide nano-sheet photocatalyst prepared bythe preparation method and the application of the titanium dioxide nano-sheet photocatalyst to photocatalytic ammonia synthesis. According to the preparation method, copper ions are introduced into aprecursor solution and the copper ions enter titanium dioxide structure cells, so that the titanium dioxide nano-sheet photocatalyst has more catalytic activity sites. The titanium dioxide nano-sheetphotocatalyst prepared by the preparation method has excellent performance in reaction of photocatalytically synthesizing ammonia; the high-yield ammonia is prepared by adopting the titanium dioxidenano-sheet photocatalyst for the first time.

Description

technical field [0001] The invention relates to the technical field of photocatalysts. More specifically, it relates to a titanium dioxide nanosheet photocatalyst and its preparation method and application. Background technique [0002] Ammonia is one of the important inorganic chemical products, and the synthetic ammonia industry occupies an important position in the national economy. Except that liquid ammonia can be directly used as fertilizer, nitrogen fertilizers used in agriculture, such as urea, ammonium nitrate, ammonium phosphate, ammonium chloride and various nitrogen-containing compound fertilizers, all use ammonia as raw material. Synthetic ammonia is one of the bulk chemical products. The world's annual synthetic ammonia output has reached more than 100 million tons, of which about 80% ammonia is used for chemical fertilizers, and 20% is used as raw materials for other chemical products. At the same time, all living organisms require nitrogen to build proteins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C01C1/04C01G23/07B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01C1/0411C01G23/075B01J23/72C01P2004/20B01J35/39Y02P20/52
Inventor 张铁锐赵运宣赵宇飞施润
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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