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Photocatalyst of N-doped graphene compound semiconductor nano particles and preparation method thereof

A nanoparticle, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problems of loss, reduction of catalytic activity, etc., to prevent aggregation and loss, improve photocatalyst life, The effect of improving the separation efficiency of photogenerated charges

Inactive Publication Date: 2014-01-22
SUZHOU UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, noble metal nanoparticles tend to accumulate or lose on the surface of the catalyst during the catalytic reaction, resulting in a decrease in catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The photocatalyst preparation method of the present invention may include the following steps:

[0023] (1) Preparation of nitrogen-doped graphite

[0024] Nitrogen-doped graphite is prepared by thermo-solid phase reaction. After the graphite oxide and urea are thoroughly mixed and ground, they are loaded into a quartz boat and placed in a tube furnace. Argon gas was passed for 30 minutes before heating to remove the air in the tube furnace. Tube furnace at 5℃·min -1 The temperature is increased to the set temperature at a rate of, and after reacting at this temperature for 2-6 hours, the heating is stopped, and the furnace temperature is lowered to room temperature in an argon atmosphere. The sample was washed repeatedly with 1M hydrochloric acid and deionized water to remove impurities adsorbed on the surface of the sample. After the solid was dried at 60°C, nitrogen-doped graphite powder was obtained.

[0025] Among them, GO is prepared by Hummers method.

[0026] The rati...

Embodiment 1

[0038] The Hummers method was used to prepare GO. Add 23mL of concentrated sulfuric acid (98%) into a 250mL flask. After cooling to 0℃ with an ice-water bath, slowly add 1g graphite powder and 3g KMnO under magnetic stirring. 4 , KMnO 4 The addition rate of the solution is controlled so that the temperature of the reaction solution can be maintained between 10-15°C. After the addition, the stirring reaction is continued for 2h. The flask was then placed in a constant temperature water bath at 35° C. and reacted for another 30 minutes. After cooling to room temperature, slowly add the reaction mixture to 50mL of deionized water. After stirring for 15min at 90~95℃, add 140mL of deionized water and 10mL of 30vol%H to the reaction solution. 2 O 2 After stirring the aqueous solution evenly, it is filtered while it is hot. The filter cake is washed thoroughly with 5% HCl and deionized water, and then vacuum dried at 40°C for use.

[0039] 1g of GO and 3g of urea were thoroughly mixed a...

Embodiment 2

[0044] The Hummers method was used to prepare GO. Add 23mL of concentrated sulfuric acid (98%) into a 250mL flask. After cooling to 0℃ with an ice-water bath, slowly add 1g graphite powder and 3g KMnO under magnetic stirring. 4 , KMnO 4 The addition rate of the solution is controlled so that the temperature of the reaction solution can be maintained between 10-15°C. After the addition, the stirring reaction is continued for 2h. The flask was then placed in a constant temperature water bath at 35° C. and reacted for another 30 minutes. After cooling to room temperature, slowly add the reaction mixture to 50mL of deionized water. After stirring for 15min at 90~95℃, add 140mL of deionized water and 10mL of 30vol%H to the reaction solution. 2 O 2 After stirring the aqueous solution evenly, it is filtered while it is hot. The filter cake is washed thoroughly with 5% HCl and deionized water, and then vacuum dried at 40°C for use.

[0045] 1g of GO and 3g of urea were thoroughly mixed a...

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Abstract

The invention discloses a catalyst of semiconductor nano particles / N-doped graphene compound, and a preparation method thereof, and the catalyst is used for decomposing water in a photocatalysis mode. NGR is used as a carrier, tetrabutyl titanate is used as the raw material, TiO2 nano particles are loaded on the surface of the NGR in a solvothermal method, after cleaning and drying, TiO2 / NGR compounds with the TiO2 nano particles evenly distributed on the two-dimensional plane of the NGR are obtained, a few of Pt nano particles are loaded on the TiO2 / NGR compounds in a photo-deposition method, and the TiO2 / NGR / Pt three-component photocatalyst is obtained. Compared with a compound prepared by pure TiO2 nano particles or reduction-oxidation graphene and TiO2 nano particles, the photocatalyst prepared in the novel method has the advantages that the partical size of each TiO2 nano particle is small, distribution is even, catalytic activity is high, stability is good, and using cycle is long.

Description

Technical field [0001] The invention belongs to the technical field of photo-functional catalytic materials, and relates to a catalyst for photocatalytic water splitting to produce hydrogen and a preparation method thereof, and in particular to a nitrogen-doped graphene (abbreviated as NGR) for photocatalytic water splitting to produce hydrogen. ) Photocatalyst of composite semiconductor nanoparticles and preparation method thereof. Background technique [0002] As the world’s population continues to increase and the level of industrialization increases, the scale of human use of fossil energy such as coal, oil, and natural gas is increasing. Extensive mining and use of mineral energy has made non-renewable mineral energy depleted day by day, and the global environment is also deteriorating. The development of new and renewable clean energy has become a major issue related to human survival and sustainable development. Hydrogen has the characteristics of clean, high efficiency,...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCY02E60/36
Inventor 杨平牟志刚吴毅杰王林杜玉扣
Owner SUZHOU UNIV
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