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Method for preparing graphene-titanium dioxide composite photocatalyst

A technology of titanium dioxide and graphene, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of low activity, achieve the effect of improving hydrogen production activity and inhibiting recombination

Inactive Publication Date: 2018-04-13
SHAANXI JUJIEHAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of photocatalytic hydrogen production is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of graphene-titanium dioxide composite photocatalyst comprises the following steps:

[0020] (1) Combine graphite powder and NaNO 3 Mix, react in microwave for 20min at a power of 100W, and cool naturally to room temperature;

[0021] (2) Add the mixture obtained in step (1) to concentrated sulfuric acid in an ice-water bath, stir and mix, and then add KMnO 4 , stirred at 3000r / min for 20min, wherein, in step (1) and step (2), graphite powder, NaNO 3 , concentrated sulfuric acid, KMnO 4 The addition ratio is 1g:1g:23mL:3g;

[0022] (3) Put the system in step (2) in an oil bath at 35°C for 30 minutes to react, then add a hydrogen peroxide solution with a mass concentration of 30% until no bubbles are generated in the system, wash the precipitate until the pH of the filtrate is 7, and then Dry at 50°C for 3 hours to obtain graphite oxide;

[0023] (4) Add the graphite oxide obtained in step (3) into the mixed solution of ethanol and water accor...

Embodiment 2

[0026] The preparation method of graphene-titanium dioxide composite photocatalyst comprises the following steps:

[0027] (1) Combine graphite powder and NaNO 3 Mix, react in microwave for 30min at a power of 200W, and cool naturally to room temperature;

[0028] (2) Add the mixture obtained in step (1) to concentrated sulfuric acid in an ice-water bath, stir and mix, and then add KMnO 4 , stirred at 3000r / min for 20min, wherein, in step (1) and step (2), graphite powder, NaNO 3 , concentrated sulfuric acid, KMnO 4 The addition ratio is 1g:1g:23mL:3g;

[0029] (3) Put the system in step (2) in an oil bath at 35°C for 50 minutes, then add a hydrogen peroxide solution with a mass concentration of 30% until no bubbles are generated in the system, wash the precipitate until the pH of the filtrate is 7, and then Dry at 50°C for 4 hours to obtain graphite oxide;

[0030] (4) Add the graphite oxide obtained in step (3) into the mixed solution of ethanol and water according to t...

Embodiment 3

[0033] The preparation method of graphene-titanium dioxide composite photocatalyst comprises the following steps:

[0034] (1) Combine graphite powder and NaNO 3 Mix, react in microwave for 30min at a power of 100W, and cool naturally to room temperature;

[0035] (2) Add the mixture obtained in step (1) to concentrated sulfuric acid in an ice-water bath, stir and mix, and then add KMnO 4 , stirred at 3000r / min for 20min, wherein, in step (1) and step (2), graphite powder, NaNO 3 , concentrated sulfuric acid, KMnO 4 The addition ratio is 1g:1g:23mL:3g;

[0036] (3) Put the system in step (2) in an oil bath at 35°C for 40 minutes to react, then add a hydrogen peroxide solution with a mass concentration of 30% until no bubbles are generated in the system, wash the precipitate until the pH of the filtrate is 7, and then Dry at 50°C for 3.5h to obtain graphite oxide;

[0037] (4) Add the graphite oxide obtained in step (3) into the mixed solution of ethanol and water accordin...

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Abstract

The invention discloses a method for preparing a graphene-titanium dioxide composite photocatalyst. The method comprises the following steps: 1, mixing graphite powder with NaNO3, carrying out a microwave reaction, and naturally cooling the obtained reaction product to room temperature; 2, adding a mixture obtained in step 1 into concentrated sulfuric acid in an ice water bath state, stirring andmixing the mixture and the concentrated sulfuric acid, and adding KMnO4; 3, placing a system obtained in step 2 in an oil bath, adding a hydrogen peroxide solution until the system generates no bubbles, washing the obtained precipitate, and carrying out vacuum drying on the precipitate to obtain graphite oxide; 4, adding the graphite oxide into an ethanol and water mixed solution, and carrying outultrasonic treatment; and 5, adding titanium dioxide, carrying out a stirring reaction at 150 DEG C, naturally cooling the obtained reaction product to room temperature, filtering the cooled product,washing the obtained precipitate, and carrying out vacuum drying to obtain the graphene-titanium dioxide composite photocatalyst. The graphene-titanium dioxide composite photocatalyst is prepared through a hydrothermal technology, and the hydrogen generation activity of the photocatalyst is high.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a graphene-titania composite photocatalyst. Background technique [0002] TiO 2 As an important inorganic semiconductor material, its rapid development and wide application in energy and environment have attracted the attention of more and more researchers. Catalyst, but due to its large energy band gap (3.2eV), it can only respond to ultraviolet light. At the same time, photogenerated electron-hole pairs are easy to recombine, and the photon quantum efficiency is low, which greatly limits the scope of application in practice. Researchers have made various attempts to modify it, such as ion doping, noble metal deposition, semiconductor recombination, etc. [0003] In recent years, the discovery and application of graphene is TiO 2 The modification of TiO has created conditions, and researchers have used its excellent electron tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01B3/04C01B3/22
CPCC01B3/042C01B3/22B01J21/063C01B2203/1041C01B2203/1082C01B2203/1229B01J35/39Y02E60/36
Inventor 李长英
Owner SHAANXI JUJIEHAN CHEM CO LTD
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