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Preparation method of graphene/titanium dioxide photocatalyst

A technology of titanium dioxide and photocatalyst, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as difficult dispersion, achieve the effects of avoiding agglomeration, easy implementation, and wide application

Inactive Publication Date: 2014-07-30
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although graphene oxide has good dispersibility in aqueous solution, when graphene oxide is reduced to graphene in the preparation process of composite materials, due to the strong hydrophobicity of graphene, the obtained graphene / titania light Catalyst agglomeration is serious, not easy to disperse

Method used

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  • Preparation method of graphene/titanium dioxide photocatalyst
  • Preparation method of graphene/titanium dioxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of graphene / titanium dioxide photocatalyst, comprises the steps:

[0028] (1) To prepare solution A, slowly add 0.07 g of tetrabutyl titanate to 40 mL of chloroform at a concentration of 1.75 g / L; to prepare solution B, add 0.024 g of graphene oxide prepared by the Hummers method to 40 mL In the mixture of deionized water and ethanol, the concentration of graphene oxide was 0.6 g / L. The obtained mixed solution B was added dropwise into the solution A while stirring, and stirred evenly to obtain a mixed solution of A and B.

[0029] (2) Put the mixed solution of A and B into a hydrothermal kettle and keep it warm at 180°C for 12 hours; after natural cooling to room temperature, separate and wash to obtain a graphene / titanium dioxide photocatalyst with excellent photocatalytic performance.

[0030] Through transmission electron microscopy analysis, it can be seen that titanium dioxide nanoparticles are dispersed on graphene sheets, such as f...

Embodiment 2

[0032] A kind of preparation method of graphene / titanium dioxide photocatalyst, comprises the steps:

[0033] (1) To prepare solution A, slowly add 0.17 g of tetrabutyl titanate to 40 mL of chloroform at a concentration of 4.2 g / L; to prepare mixed solution B, add 0.008 g of graphene oxide prepared by the Hummers method to 40 mL In the mixed solution of deionized water and ethanol, the concentration of graphene oxide was 0.02 g / L. Add the mixed solution B dropwise to the solution A while stirring, and continue to stir and mix evenly to obtain a mixed solution of A and B.

[0034] (2) Put the mixed solution of A and B into a hydrothermal kettle and keep it warm at 160°C for 20 hours; after natural cooling to room temperature, separate and wash to obtain a graphene / titanium dioxide photocatalyst with excellent photocatalytic performance.

Embodiment 3

[0036] A kind of preparation method of graphene / titanium dioxide photocatalyst, comprises the steps:

[0037] (1) To prepare solution A, slowly add 0.034 g of tetrabutyl titanate to 40 mL of chloroform at a concentration of 0.85 g / L; to prepare mixed solution B, add 0.032 g of graphene oxide prepared by the Hummers method to 40 mL In the mixed solution of deionized water and ethanol, the concentration of graphene oxide was 0.8 g / L. The obtained mixed solution B was added dropwise into the solution A while stirring, and stirred evenly to obtain a mixed solution of A and B.

[0038] (2) Put the mixed solution of A and B into a hydrothermal kettle and keep it warm at 200°C for 5 hours; after natural cooling to room temperature, separate and wash to obtain a graphene / titanium dioxide photocatalyst with excellent photocatalytic performance.

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Abstract

The invention discloses a preparation method of graphene / titanium dioxide photocatalyst. The steps are as follows: (1) preparing solution A: slowly adding tetrabutyl titanate into chloroform to obtain solution A; (2) preparing mixed solution B: Add graphene oxide into the mixed solution of deionized water and ethanol to obtain mixed solution B; (3) add mixed solution B dropwise to solution A while stirring, and stir evenly to obtain mixed solution; (4) mix The liquid is put into a hydrothermal kettle, after being hydrothermally cooled to room temperature naturally, separated and washed to obtain a graphene / titanium dioxide photocatalyst. The graphene / titanium dioxide photocatalyst prepared by the method has excellent photocatalytic degradation performance for organic dyes.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis of photocatalytic functional materials, in particular to a method for preparing a graphene / titanium dioxide photocatalyst. Background technique [0002] Graphene has attracted extensive attention of researchers due to its excellent optical and electrical properties. It can be used as a performance-enhancing phase to compound with other nano-semiconductor materials to prepare composite materials with excellent performance. By combining graphene with semiconductor nanomaterials, when the material is irradiated by light, photogenerated electrons can be transferred from semiconductor particles to graphene, effectively preventing the recombination of photogenerated electrons and holes, improving the lifetime of photogenerated electrons and holes, thereby improving Photocatalytic efficiency, significantly improving the performance of photocatalytic materials. This composite material has po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18C02F1/30C02F1/32
CPCY02W10/37
Inventor 蒲锡鹏张大凤李文智邵鑫高岩岩刘建秀
Owner LIAOCHENG UNIV
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