Graphene quantum dot composite titanium dioxide nanotube photocatalyst and preparation method thereof

A technology of graphene quantum dots and titanium dioxide, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of spherical products that are easy to agglomerate and affect the specific surface area, raw materials are dangerous and polluting, and the preparation process is complex and other problems, to overcome high toxicity and poor biocompatibility, improve photocatalytic performance, and high catalytic efficiency

Pending Publication Date: 2020-11-03
HANGZHOU NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] The present invention aims to overcome the disadvantages of many preparation steps, complex preparation process, high risk and pollution of raw materials, and easy agglomeration of spherical products to affect the specific surface area in the prior art, and provides a graphene quantum dot composite titanium dioxide nanotube photocatalyst and Its preparation method uses titanium dioxide nanotubes as the catalyst skeleton, has a large effective use area, and avoids the use of relatively dangerous reagents such as hydrogen fluoride, and has high preparation safety, and the preparation process is simple and the conditions are mild.

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  • Graphene quantum dot composite titanium dioxide nanotube photocatalyst and preparation method thereof
  • Graphene quantum dot composite titanium dioxide nanotube photocatalyst and preparation method thereof
  • Graphene quantum dot composite titanium dioxide nanotube photocatalyst and preparation method thereof

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preparation example Construction

[0034] A preparation method of graphene quantum dot composite titanium dioxide nanotube photocatalyst, the preparation method includes the following steps:

[0035] (1) Dissolve 0.4-0.6g glucose in 40ml purified water, stir at room temperature until all is dissolved, then transfer the solution to an autoclave, and conduct a hydrothermal reaction in an oven. Control the reaction temperature at 150-180℃ for reaction 2 -4h, after the reaction kettle is cooled to room temperature, take out the inner lining, centrifuge the brown-yellow liquid after the reaction with a high-speed centrifuge at 8krpm for 20 minutes each to remove the precipitate and save the supernatant. Add sodium borohydride to a concentration of After 15-25g / L, reduce for 4-6h to obtain reduced graphene quantum dots;

[0036] (2) Disperse 1.6g of P25 titanium dioxide powder into 200ml NaOH solution with a concentration of 8-12mol / L, stir and stir magnetically for 1h at room temperature, and then move it to the autoclav...

Embodiment 1

[0039] A graphene quantum dot composite titanium dioxide nanotube photocatalyst, comprising a titanium dioxide nanotube densely covered with several graphene quantum dots on the surface, wherein the average size of the graphene quantum dots is 3-5 nm.

[0040] A preparation method of graphene quantum dot composite titanium dioxide nanotube photocatalyst, the preparation method includes the following steps:

[0041] (1) Dissolve 0.53g glucose in 40ml purified water, stir at room temperature until it is completely dissolved, transfer the solution to the autoclave, conduct a hydrothermal reaction in an oven, control the reaction temperature to react at 160℃ for 3h, wait for the reaction kettle After cooling to room temperature, take out the inner lining, centrifuge the brown-yellow liquid after the reaction in a high-speed centrifuge at a speed of 8krpm for 20 minutes each to remove the precipitate and save the supernatant. Add sodium borohydride to a concentration of 20g / L and then re...

Embodiment 2

[0048] A graphene quantum dot composite titanium dioxide nanotube photocatalyst, comprising a titanium dioxide nanotube densely covered with several graphene quantum dots on the surface, wherein the average size of the graphene quantum dots is 3-5 nm.

[0049] A preparation method of graphene quantum dot composite titanium dioxide nanotube photocatalyst, the preparation method includes the following steps:

[0050] (1) Dissolve 0.4g glucose in 40ml purified water, stir at room temperature until it is completely dissolved, transfer the solution to the autoclave, conduct a hydrothermal reaction in an oven, control the reaction temperature at 180°C for 2h, wait for the reaction kettle After cooling to room temperature, take out the inner lining. Centrifuge the brown-yellow liquid after the reaction in a high-speed centrifuge at 8krpm for 20 minutes each to remove the precipitate and save the supernatant. Add sodium borohydride to a concentration of 15g / L and reduce for 6h To obtain re...

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Abstract

The invention relates to the technical field of inorganic nano catalysts, in particular to a graphene quantum dot composite titanium dioxide nanotube photocatalyst, which comprises a titanium dioxidenanotube with a plurality of densely distributed graphene quantum dots on the surface, the average size of the graphene quantum dots being 35 nm, and a preparation method of the graphene quantum dot composite titanium dioxide nanotube photocatalyst. The preparation method comprises preparation of reduced graphene quantum dots, preparation of titanium dioxide nanotubes and preparation of the graphene quantum dot composite titanium dioxide nanotube photocatalyst. According to the preparation method, the titanium dioxide nanotubes are used as a titanium dioxide skeleton, are relatively high in rigidity and are not easy to agglomerate, also have very large specific surface area and effective area, and are compounded after redundant carbonyl groups and other groups on the surfaces of the graphene quantum dots are reduced in the preparation process, so that photocatalytic active sites are effectively exposed, and very high catalytic efficiency is achieved; in addition, the method is high inreaction efficiency, simple in process, few in steps, low in cost, good in safety and suitable for large-scale production.

Description

Technical field [0001] The invention relates to the technical field of inorganic nano catalysts, in particular to a graphene quantum dot composite titanium dioxide nanotube photocatalyst and a preparation method thereof. Background technique [0002] With the development of industry, environmental protection problems caused by environmental pollution have become social issues of widespread concern. It is generally believed that hydrogen may be the best choice to solve the three major problems of energy depletion, pollution and climate change. Nowadays, photocatalysis of water is considered to be one of the most promising methods for hydrogen production, and photocatalysis technology is an efficient and safe environment-friendly environmental purification technology. [0003] Many photocatalysts have been reported to catalyze the evolution of hydrogen from aqueous solutions. Among these photocatalysts, TiO 2 Because of its excellent photocatalytic performance, easy availability, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18B01J35/00C01B3/04
CPCB01J21/063B01J21/18B01J35/004C01B3/042Y02E60/36
Inventor 高鹏池倩倩陈钰慧李笑宇
Owner HANGZHOU NORMAL UNIVERSITY
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