Two-dimensional titanium dioxide nanosheet catalytic material and preparation method thereof

A photocatalytic material, titanium dioxide technology, applied in the field of photocatalysis, can solve the problems of low catalytic activity and low stability, achieve environmental friendliness, simple and mild preparation process, and improve the photocatalytic hydrogen production performance

Inactive Publication Date: 2019-07-16
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: existing TiO 2 The technical problems of low catalytic activity and low stability of photocatalytic materials

Method used

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  • Two-dimensional titanium dioxide nanosheet catalytic material and preparation method thereof
  • Two-dimensional titanium dioxide nanosheet catalytic material and preparation method thereof
  • Two-dimensional titanium dioxide nanosheet catalytic material and preparation method thereof

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Effect test

Embodiment 1

[0035] A preparation method of a two-dimensional titanium dioxide nanosheet photocatalytic material:

[0036] 1) 100 mg of graphene oxide was added to 200 mL of absolute ethanol, the control power was 400 W, and the frequency was 32 kHz for 30 minutes of ultrasonic treatment, so that the graphene oxide was evenly dispersed in the absolute ethanol solution to obtain a graphene dispersion solution;

[0037] 2) Add 2.47mmol of tetrabutyl titanate to the graphene dispersion solution in step 1), and stir for 15 hours at a controlled temperature of 20°C and a rotation speed of 600r / min to obtain a mixed solution. The purpose is to use the template method Make tetrabutyl titanate evenly adsorbed on the graphene oxide template;

[0038] 3) Centrifuge the mixed solution obtained in step 2) at a controlled speed of 10000r / min for 15min, wash the obtained precipitate with absolute ethanol until there is no tetrabutyl titanate in the effluent, and then centrifuge again at a controlled spe...

Embodiment 2

[0044] A preparation method of a two-dimensional titanium dioxide nanosheet photocatalytic material:

[0045] 1) Add 100 mg of graphene oxide to 200 mL of absolute ethanol, control the power to 400 W, and perform ultrasonic treatment at a frequency of 32 kHz for 30 minutes, so that the graphene oxide is evenly dispersed in the absolute ethanol solution to obtain a graphene dispersion solution;

[0046] 2) Add 2.47mmol of tetrabutyl titanate to the graphene dispersion solution in step 1), and stir for 15 hours at a controlled temperature of 20°C and a rotation speed of 600r / min to obtain a mixed solution. The purpose is to use the template method Make tetrabutyl titanate evenly adsorbed on the graphene oxide template;

[0047]3) Centrifuge the mixed solution obtained in step 2) at a controlled speed of 10000r / min for 15min, wash the obtained precipitate with absolute ethanol until there is no tetrabutyl titanate in the effluent, and then centrifuge again at a controlled speed o...

Embodiment 3

[0053] A preparation method of a two-dimensional titanium dioxide nanosheet photocatalytic material:

[0054] 1) 100 mg of graphene oxide was added to 200 mL of absolute ethanol, the control power was 400 W, and the frequency was 32 kHz for 30 minutes of ultrasonic treatment, so that the graphene oxide was evenly dispersed in the absolute ethanol solution to obtain a graphene dispersion solution;

[0055] 2) Add 2.47mmol of tetrabutyl titanate to the graphene dispersion solution in step 1), and stir for 15 hours at a controlled temperature of 20°C and a rotation speed of 600r / min to obtain a mixed solution. The purpose is to use the template method Make tetrabutyl titanate evenly adsorbed on the graphene oxide template;

[0056] 3) Centrifuge the mixed solution obtained in step 2) at a controlled speed of 10000r / min for 15min, wash the obtained precipitate with absolute ethanol until there is no tetrabutyl titanate in the effluent, and then centrifuge again at a controlled spe...

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Abstract

The invention discloses a two-dimensional titanium dioxide nanosheet catalytic material and a preparation method thereof. The thickness of the two-dimensional titanium dioxide nanosheet catalytic material is 3-10 nm, and the length of the two-dimensional titanium dioxide nanosheet catalytic material is 10-50 microns. The preparation method comprises the following steps: adding graphene oxide intoabsolute ethyl alcohol, and uniformly carrying out dispersing to obtain a graphene dispersion solution; adding tetrabutyl titanate into the graphene dispersion solution, and uniformly carrying out stirring; carrying out centrifuging, washing and drying on the mixed solution; and calcining the product to obtain an unmodified titanium dioxide nanosheet, adding the unmodified titanium dioxide nanosheet and ascorbic acid into deionized water, uniformly carrying out stirring, carrying out heating and reacting to obtain a brown initial product, and calcining the brown initial product to obtain the titanium dioxide nanosheet photocatalytic material. According to the method, firstly, ultra-thin two-dimensional TiO2 is prepared through a GO template method, and then reduction modification is carried out on the ultrathin two-dimensional TiO2 through the ascorbic acid, so that defects are introduced, and photocatalytic performance of the ultra-thin two-dimensional TiO2 is improved, namely, performance of hydrogen production by water photolysis of the ultra-thin two-dimensional TiO2 is greatly improved through great modification of the ultra-thin two-dimensional TiO2.

Description

technical field [0001] The invention relates to a modified flaky nano-titanium dioxide photocatalytic material and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] With the continuous improvement of people's living standards, non-renewable natural resources such as oil, coal and natural gas are increasingly consumed by humans. At the same time, products may have negative impacts on the environment during the extraction, transportation and transformation of raw materials. Therefore, the phenomenon of energy shortage and environmental pollution has become a worldwide problem that human beings are currently dealing with. In terms of solving the energy crisis, the efficient use of renewable energy has been realized through photo-splitting of water to produce hydrogen and solar cells. The role of semiconductor photocatalytic technology in the field of environmental restoration cannot be ignored, and it has been prov...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/02
CPCB01J21/063B01J35/40B01J35/39
Inventor 王丁杨家林田梁鲍丽萍王峰李慧珺王现英
Owner UNIV OF SHANGHAI FOR SCI & TECH
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