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Titanium dioxide/graphene/metal elemental ternary composite photocatalytic material and photoreduction preparation method thereof

A photocatalytic material, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of inability to fully utilize the high-efficiency performance of graphene and low cost performance , can not adapt to other problems, to achieve the effect of high-efficiency photolysis of water to produce hydrogen, simple synthesis method, and improved separation efficiency

Active Publication Date: 2019-08-30
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current method of preparing photocatalytic materials by loading metal nanoparticles on titanium dioxide is mainly based on hydrogen high-temperature reduction and strong reducing agent reduction. The reduction method is complicated and costly, and cannot meet the needs of existing industries.
At the same time, although graphene loaded on titanium dioxide can improve the photocatalytic performance to a certain extent, it is not cost-effective and cannot fully exert the high-efficiency performance of graphene.

Method used

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  • Titanium dioxide/graphene/metal elemental ternary composite photocatalytic material and photoreduction preparation method thereof
  • Titanium dioxide/graphene/metal elemental ternary composite photocatalytic material and photoreduction preparation method thereof
  • Titanium dioxide/graphene/metal elemental ternary composite photocatalytic material and photoreduction preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Using isopropanol as a solvent, diethylenetriamine as a template, and isopropyl titanate as a titanium source, sintering at 200°C and 400°C to form flower-shaped porous titanium oxide;

[0043] (2) Take 4mL 2mg / mL graphene oxide in 100mL absolute ethanol and ultrasonically disperse for 30 minutes;

[0044] (3) Add 0.4 g of titanium dioxide obtained in (1) to the solution obtained in (2), and ultrasonically disperse for 10 minutes;

[0045] (4) Place the solution obtained in (3) under light at a wavelength of 365nm for 9h, and continue to stir at a constant speed;

[0046] (5) Add 1.25mL 0.05mol / L copper chloride precursor solution to the solution obtained in (4), continue to irradiate with light with a wavelength of 365nm for 3h, and stir at a constant speed;

[0047](6) Filter the product obtained in (5) to take the filter residue, wash with absolute ethanol and centrifuge, repeat the cleaning and centrifugation process at least three times, and then dry at 60°C t...

Embodiment 2

[0051] (1) Using isopropanol as a solvent, diethylenetriamine as a template, and isopropyl titanate as a titanium source, sintering at 200°C and 400°C to form flower-like porous titanium oxide;

[0052] (2) Take 4mL 2mg / mL graphene oxide in 100mL absolute ethanol and ultrasonically disperse for 30 minutes;

[0053] (3) Add 0.4 g of titanium dioxide obtained in (1) to the solution obtained in (2), and ultrasonically disperse for 10 minutes;

[0054] (4) Place the solution obtained in (3) under light at a wavelength of 365nm for 9h, and continue to stir at a constant speed;

[0055] (5) Add 740 μL of 0.05mol / L silver nitrate precursor solution to the solution obtained in (4), continue to irradiate with light with a wavelength of 365nm for 3h, and stir at a constant speed;

[0056] (6) Filter the product obtained in (5) to take the filter residue, wash with absolute ethanol and centrifuge, repeat the cleaning and centrifugation process at least three times, and then dry at 60°C ...

Embodiment 3

[0060] (1) Using isopropanol as a solvent, diethylenetriamine as a template, and isopropyl titanate as a titanium source, sintering at 200°C and 400°C to form flower-shaped porous titanium oxide;

[0061] (2) Take 4mL 2mg / mL graphene oxide in 100mL absolute ethanol and ultrasonically disperse for 30 minutes;

[0062] (3) Add 0.4 g of titanium dioxide obtained in (1) to the solution obtained in (2), and ultrasonically disperse for 10 minutes;

[0063] (4) Place the solution obtained in (3) under light at a wavelength of 365nm for 9h, and continue to stir at a constant speed;

[0064] (5) Add 400 μL 0.05mol / L chloroauric acid precursor solution to the solution obtained in (4), continue to irradiate with light with a wavelength of 365nm for 3h, and stir at a constant speed;

[0065] (6) Filter the product obtained in (5) to take the filter residue, wash with absolute ethanol and centrifuge, repeat the cleaning and centrifugation process at least three times, and then dry at 60°C...

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Abstract

The invention provides a titanium dioxide / graphene / metal elemental ternary composite photocatalytic material and a photoreduction preparation method thereof. According to the present invention, the titanium dioxide / graphene / metal elemental ternary composite photocatalytic material is a microsphere comprising curved nano-sheets, and has a flower-like hierarchical structure similar to Hydrangea macrophylla, graphene covers the surface of the titanium dioxide microspheres assembled by the curved nano-sheets, and metal nanoparticles are dispersed on the surface of the curved nano-sheets. Accordingto the present invention, the titanium dioxide / graphene / metal elemental ternary composite photocatalytic material is prepared through the photoreduction synthesis method, wherein the synthesis methodis simple, and the cost is low; and the titanium dioxide / graphene / metal elemental ternary composite photocatalytic material can be used in hydrogen production through efficient photodecomposition ofwater.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material synthesis, in particular to a titanium dioxide / graphene / metal simple substance ternary composite photocatalytic material and a photoreduction preparation method. Background technique [0002] Titanium dioxide is an important semiconductor material with unique physical and chemical properties. Titanium dioxide has broad application prospects in photocatalysis, solar cells, lithium-ion batteries and other fields, and has attracted people's attention. Studies have shown that titanium dioxide, as a photocatalyst, plays a very good role in being used to photolyze water to produce hydrogen, purify air, and degrade organic matter. [0003] However, during the reaction process, the recombination of electron-hole pairs severely reduces the photocatalytic efficiency of titanium dioxide, so how to improve the efficiency of electron-hole separation has become an urgent problem to be solved. ...

Claims

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Application Information

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IPC IPC(8): B01J23/72B01J23/50B01J23/52B01J35/08C01B3/04
CPCB01J23/72B01J23/50B01J23/52C01B3/04B01J35/51B01J35/39Y02E60/36
Inventor 李元洲阳晓宇殷义霞胡洁唐宇千何莉陈欣怡
Owner WUHAN UNIV OF TECH
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