A kind of gold nanoparticle/titanium dioxide nanoflower composite material and its preparation method and application

A technology of gold nanoparticles and titanium dioxide, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of narrow light absorption range and severe recombination, and achieve the effects of simple preparation process, low production cost and excellent photocatalytic hydrogen production performance

Active Publication Date: 2020-04-24
ZHEJIANG UNIV CITY COLLEGE
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to address the above problems, to provide a method for preparing a new type of composite material by using titanium dioxide oxygen vacancies with reductive one-step deposition of gold nanoparticles, which solves the serious internal recombination of titanium dioxide photogenerated carriers and the narrow light absorption range in the prior art And other issues

Method used

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  • A kind of gold nanoparticle/titanium dioxide nanoflower composite material and its preparation method and application
  • A kind of gold nanoparticle/titanium dioxide nanoflower composite material and its preparation method and application
  • A kind of gold nanoparticle/titanium dioxide nanoflower composite material and its preparation method and application

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Experimental program
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Embodiment 1

[0019] Step 1: Add 0.025 mL of diethylenetriamine (EDTA) to 31.5 mL of isopropanol, and stir for 10 min. Then, 1.125 mL of diisopropyl di(acetylacetonato)titanate was added to the solution. Stirring was continued for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 200° C. for 24 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol respectively, placed in an oven at 60°C, and dried for 24 hours. Finally, the reactant was placed in a muffle furnace with a heating rate of 1°C / min and a temperature of 425°C. Annealed for 2 hours to obtain the precursor titania nanoflower material.

[0020] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 mL of deionized water, and add 0.21 mL of chloroauric acid solution containing 2.1 mg of chloroauric acid. Keep the temperature of the solution water bath at 80° C., and the reaction time is...

Embodiment 2

[0025] Step 1: Add 0.025 mL of diethylenetriamine (EDTA) to 31.5 mL of isopropanol, and stir for 10 min. Then, 1.125 mL of diisopropyl di(acetylacetonato)titanate was added to the solution. Stirring was continued for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 200° C. for 24 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol, placed in an oven at 60°C, dried for 24 hours, and finally placed in a muffle furnace with a heating rate of 1°C / min and annealed at 425°C After 2 hours, the precursor titania nanoflower material was obtained.

[0026] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 mL of deionized water, and add 0.42 mL of chloroauric acid solution containing 4.2 mg of chloroauric acid. Keep the temperature of the solution water bath at 100° C., and the reaction time is 5 hours. After the reaction, the prec...

Embodiment 3

[0030] Step 1: Add 0.125 mL of diethylenetriamine (EDTA) to 31.5 mL of isopropanol, and stir for 10 min. Then, 4.5 mL of diisopropyl di(acetylacetonato)titanate was added to the solution. Stirring was continued for 10 min. The resulting mixed solution was poured into a reaction kettle, and subjected to solvent heat treatment at 220° C. for 36 hours. After the reaction, the precipitate was washed three times with deionized water and absolute ethanol, placed in an oven at 60°C, dried for 24 hours, and finally placed in a muffle furnace with a heating rate of 10°C / min and annealed at 425°C After 2 hours, the precursor titania nanoflower material was obtained.

[0031] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 mL of deionized water, and add 0.21 mL of chloroauric acid solution containing 2.1 mg of chloroauric acid. Keep the temperature of the solution water bath at 80° C., and the reaction time is 2 hours. After the reaction, the precip...

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Abstract

The invention discloses a preparation method of a gold nano-particle / titanium dioxide nano-flower composite material. Titanium dioxide nano-flowers and gold nano-particles are compounded to form the gold nano-particle / titanium dioxide nano-flower composite material, wherein the titanium dioxide nano-flowers provide a large specific surface area and is rich in a lots of oxygen vacancies. The gold nano-particles are uniformly deposited on the surface of titanium dioxide, and compact contact interfaces are formed among the gold nano-particles and titanium dioxide. The gold nano-particle / titaniumdioxide nano-flower composite material is an efficient and stable photoelectric transforming material, prepared by a one-step simple reduction method, simple in preparation process and applicable to large-scale preparation and industrial production, and reaction conditions are easily controlled.

Description

technical field [0001] The invention relates to a method and application for preparing a gold nanoparticle / titanium dioxide nanoflower composite material by depositing gold nanoparticles on the surface of titanium dioxide nanoflowers, and belongs to the technical field of nanomaterials and photocatalysis. Background technique [0002] In the 21st century, the two major challenges that mankind will face in the course of sustainable development are energy issues and environmental issues. Solar energy has the advantages of being clean, cheap, and renewable. How to efficiently utilize solar energy will be one of the main means to solve energy problems. The photocatalytic hydrogen production technology is based on the chemical conversion and storage of solar energy, and realizes the high-efficiency photolysis of water to produce hydrogen through the excitation of semiconductors by solar energy. Semiconductor photocatalysts such as titanium dioxide, zinc oxide, etc. have attracte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C01B3/04C01B13/02
CPCB01J23/52B01J35/004C01B3/042C01B13/0207Y02E60/36
Inventor 胡海华曹小华
Owner ZHEJIANG UNIV CITY COLLEGE
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