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

A technology of silver nanoparticles and titanium dioxide, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of low photocatalytic hydrogen production efficiency and achieve the effects of improving photocatalytic hydrogen production efficiency, low production cost, and increasing multiple scattering performance

Active Publication Date: 2020-04-24
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above problems, to provide a method for preparing a novel composite material by using titanium dioxide oxygen vacancies with reductive one-step deposition of silver nanoparticles, which solves the serious limitation of the internal recombination of photogenerated carriers in titanium dioxide in the prior art. Hydrogen inefficiency problem

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0020] Step 1: Add 0.025ml of diethylenetriamine (EDTA) to 31.5ml of isopropanol, and stir for 10min. Further, 1.125 ml of diisopropyl di(acetylacetonate) 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, 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 at high temperature for 2 hours to obtain the precursor titania nanoflower material.

[0021] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 ml of deionized water, and add 1.57 mg of silver nitrate. Keep the temperature of the solution water bath at 80° C., and the reaction time is 2 hours. After the reaction, the precip...

Embodiment 2

[0027] Step 1: Add 0.025ml of diethylenetriamine (EDTA) to 31.5ml of isopropanol, and stir for 10min. Further, 1.125 ml of diisopropyl di(acetylacetonate) 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, 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 at high temperature for 2 hours to obtain the precursor titania nanoflower material.

[0028] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 ml of deionized water, and add 3 mg of silver nitrate. Keep the temperature of the solution water bath at 100° C., and the reaction time is 5 hours. After the reaction, the precipit...

Embodiment 3

[0032] Step 1: Add 0.125ml of diethylenetriamine (EDTA) to 31.5ml of isopropanol, and stir for 10min. Further, 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, and dried for 24 hours. Finally, the reactant was placed in a muffle furnace with a heating rate of 10°C / min and a temperature of 425°C. High-temperature annealing for 5 hours to obtain the precursor titania nanoflower material.

[0033] Step 2: Take 100 mg of the precursor titanium dioxide nanoflowers and add it to 50 ml of deionized water, and add 1.57 mg of silver nitrate. Keep the temperature of the solution water bath at 80° C., and the reaction time is 2 hours. After the reaction, the precipitat...

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Abstract

The invention discloses a preparation method for depositing silver on the surfaces of titanium dioxide nanoflowers. A silver nanoparticle / titanium dioxide nanoflower composite material prepared by themethod is formed by compounding titanium dioxide nanoflowers and silver nanoparticles, wherein the titanium dioxide nanoflowers provide a large specific surface area and are rich in a large number ofoxygen vacancies, silver nanoparticles are uniformly reduced and deposited on the surface of titanium dioxide, and close interfacial contact is formed between the silver nanoparticles and the titanium dioxide. The silver nanoparticle / titanium dioxide nanoflower composite material disclosed by the invention is a high-efficiency and stable photoelectric conversion material, a one-step simple reduction method is adopted, the preparation process is simple, reaction conditions are easy to control, and the method is suitable for large-scale preparation and industrialized production.

Description

technical field [0001] The invention relates to a silver nanoparticle composite material deposited on the surface of titanium dioxide nanoflowers, a preparation method and application thereof, and belongs to the technical field of nanomaterials and photocatalysis. Background technique [0002] With the development of today's society and economy, the existing fossil energy of Dihua is far from meeting the growing energy demand of human beings, and the problems of energy shortage and environmental pollution have become increasingly prominent. Photocatalytic water splitting to produce hydrogen is an effective way to solve this problem. Solar energy resources are inexhaustible, if the solar energy is effectively utilized, the fossil energy crisis will be greatly alleviated. Use solar energy to decompose water into hydrogen, and the product of hydrogen combustion is water, which is environmentally friendly, pollution-free and can be recycled. Since the early 1970s, Japanese sci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/10C02F1/30C02F1/50C01B3/04
CPCB01J23/50B01J35/004B01J35/1004C01B3/042C01B2203/0277C01B2203/1041C02F1/30C02F1/50C02F2305/10Y02E60/36
Inventor 胡海华曹小华
Owner ZHEJIANG UNIV CITY COLLEGE
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