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Gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and preparation method thereof

A gold zinc oxide and nanoparticle technology, which is applied in the field of gold zinc oxide (AuZnO) core-shell heterogeneous nanoparticles and its preparation, can solve the problems of low absorption efficiency, insufficient preparation technology of core-shell heterogeneous composite nanoparticles, electron-space Holes are easy to recombine and other problems, achieving the effect of uniform particle size, good photocatalytic degradation characteristics, and simple and easy-to-operate process

Inactive Publication Date: 2016-04-13
UNIV OF JINAN
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  • Claims
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Problems solved by technology

[0003] In order to solve the problem of low absorption efficiency of zinc oxide (ZnO) nanomaterials for sunlight and the easy recombination of electrons and holes in the photocatalytic reaction, and further improve its catalytic performance, the present invention provides a nanomaterial with strong absorption performance for sunlight Gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles
Another purpose of the present invention is to solve the problem of insufficient preparation technology of existing gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles, and provide a simple and practical preparation of gold zinc oxide (AuZnO) core with strong sunlight absorption performance. Methods for Heterogeneously Composite Nanoparticles with Shells

Method used

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  • Gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and preparation method thereof
  • Gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and preparation method thereof
  • Gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and preparation method thereof

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Embodiment 1

[0033] Preparation of 80nm gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles

[0034] First add diethylene glycol diacrylate (PDDA, Mw=100000-200000, 20wt%) aqueous solution to the ethylene glycol solution, stir well to obtain a mixed solution; then add chloroauric acid to the mixed solution (HAuCl 4 ) aqueous solution, diethylene glycol diacrylate (PDDA), chloroauric acid (HAuCl 4 ) concentrations are respectively 0.025 mol / L and 0.0005 mol / L; subsequently, the prepared solution was placed at 220°C for 30 minutes to obtain a colloidal solution of purple-red gold (Au) octahedral nanoparticles, the size of which is 60 nm, such as figure 1 a. figure 1 b. After naturally cooling to room temperature, 18 MΩ deionized water (H 2 O), zinc nitrate (Zn(NO 3 ) 2 ), sodium hydroxide (NaOH) and sodium borohydride (NaBH 4 ) aqueous solution to obtain a reaction precursor solution for preparing gold zinc oxide (AuZnO) core-shell heterogeneous composite nanopa...

Embodiment 2

[0036] Preparation of 90nm gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles

[0037] Under the condition of magnetic stirring at room temperature, 18 megohm deionized water (H 2 O), zinc nitrate (Zn(NO 3 ) 2 ), sodium hydroxide (NaOH) and sodium borohydride (NaBH 4 ) aqueous solution to obtain a reaction precursor solution for preparing gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles, wherein water (H in the reaction precursor solution 2 The volume percentage of O) is 20%, zinc nitrate (Zn(NO 3 ) 2 ), sodium hydroxide (NaOH), sodium borohydride (NaBH 4 ) concentrations were 0.0008 mol / L, 0.004 mol / L, and 0.0008 mol / L; the reaction precursor solution was reacted at 60 degrees for 20 minutes to obtain a colloidal solution of gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles; After centrifuging with a high-speed centrifuge at a speed of 9000 rpm for 20 minutes, remove the colorless solution in the cen...

Embodiment 3

[0039] Preparation of 100nm gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles

[0040] Under the condition of magnetic stirring at room temperature, 18 megohm deionized water (H 2 O), zinc nitrate (Zn(NO 3 ) 2 ), sodium hydroxide (NaOH) and sodium borohydride (NaBH 4 ) aqueous solution to obtain a reaction precursor solution for preparing gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles, wherein water (H in the reaction precursor solution 2 The volume percentage of O) is 20%, zinc nitrate (Zn(NO 3 ) 2 ), sodium hydroxide (NaOH), sodium borohydride (NaBH 4 ) concentrations were 0.0016 mol / L, 0.008 mol / L, and 0.0016 mol / L; the reaction precursor solution was reacted at 60 degrees for 25 minutes to obtain a colloidal solution of gold zinc oxide (AuZnO) core-shell heterogeneous composite nanoparticles; Use a high-speed centrifuge to centrifuge at a speed of 8000 rpm for 20 minutes, remove the colorless solution in the centrifu...

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Abstract

The present invention relates to gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and a preparation method thereof, wherein the core of the nanoparticle is octahedral gold nanoparticles, the shell layer component is polycrystalline zinc oxide nanoparticles, and the structure parameters of the scale, the zinc oxide shell layer thickness, the gold core size and the like can be effectively regulated respectively within 30-160 nm, 10-30 nm and 50-200 nm. The preparation steps comprise: sequentially adding a proper amount of deionized water, sodium borohydride, zinc nitrate and a sodium hydroxide aqueous solution to a pre-prepared octahedral gold nanoparticle colloid solution, carrying out a reaction for 5-100 min at a temperature of 0-100 DEG C, and centrifugating at a rotation speed of 3000-14500 rotation / min to obtain the gold@zinc oxide nanoparticles. According to the present invention, the gold@zinc oxide nanoparticles have important application valus in the fields of photocatalysis, pollutant degradation, environmental governance, and the like.

Description

technical field [0001] The invention relates to a gold zinc oxide (AuZnO) core-shell heterogeneous nanoparticle with strong solar light absorption performance and a preparation method thereof. Background technique [0002] As a photocatalyst with excellent performance, zinc oxide (ZnO) nanomaterials have very broad application prospects and potentials in photocatalytic degradation, environmental governance and protection. However, there are two urgent problems to be solved in the actual photocatalytic application of single-component zinc oxide (ZnO) nanomaterials: first, the absorption of light by zinc oxide (ZnO) nanoparticles is mainly concentrated in a small section of the ultraviolet region, and The absorption intensity is weak, resulting in a low utilization rate of sunlight; secondly, the photogenerated electrons and holes of zinc oxide (ZnO) nanoparticles are easy to recombine in the photocatalytic reaction, making the catalytic reaction efficiency low, which greatly ...

Claims

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Application Information

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IPC IPC(8): B01J23/66
Inventor 孙一强李村成张涛李杰徐波刘广宁
Owner UNIV OF JINAN
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