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Preparation method for dandelion-shaped core-shell structure Au@ZnO heterojunction catalyst

A core-shell structure and dandelion-like technology is applied in the field of preparation of AuZnO heterojunction photocatalysts with dandelion-like core-shell structure, which can solve the problems of ineffective separation of photogenerated carriers, limited ability to absorb light, and low utilization rate. Achieve the effect of improving photoelectric performance, good permeability, and improving catalytic stability

Inactive Publication Date: 2014-01-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the core-shell structure prepared by this method is still a wide-band semiconductor composite material, and the photogenerated carriers cannot be effectively separated when applied, and the ability to absorb light is limited, so the efficiency is relatively low. In addition, the specific surface area is small and the utilization rate is not good. high

Method used

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  • Preparation method for dandelion-shaped core-shell structure Au@ZnO heterojunction catalyst
  • Preparation method for dandelion-shaped core-shell structure Au@ZnO heterojunction catalyst

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Embodiment 1

[0024] The preparation method of dandelion-like core-shell structure AuZnO heterojunction photocatalyst comprises the following steps:

[0025] (1) Use the traditional sodium citrate reduction method to prepare Au nanoparticles of about 20nm, take 10mg of the particles and disperse them in 20ml of water, add 270ul mercaptopropionic acid, mix and stir overnight, centrifuge, and wash off the excess mercaptopropionic acid acid, dispersed in 20ml ethanol to make primary seeds.

[0026] (2) Mix the 20ml ethanol-dispersed primary Au seeds obtained in (1) with 100ml containing 0.75mmol Zn(Ac) 2 mixed with the ethanol solution, stirred for 1 hour, then added 50ml of ethanol solution containing 1.125mmol KOH, and reacted for 2 hours at 60°C to obtain a structure of ZnO particles enclosing Au particles, and AuZnO core-shell secondary composite seeds for later use.

[0027] (3) Re-disperse the AuZnO seeds obtained in (2) into 20ml of water, add to 50ml containing 0.125mmol Zn(Ac) 2 and...

Embodiment 2

[0029] The preparation method of dandelion-like core-shell structure AuZnO heterojunction photocatalyst comprises the following steps:

[0030] (1) Use the traditional sodium citrate reduction method to prepare Au nanoparticles of about 20nm, take 10mg of the particles and disperse them in 20ml of water, add 270ul mercaptopropionic acid, mix and stir overnight, centrifuge, and wash off the excess mercaptopropionic acid acid, dispersed in 20ml ethanol to make primary seeds.

[0031] (2) Mix the 20ml ethanol-dispersed primary Au seeds obtained in (1) with 100ml containing 0.25mmol Zn(Ac) 2 Mix the ethanol solution, stir for 1 hour, then add 50ml of ethanol solution containing 0.375mmol KOH, and react for 2 hours at 60°C to obtain a structure of ZnO particles enclosing Au particles, and AuZnO core-shell secondary composite seeds for later use.

[0032] (3) Re-disperse the AuZnO seeds obtained in (2) into 20ml of water, add to 50ml containing 0.125mmol Zn(Ac) 2 and 0.125 mmol of...

Embodiment 3

[0034] The preparation method of dandelion-like core-shell structure AuZnO heterojunction photocatalyst comprises the following steps:

[0035] (1) Use the traditional sodium citrate reduction method to prepare Au nanoparticles of about 20nm, take 10mg of the particles and disperse them in 20ml of water, add 270ul mercaptopropionic acid, mix and stir overnight, centrifuge, and wash off the excess mercaptopropionic acid acid, dispersed in 20ml ethanol to make primary seeds.

[0036] (2) Mix the 20ml ethanol-dispersed primary Au seeds obtained in (1) with 100ml containing 0.75mmol Zn(Ac) 2Mix the ethanol solution, stir for 1 hour, then add 50ml of ethanol solution containing 1.125mmol KOH dropwise, and react for 2 hours at 60 degrees to obtain a structure of Au particles wrapped in ZnO particles, and AuZnO core-shell secondary composite seeds, which are set aside.

[0037] (3) Re-disperse the AuZnO seeds obtained in (2) into 20ml of water, add to 50ml containing 0.25mmol Zn(Ac)...

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Abstract

The invention relates to a preparation method for a dandelion-shaped core-shell structure Au@ZnO heterojunction catalyst. According to the preparation method, in a water solution, a dandelion-shaped high-grade structure Au@ZnO heterojunction material which takes a gold nanoparticle as an inner core and has zinc oxide nano rods growing at the periphery of the gold core in a radial shape is obtained by a seed growing method. Compared with the prior art, the high-grade core-shell Au@ZnO heterojunction catalyst with Au nanoparticles inside and ZnO outside is obtained firstly in a moderate water solution system through hetero-structured seed induction; with the adoption of the structure, the material has a stable and efficient photocatalytic performance; the material is simple in preparation method, is good in repeatability and can be subjected to volume production; the material has a good application prospect in the fields of photocatalytic degradation of environmental pollutants, solar-energy hydrogen production and the like.

Description

technical field [0001] The invention relates to the field of preparation of metal-semiconductor composite materials, in particular to a method for preparing a dandelion-shaped core-shell structure AuZnO heterojunction photocatalyst. Background technique [0002] As a typical metal-semiconductor composite material, AuZnO heterojunction has become one of the recent research hotspots due to its special optical and photoelectric properties and potential applications in solar energy conversion, biological detection, chemical sensing and other fields. At present, most of the work of synthesizing AuZnO heterojunction is to deposit or grow Au nanoparticles on the ZnO structure. On the contrary, the work of growing ZnO to obtain AuZnO advanced core-shell structure with gold nanoparticles as the core is rarely reported. This may be due to the more hydrophilic properties of oxides, which are easier to self-nucleate and deposit in the water phase, and are not easy to nucleate and precip...

Claims

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Application Information

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IPC IPC(8): B01J23/60B01J35/10B82Y40/00B82Y30/00
Inventor 秦瑶杨金虎金超李影李杰时东陆
Owner TONGJI UNIV
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