Method for synthetizing Au/ZnO bar-shaped heterojunction photocatalyst

A photocatalyst, heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high semiconductor carrier recombination rate, size, Uniformity is difficult to control, low solar energy utilization efficiency, etc., to achieve good application prospects, stable and efficient visible light catalytic performance, and improved catalytic effect.

Active Publication Date: 2015-12-30
JILIN UNIV
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  • Application Information

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Problems solved by technology

At present, there are still two problems to be solved urgently in the practical application of pure ZnO catalysts: first, the utilization efficiency of solar energy is low, ZnO mainly absorbs light in a small section of the ultraviolet region, and can only use 4% of the solar spectrum range. Second, the recombination rate of semiconductor carriers is high, and the photon quantum efficiency is low
However, since the size and uniformity of ZnO nanorods in the solution phase are more difficult to control than the substrate growth method, there is no report on the solution phase noble metal particle / ZnO nanorod heterostructure.

Method used

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Effect test

Embodiment 1

[0018] Au nanoparticle colloid solution (the diameter of Au nanoparticle is 40nm) was prepared by reducing chloroauric acid with sodium citrate. After centrifuging 30mL of the Au nanoparticle colloidal solution at a speed of 6000rpm for 8 minutes, the lower layer of concentrated solution (0.4mL in volume) was taken, and then 240mL of polyvinylpyrrolidone aqueous solution with a concentration of 20mg / mL and nitric acid with a concentration of 50mM were added successively. 5 mL of zinc aqueous solution, 5 mL of hexamethylenetetramine aqueous solution with a concentration of 50 mM, and then heated at 95 ° C for 2.5 hours to obtain a pink Au / ZnO rod-shaped heterojunction photocatalyst with a product quality of 20 mg.

[0019] Embodiment 1 performance test

[0020] Get 4mg of the Au / ZnO rod-shaped heterojunction photocatalyst prepared by the present invention and add it into 4mL of rhodamine B aqueous solution (5ppm), stir in the dark for 30min so that the nanoparticles are evenly ...

Embodiment 2

[0026] Au nanoparticle colloid solution (the diameter of Au nanoparticle is 40nm) was prepared by reducing chloroauric acid with sodium citrate. After centrifuging 30mL of the Au nanoparticle colloidal solution at a speed of 6000rpm for 8 minutes, take the lower layer of concentrated solution (volume is 0.4mL), and then add 240mL of polyvinylpyrrolidone aqueous solution with a concentration of 10mg / mL, and nitric acid with a concentration of 50mM 5 mL of zinc aqueous solution and 5 mL of hexamethylenetetramine aqueous solution with a concentration of 50 mM were then heated at 95°C for 2.5 hours to obtain a pink Au / ZnO rod-shaped heterojunction photocatalyst with a product quality of 19 mg.

[0027] attached Figure 5is the transmission electron micrograph of the obtained Au / ZnO rod-shaped heterojunction photocatalyst. As shown in the figure, a uniform rod-like structure is displayed in a large range, with a rod length of 1900nm and a width of 500nm; the Au nanoparticles are u...

Embodiment 3

[0029] The Au nanoparticle colloid solution (the diameter of the Au nanoparticle is 15 nm) was prepared by reducing chloroauric acid with sodium citrate. After centrifuging 60mL of the Au nanoparticle colloidal solution at a speed of 12000rpm for 15 minutes, the concentrated solution of the lower layer (volume is 0.8mL) was taken, and then 240mL of polyvinylpyrrolidone aqueous solution with a concentration of 20mg / mL and nitric acid with a concentration of 50mM were added successively. 5 mL of zinc aqueous solution, 5 mL of hexamethylenetetramine aqueous solution with a concentration of 50 mM, and then heated at 95 ° C for 2.5 hours to obtain a pink Au / ZnO rod-shaped heterojunction photocatalyst with a product quality of 20 mg.

[0030] The prepared Au / ZnO rod-shaped heterojunction photocatalyst has a length of 1300nm and a width of 500nm; the ZnO rod has a wurtzite structure, and Au nanoparticles are uniformly decorated on the surface of the ZnO rod, and the diameter of the Au...

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Abstract

The invention relates to a method for synthetizing an Au/ZnO bar-shaped heterojunction photocatalyst and belongs to the technical field of preparation of semiconductor photocatalysts. The method comprises steps as follows: firstly, an Au nanoparticle colloidal solution is prepared and obtained with a method of chloroauric acid reduction by sodium citrate and serves as a primary reaction seed; then the Au nanoparticle colloidal solution is concentrated with a centrifugal separation method, 4.8-240 mL of an aqueous surfactant solution with the concentration being 10mg/mL-20mg/mL, 0.1-5mL of an aqueous zinc salt solution with the concentration being 50mM and 0.1-5mL of an alkaline solution with the concentration being 50mM are sequentially added to a concentration product, the mixture is heated for 2.5-3 hours at the temperature ranging from 80 DEG C to 95 DEG C, and the pink Au/ZnO bar-shaped heterojunction photocatalyst is obtained. An experiment result shows that the catalytic effect of the semiconductor photocatalyst in visible light with the maximum absorption wavelength larger than 420nm is remarkably improved than that of a ZnO bar, and the photocatalyst has good application prospect in the field of photocatalytic degradation of environmental pollutants, solar cells, solar hydrogen production and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalyst preparation, and in particular relates to a method for synthesizing an Au / ZnO rod-shaped heterojunction photocatalyst. Background technique [0002] Photocatalytic oxidation technology is considered to be one of the most promising technologies for solving environmental pollution problems. So far, more than 3000 refractory organic compounds have been found to be rapidly degraded by photocatalytic oxidation. Among semiconductors commonly used in photocatalytic technology, ZnO is relatively inexpensive to prepare, has a low growth and crystallization temperature, and is easy to prepare various shapes and structures, which has attracted more and more attention. At present, there are still two problems to be solved urgently in the practical application of pure ZnO catalysts: first, the utilization efficiency of solar energy is low, ZnO mainly absorbs light in a small section of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66
Inventor 孙航佘萍尹升燕许孔亮何沁容曾珊
Owner JILIN UNIV
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