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Carbonized plant leaf @ZnO/Au heterojunction multistage structure assembly catalyst and preparation method thereof

A technology for carbonizing plants and plant leaves, applied in the field of photocatalysis, can solve the problems of poor dispersion of nano-powder catalytic materials, high photo-generated electron-hole recombination rate, limited sunlight utilization, etc., and achieves good photocatalytic degradation performance, The effect of improving light energy harvesting ability and improving photocatalytic efficiency

Active Publication Date: 2019-01-18
JILIN UNIV
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Problems solved by technology

At present, there are still three problems to be solved urgently in the practical application of pure ZnO catalysts: one is the poor absorption ability of semiconductors in the visible light region, which seriously limits the utilization of sunlight; the other is the high recombination rate of photogenerated electron-hole pairs, The light quantum efficiency is low; the third is that the nano powder catalytic material has poor dispersion, is prone to agglomeration, and is not easy to separate solid and liquid
However, there is no report on the construction of multi-level structure assemblies and related performance studies using carbonized blades as substrates to modify semiconductor nanoparticles.

Method used

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  • Carbonized plant leaf @ZnO/Au heterojunction multistage structure assembly catalyst and preparation method thereof
  • Carbonized plant leaf @ZnO/Au heterojunction multistage structure assembly catalyst and preparation method thereof
  • Carbonized plant leaf @ZnO/Au heterojunction multistage structure assembly catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Fresh spinach leaves (35.2 mg) were cleaned with deionized water and frozen at -20°C for 24 hours, then vacuum freeze-dried at -50°C for 48 hours, and then the freeze-dried leaves were placed in a tube furnace Calcined at a high temperature of 1000° C. for 1 hour to obtain carbonized spinach leaves (4.3 mg).

[0020] 2) Add 22mg of zinc acetate into 10mL of anhydrous methanol, heat and stir at 60°C to fully dissolve, then add 10mL of 0.03M methanol solution of sodium hydroxide dropwise; continue heating and stirring at 60°C for 2 hours to obtain a spherical ZnO nanocrystal seed solution; After the nanocrystal seed solution is naturally cooled to room temperature, the carbonized spinach blade obtained in step 1) is immersed in the above-mentioned ZnO nanocrystal seed solution and taken out after 10 seconds, so that the seeds evenly cover the blade surface, and then placed Heat in an oven at 90°C for 20 minutes to fix the ZnO seeds on the surface of the leaves; then pr...

Embodiment 2

[0028] 1) Fresh spinach leaves (40.8mg) were frozen at -20°C for 24 hours, then vacuum freeze-dried at -50°C for 48 hours, and the freeze-dried leaves were calcined at 750°C in a tube furnace for 2 hours Carbonized spinach leaves (4.9 mg) were obtained.

[0029] 2) Add 22mg of zinc acetate into 10mL of anhydrous methanol, heat and stir at 60°C to fully dissolve, then add 10mL, 0.03M methanolic sodium hydroxide solution dropwise; continue heating and stirring at 60°C for 2 hours to obtain a spherical ZnO nanocrystal seed solution; After the nanocrystal seed solution is naturally cooled to room temperature, the carbonized spinach blade obtained in step 1) is immersed in the above-mentioned ZnO nanocrystal seed solution and taken out after 10 seconds, so that the seeds evenly cover the blade surface, and then placed Heat in an oven at 90°C for 20 minutes to fix the ZnO seeds on the surface of the leaves; then prepare an aqueous alkali solution of zinc salt, wherein the zinc salt ...

Embodiment 3

[0032] 1) Fresh spinach leaves (31.7mg) were frozen at -20°C for 24 hours, then vacuum freeze-dried at -50°C for 48 hours, and the freeze-dried leaves were calcined at 1000°C in a tube furnace for 1 hour Carbonized spinach leaves (3.8 mg) were obtained.

[0033] 2) Add 20 mg of zinc acetate into 10 mL of anhydrous methanol, heat and stir at 60 ° C to fully dissolve, then add 10 mL of 0.03 M sodium hydroxide methanol solution dropwise; continue heating and stirring at 60 ° C for 2 hours to obtain a spherical ZnO nanocrystal seed solution; After the nanocrystal seed solution is naturally cooled to room temperature, the carbonized spinach blade obtained in step 1) is immersed in the above-mentioned ZnO nanocrystal seed solution and taken out after 10 seconds, so that the seeds evenly cover the blade surface, and then placed Heat in an oven at 90°C for 20 minutes to fix the ZnO seeds on the surface of the leaves; then prepare an aqueous alkali solution of zinc salt, wherein the zi...

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Abstract

The invention relates to a carbonized plant leaf @ZnO / Au heterojunction multistage structure assembly catalyst and a preparation method thereof, and belongs to the technical field of photocatalysis. In the invention, firstly carbonized plant leaves are prepared by using plant leaves widely existing in nature as raw materials, and then ZnO nanorod arrays grow on the carbonized leaves, and finally Au nanoparticles are loaded on a ZnO surface by adopting a method of photoreduction of HAuCl4 to obtain the photocatalyst. A ratio of ZnO to Au in the multistage structural assembly can be convenientlyadjusted by changing a ratio of a gold source and a zinc source which are added as well as an illumination time. The carbonized plant leaf @ZnO / Au heterojunction multistage structure assembly maintains a unique interpenetrating three-dimensional network structure of plant leaves, so as to improve the light energy capturing capability of the catalyst, and a large specific surface area and the interpenetrating network structure of the multistage structure assembly also facilitate the contact of reactants with the catalyst as well as the diffusion of liquid, so that the photocatalytic efficiencycan be improved from various aspects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and specifically relates to a carbonized plant leaf@ZnO / Au heterojunction multilevel structure assembly catalyst and a preparation method thereof. Background technique [0002] Photocatalytic oxidation technology is considered to be one of the most promising technologies for solving environmental pollution problems. Photocatalytic oxidation technology mainly degrades pollutants through the free radical oxidation reaction between free radicals generated by the action of light and catalysts and organic pollutants. So far, more than 3000 refractory organic compounds have been found to be rapidly degraded by semiconductor photocatalytic oxidation. In recent years, the preparation of high-efficiency photocatalysts has been a research hotspot for scientists. Among the commonly used semiconductor photocatalysts, the preparation cost of ZnO is relatively low, and it has a low growth and crystall...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J37/08B01J37/16
CPCB01J23/66B01J37/084B01J37/16B01J35/393B01J35/39
Inventor 孙航秦蓁商殷兴汤亚男尹升燕
Owner JILIN UNIV
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