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Ag/ZnO hexagonal composite nano sheet as well as preparation method and application thereof

A technology of hexagonal and nanosheets, which is applied in the field of Ag/ZnO hexagonal composite nanosheets and its preparation, can solve the problems of affecting the photocatalytic activity of materials, Ag is easy to agglomerate, etc., and achieve excellent photocatalytic activity and strong visible light absorption capacity. Effect

Pending Publication Date: 2021-07-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many Ag / ZnO heterostructures have been disclosed in the prior art. Because noble metals play the role of electron absorption and capture on the semiconductor surface, their application in the field of photocatalysis can show excellent photocatalytic activity, but the inventors found that, The existing preparation method generally uses a one-step solvothermal method to synthesize Ag / ZnO composite materials. This method will cause Ag to easily agglomerate during the preparation process, and the agglomerated Ag will affect the photocatalytic activity of the material.

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  • Ag/ZnO hexagonal composite nano sheet as well as preparation method and application thereof
  • Ag/ZnO hexagonal composite nano sheet as well as preparation method and application thereof
  • Ag/ZnO hexagonal composite nano sheet as well as preparation method and application thereof

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preparation example Construction

[0031] In one or more embodiments of the present invention, the specific steps of the preparation method are as follows:

[0032] 1) Dissolve the zinc salt in deionized water, stir and heat until completely dissolved, slowly add 1 mL of hydrazine hydrate dropwise, and react at a constant temperature; wherein, hydrazine hydrate is used as a reducing agent to synthesize hexagonal ZnO nanosheets through chemical bath precipitation;

[0033] 2) After natural cooling, the obtained product is suction filtered, washed and dried to obtain hexagonal ZnO nanosheets.

[0034] 3) Disperse the synthesized hexagonal ZnO nanosheets in a silver nitrate solution and stir for a period of time in the absence of light;

[0035] 4) Under vigorous stirring, the mixture is irradiated with ultraviolet light for a period of time, and the obtained product is suction-filtered, washed, and dried to obtain Ag / ZnO hexagonal composite nanosheets.

[0036] In one or more embodiments of the present invention...

Embodiment 1

[0047] Dissolve 3.67 g of zinc acetate in 100 mL of deionized water, and heat in an oil bath with magnetic stirring until completely dissolved. When the mixture was heated to 80 °C, 1 mL of hydrazine hydrate was slowly added dropwise into the reactor under vigorous stirring. After constant temperature reaction for 12 h, the white precipitate was filtered, washed several times with absolute ethanol and deionized water, and then dried in an oven at 60° C. for 10 h to synthesize hexagonal ZnO nanosheets. The XRD pattern of the obtained sample is shown in figure 1 As shown in a, it can be seen from the figure that ZnO has a wurtzite structure without impurity peaks. SEM image ( figure 2 a-b) It can be seen that the synthesized hexagonal ZnO nanosheets have regular shape, smooth surface and an average size of 700nm.

[0048] 0.41 g of silver nitrate was added to 100 mL of deionized water to form a silver nitrate solution, and then 0.24 g of hexagonal ZnO nanosheets were dispers...

Embodiment 2

[0051] Dissolve 3.79 g of zinc nitrate in 100 mL of deionized water, and heat in an oil bath with magnetic stirring until completely dissolved. When the mixture was heated to 90 °C, 1 mL of hydrazine hydrate was slowly added dropwise into the reactor under vigorous stirring. After constant temperature reaction for 12 h, the white precipitate was filtered, washed several times with absolute ethanol and deionized water, and then dried in an oven at 60° C. for 10 h to synthesize hexagonal ZnO nanosheets.

[0052] 0.41 g of silver nitrate was added to 100 mL of deionized water to form a silver nitrate solution, and then 0.24 g of hexagonal ZnO nanosheets were dispersed in the silver nitrate solution. The mixture was stirred for 1.5 h in the dark to allow the Ag + The ions were completely adsorbed on the surface of the hexagonal ZnO nanosheets, and then irradiated for 1 h using a 400W xenon lamp (Beijing Porphylai PLS-SXE300UV) under vigorous stirring. The final product was washe...

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Abstract

The invention belongs to the field of semiconductor nano materials, and particularly relates to an Ag / ZnO hexagonal composite nano sheet and a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a ZnO hexagonal nano sheet through a photo-chemical deposition process, then putting the ZnO hexagonal nano sheet into a silver nitrate solution, and carrying out ultraviolet light treatment to obtain the Ag / ZnO hexagonal composite nano sheet. The Ag / ZnO hexagonal composite nano sheet is prepared by adopting a two-step method, so that Ag particles can be highly dispersed on the hexagonal ZnO nano sheet, the Ag particles can play a role in electron absorption and capture on the surface of a semiconductor more favorably, and the composite material shows higher visible light absorption capacity and shows more excellent photocatalytic activity on degradation of organic pollutants under visible light.

Description

technical field [0001] The invention belongs to the field of semiconductor nanomaterials, in particular to an Ag / ZnO hexagonal composite nanosheet and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the continuous development of my country's economy, the types of industrial wastewater continue to increase, and the harm of various pollutants to the environment is also increasing. Various toxic and refractory organic substances (such as halogenated solvents, benzene-based solvents, aldehydes, ketones, and aromatic amino compounds, etc.) are discharged into water bodies. These organic pollutants have a great impact on human health...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J37/34C02F101/30C02F101/38C02F101/36C02F101/34
CPCB01J23/66B01J37/345C02F1/30C02F2305/10C02F2101/308C02F2101/38C02F2101/36C02F2101/34B01J35/39B01J35/40
Inventor 刘海霞滕梦媛林本盛李天铎
Owner QILU UNIV OF TECH
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