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Preparation method and application of silver/zinc oxide composite material

A composite material, zinc oxide technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that the particle size of Ag nanoparticles is difficult to be effectively controlled.

Inactive Publication Date: 2019-04-12
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is worth noting that when using this method to synthesize Ag / ZnO, when the content of Ag loaded on ZnO increases, the particle size of Ag nanoparticles is difficult to be effectively controlled

Method used

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  • Preparation method and application of silver/zinc oxide composite material
  • Preparation method and application of silver/zinc oxide composite material
  • Preparation method and application of silver/zinc oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Option 1: first add zinc acetate, L-aspartic acid, diethanolamine and deionized water into a 25mL reaction kettle and mix evenly, and then put them in an oven for reaction. After the reaction, the obtained product was washed twice with deionized water, and then washed twice with absolute ethanol, and then put into a vacuum drying oven to dry for 12 hours at a temperature of 40°C. After drying, ZnO powder was obtained.

[0022] Change the raw material components, hydrothermal reaction temperature, time, and make four groups of samples. See Table 1 for the data.

[0023] Table 1 Raw material ratio and reaction conditions of each group for ZnO sample preparation

[0024] Sample serial number

1

2

3

4

Zinc acetate (mmol)

1.8

2.0

2.5

2.0

L-Aspartic Acid (mg)

100

100

120

120

Diethanolamine (ml)

10

10

10

10

Deionized water (ml)

5

5

5

5

temperature(°C)

140

140

140

...

Embodiment 2

[0040] Photocatalytic experiment and ultraviolet-visible spectroscopy (uv-vis) analysis

[0041] Methyl orange (C 14 h 14 N 3 SO 3 Na), it can be used as an acid-base indicator, and its shape is orange-red powder, which is alkaline. Rhodamine B(C 28 h 31 CIN 2 o 3 ), is a kind of organic dye that is relatively difficult to degrade. Because it is toxic and has a certain risk of pollution to food and water sources, it is proposed to study the performance of the sample through the photocatalytic degradation experiment of rhodamine B and methyl orange. .

[0042] Weigh 40mg of ZnO sample or Ag / ZnO sample and mix with 10mL of methyl orange or rhodamine B solution, add 40mL of deionized water, stir on a magnetic stirrer for 60min in a dark environment, and then irradiate with a xenon lamp After 60 minutes, sample 2 mL with a straw at the beginning, and take a sample every 10 minutes. Then use the ultraviolet-visible spectrometer to measure the absorption curve of the sampl...

Embodiment 3

[0046] Reaction Mechanism and Product Photocatalytic Mechanism

[0047] 1. The growth mechanism of ZnO and Ag / ZnO

[0048] (1) In the hydrothermal reaction, ZnO will have the following reactions:

[0049] Zn 2+ +4OH - →Zn(OH) 4 2- (1)

[0050]

[0051] ZnO→ZnO X (1-X)V 0 , 0﹤X﹤1 (3)

[0052] Zinc acetate is used as the precursor of the product zinc oxide, and diethanolamine provides an alkaline environment to promote Zn(OH) 4 2- The formation of ZnO is to promote the production of ZnO precursor.

[0053] (2) The first few steps of the growth of Ag / ZnO are the same as the previous section, and the loading of Ag is completed on this basis:

[0054] Zn 2+ +4OH - →Zn(OH) 4 2- (1)

[0055]

[0056] ZnO→ZnO X (1-X)V 0 , 0﹤X﹤1 (3)

[0057] Ag + +2OH→Ag(OH) 2 - (4)

[0058] Zn(OH) 4 2- +2Ag(OH) 2 - → Ag 2 O / ZnO+2H 2 O+4OH - (5)

[0059] Ag 2 O / ZnO→Ag / ZnO X (1-X)V 0 , 0﹤X﹤1 (6)

[0060] Its growth process is basically similar to the previous...

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Abstract

The invention provides a preparation method and application of a silver / zinc oxide composite material, and relates to the technical field of preparation and application of zinc oxide photocatalysts. Zinc acetate, silver nitrate, L-aspartic acid, diethanol amine and deionized water are uniformly mixed and then placed into a reaction kettle for hydrothermal reaction, and the product is washed and dried to obtain the silver / zinc oxide composite material. It is found that the effect of the silver / zinc oxide composite material is much better than that of zinc oxide through photocatalytic experiments of methyl orange and rhodamine B. It is found that rodlike zinc oxide can be assembled into a rule body better, change the distribution of electric charge of the surface of the zinc oxide, and improve photo-induced electron space of the zinc oxide after Ag loading through tests of a scanning electron microscope, an X-ray diffraction spectrogram, an ultraviolet-visible absorption spectrogram andthe like, the comparison with a microstructure of the zinc oxide and the analysis of ZnO and Ag / ZnO from a growth mechanism and a photocatalytic mechanism. In general, Ag loading has a good effect onthe performance improvement of the zinc oxide.

Description

technical field [0001] The invention relates to the technical field of preparation and application of zinc oxide-based photocatalysts, in particular to a preparation method and application of a silver / zinc oxide composite material. Background technique [0002] With the advancement of society and technology, the development of materials is also constantly advancing. In the 1980s, a lot of research has been done on nanomaterials and good progress has been made. Good results have been obtained in the preparation and performance research of thin films. In 1991, Japanese scientist Iijima observed carbon nanotubes for the first time using an electron microscope. On this basis, people became more and more interested in nanomaterials. 1997 Z.K.Tang et al. ] Researched ZnO thin films and made contributions to the research of later generations. In 2001, Hang et al studied ZnO nanowires. Since then, on the basis of predecessors' research, later generations have continued to condu...

Claims

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Application Information

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IPC IPC(8): B01J23/66C02F1/30C02F101/30
CPCC02F1/30B01J23/66B01J37/10C02F2101/308C02F2305/10B01J35/39
Inventor 徐泽忠郑长江杨智慧谢劲松杨本宏
Owner HEFEI UNIV
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