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Preparation method for two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst

A nano-photocatalyst and ultra-thin technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of small increase in photocatalytic activity and reduction The area of ​​the photocatalyst absorbing light, weakening the ability of the semiconductor to absorb light, etc., to achieve the effect of improving quantum conversion efficiency, simple production process, and low cost

Active Publication Date: 2013-10-16
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For metal-ZnO heterogeneous materials or doped ZnO, although the surface is enriched with heterogeneous small particles, it can separate photogenerated electrons and photogenerated holes, but at the same time, these heterogeneous small particles not only reduce the ability of photocatalysts to absorb light. The area also enhances the scattering of light so as to weaken the ability of semiconductors to absorb light (J. Mater. Chem., 2012, 22: 17470), which generally leads to a small increase in their photocatalytic activity
It can be seen that there is a limit to a single increase in specific surface area or metal doping to improve the activity of semiconductor photocatalysts.
[0005] However, there are few reports on how to further develop ZnO with a special surface structure that can integrate various photocatalytic influencing factors as much as possible and greatly improve the photocatalytic activity.

Method used

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  • Preparation method for two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst
  • Preparation method for two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst
  • Preparation method for two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst

Examples

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Effect test

Embodiment 1

[0026] A preparation method of a two-dimensional ultrathin mesh ZnO nano photocatalyst, comprising the steps of:

[0027] (1) At room temperature, add zinc acetate dihydrate, 2-2'-bipyridyl, and urea with a molar ratio of 1:1:5 to a mixed solution of ethanol and distilled water at a volume ratio of 1:1, and stir magnetically to make it Fully dissolve, then continue stirring for 1 hour to obtain a uniform mixed solution; the concentration of zinc acetate in the mixed solution is 1.0×10 -2 M, the concentration of 2-2'-bipyridine is 1.0×10 -2 M, the concentration of urea is 5.0×10 -2 M;

[0028] (2) transfer the obtained mixed solution into the inner lining of the autoclave, and place the autoclave at a temperature of 120° C. for heating for 12 hours to obtain a white flocculent precipitate, and the heating equipment is a blast drying oven;

[0029] (3) The white flocculent precipitate was washed several times with ethanol and distilled water respectively, and then centrifuged...

Embodiment 2

[0033] A preparation method of a two-dimensional ultrathin mesh ZnO nano photocatalyst, comprising the steps of:

[0034] (1) At room temperature, add zinc acetate dihydrate, 2-2'-bipyridyl, and urea with a molar ratio of 1:1:5 to a mixed solution of ethanol and distilled water at a volume ratio of 1:1, and stir magnetically to make it Fully dissolve, then continue stirring for 1 hour to obtain a uniform mixed solution; the concentration of zinc acetate in the mixed solution is 5.0×10 -3 M, the concentration of 2-2'-bipyridine is 5.0×10 -3 M, the concentration of urea is 2.5×10 -2 M;

[0035] (2) transfer the obtained mixed solution into the inner lining of the autoclave, and place the autoclave at a temperature of 150° C. for heating for 12 hours to obtain a white flocculent precipitate, and the heating equipment is a blast drying oven;

[0036] (3) The white flocculent precipitate was washed several times with ethanol and distilled water, and then centrifuged, and then dr...

Embodiment 3

[0040] A preparation method of a two-dimensional ultrathin mesh ZnO nano photocatalyst, comprising the steps of:

[0041] (1) At room temperature, add zinc acetate dihydrate, 2-2'-bipyridyl, and urea with a molar ratio of 1:1:5 to a mixed solution of ethanol and distilled water at a volume ratio of 1:1, and stir magnetically to make it Fully dissolve, then continue stirring for 1 hour to obtain a uniform mixed solution; the concentration of zinc acetate in the mixed solution is 1.0×10 -2 M, the concentration of 2-2'-bipyridine is 1.0×10 -2 M, the concentration of urea is 5.0×10 -2 M;

[0042] (2) Transfer the obtained mixed solution into the inner lining of the autoclave, place the autoclave at a temperature of 180° C. and heat for 12 hours to obtain a white flocculent precipitate, and the heating equipment is a blast drying oven;

[0043] (3) The white flocculent precipitate was washed several times with ethanol and distilled water, and then centrifuged, and then dried in ...

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Abstract

The invention relates to a preparation method for a two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst, which comprises the following steps: 1, adding zinc acetate dehydrate, 2-2'dipyridyl and urea at the molar ratio of 1:1:5 into a mixed solution of ethanol and distilled water, performing magnetic stirring until sound dissolution, and continuously stirring for 1 hour to obtain a mixed solution with the zinc acetate concentration of 10<-3>-10<-2>M; 2, transferring the mixed solution into an inner lining of a high-pressure reaction kettle which is heated for 12 hours at the temperature of 120-180 DEG C, and obtaining white flocky precipitate; 3, allowing the white flocky precipitate to be subjected to centrifugation after being cleaned by ethanol and distilled water in sequence, and drying for 8 hours at the temperature of 60 DEG C to obtain an alkali type zinc carbonate ultrathin layer precursor; and 4, roasting the precursor obtained in the step 3 for 2 hours at the temperature of 300-500 DEG C, so as to obtain the two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst. The two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst prepared by the method is higher in activity.

Description

technical field [0001] The invention relates to a preparation method of a ZnO nanometer photocatalyst, in particular to a preparation method of a two-dimensional ultrathin mesh ZnO nanometer photocatalyst. Background technique [0002] ZnO is a typical wide-bandgap semiconductor (3.37eV) and has potential applications in the photocatalytic degradation of organic matter in polluted water. In recent years, nano-ZnO photocatalysts have been widely used due to their relatively high photocatalytic activity and stable and difficult to be corroded by light during the photocatalytic process, coupled with a series of advantages such as low price, strong plasticity, and high quantum effect. Among them, improving the photocatalytic degradation activity of ZnO is one of the hotspots of its research. [0003] One of the methods of improving the photocatalytic degradation activity of ZnO at present is to increase the specific surface area of ​​photocatalyst, as solvothermal method has pr...

Claims

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Application Information

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IPC IPC(8): B01J23/06
Inventor 童艳花曹枫杨金田徐敏虹
Owner HUZHOU TEACHERS COLLEGE
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