ZnO/g-C3N4 composite photocatalyst as well as preparation method and application thereof

A technology of g-c3n4 and recombination light, which is applied in the direction of physical/chemical process catalysts, carbon-based compound preparation, chemical instruments and methods, etc., can solve problems such as poor response to visible light, achieve reduced recombination rate, simple and convenient operation, and reduce costs Effect

Inactive Publication Date: 2019-08-16
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite its many advantages, it also has certain limitations, such as poor response to visible light in photocatalytic reactions due to its wide bandgap (3.37eV) and rapid recombination of photogenerated electron-hole pairs

Method used

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  • ZnO/g-C3N4 composite photocatalyst as well as preparation method and application thereof
  • ZnO/g-C3N4 composite photocatalyst as well as preparation method and application thereof
  • ZnO/g-C3N4 composite photocatalyst as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0026] ZnO / g-C 3 N 4 composite photocatalyst

[0027] (1) The preparation method is as follows

[0028] 1) Pour 2.52g of melamine into a beaker filled with 100mL of deionized water. When the water temperature of the water bath is heated to 80°C, put the beaker into the water bath, heat and stir in the water bath until fully dissolved. Afterwards, the mixed solution was dried in an oven at 80° C., and then ground to obtain the recrystallization precursor A. Put the precursor A into the crucible, and in the tube furnace, under the protection of nitrogen, first heat up to 550°C at a heating rate of 5°C / min, then perform the first high-temperature calcination at 550°C, calcine for 4h, and cool to room temperature. Then, in the air environment, after heating up to 550°C at a heating rate of 5°C / min, a second high-temperature calcination was carried out at 550°C, calcined for 2 hours, and cooled naturally to obtain pure g-C 3 N 4 .

[0029] 2) Dissolve 0.44g of zinc acetate i...

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Abstract

The invention discloses a ZnO/g-C3N4 composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing nitrogen-rich organicmatter and deionized water, performing heating in a water bath at 30-90 DEG C, after full stirring is performed, putting the stirred material into an oven, performing drying, performing grinding, performing primary high-temperature calcination on the obtained precursor A in a nitrogen environment, performing secondary high-temperature calcination in an air environment, performing cooling, and performing grinding to obtain g-C3N4; dissolving zinc acetate into methanol, performing titration by using an alkaline solution, after a precipitate is completely precipitated, performing centrifugation,performing washing, performing drying, and performing high-temperature calcination on the obtained precursor B to obtain ZnO; and performing ultrasonic mixing on the ZnO and the g-C3N4 for 0.5-3 h, adjusting the pH of the solution to 4-10 to form the ZnO/g-C3N4 composite photocatalyst. According to the method provided by the invention, the ZnO/g-C3N4 composite photocatalyst prepared by the methodcan effectively separate electron hole pairs and reduce a recombination rate of electron holes, so that the photocatalytic activity is effectively improved.

Description

technical field [0001] The invention belongs to the field of photocatalyst technology, in particular to ZnO / g-C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique [0002] With the development of human society, the combustion of fossil fuels has caused a series of serious environmental problems, and the acquisition and conversion of solar energy into usable energy has become a key issue for human society. Photocatalytic technology is a sustainable and environmentally friendly technology. It uses sunlight to degrade organic pollutants. It has the characteristics of no secondary pollution and recyclable regeneration. In recent years, metal and non-metal composite materials have received extensive attention from researchers. ZnO is a low-cost metal oxide semiconductor with good electron transfer ability and strong oxidation holes under electromagnetic irradiation. Despite its many advantages, it also has certain limitations, such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72C07C45/39C07C49/08
CPCB01D53/8668B01D2257/704B01J27/24B01J35/004C07C45/39C07C49/08
Inventor 范晓星成祥祥马静怡李林丽杨媛
Owner LIAONING UNIVERSITY
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