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ZnOxSy photocatalyst with high visible light hydrogen production activity and preparation method thereof

A photocatalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problem of low visible light activity, achieve good visible light absorption, improve reaction efficiency and stability, and photogenerate electrons -Effect of fast hole transfer

Pending Publication Date: 2022-03-18
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low visible light activity of zinc catalysts in the prior art, the purpose of the present invention is to provide a ZnOxSy photocatalyst preparation method with high visible light hydrogen production activity

Method used

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  • ZnOxSy photocatalyst with high visible light hydrogen production activity and preparation method thereof
  • ZnOxSy photocatalyst with high visible light hydrogen production activity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Dissolve 1mmol of zincite (0.549g) and 4mmol of thiourea in 30mL of deionized water, and ultrasonically disperse for 30 minutes; then transfer the mixture to 100mL of polytetrafluoroethylene lining, and place the polytetrafluoroethylene lining Put it into a stainless steel hydrothermal kettle, and place the hydrothermal kettle in an oven at 160°C to react for 24 hours; after the reaction, it is naturally cooled to room temperature, and the product is separated by filtration, and mixed with ethanol and deionized water with a volume ratio of 1:1 The solution was washed 3 times, and the solid product was dried in an oven at 60°C for 12 hours to obtain a composite catalyst precursor; then the composite catalyst precursor was placed in a tube furnace, and the temperature was raised at a heating rate of 2°C / min to Heat treatment at 400° C. for 2 h; after the reaction, cool to room temperature under nitrogen protection to obtain the ZnOxSy photocatalyst.

Embodiment 2

[0028] Dissolve 1mmol of zincite (0.549g) and 6mmol of thiourea in 30mL of deionized water, and ultrasonically disperse for 30 minutes; then transfer the mixture to 100mL of polytetrafluoroethylene lining, and place the polytetrafluoroethylene lining Put it into a stainless steel hydrothermal kettle, and place the hydrothermal kettle in an oven at 160°C to react for 24 hours; after the reaction, it is naturally cooled to room temperature, and the product is separated by filtration, and mixed with ethanol and deionized water with a volume ratio of 1:1 The solution was washed 3 times, and the solid product was dried in an oven at 60°C for 24 hours to obtain a composite catalyst precursor; then the composite catalyst precursor was placed in a tube furnace, and the temperature was raised at a heating rate of 5°C / min to Heat treatment at 400° C. for 2 h; after the reaction, cool to room temperature under nitrogen protection to obtain the ZnOxSy photocatalyst.

Embodiment 3

[0030] Dissolve 1mmol of zincite (0.549g) and 5mmol of thiourea in 30mL of deionized water, and ultrasonically disperse for 30 minutes; then transfer the mixture to 100mL of polytetrafluoroethylene lining, and place the polytetrafluoroethylene lining Put it into a stainless steel hydrothermal kettle, and place the hydrothermal kettle in an oven at 140°C to react for 48 hours; after the reaction, it is naturally cooled to room temperature, and the product is separated by filtration, and mixed with ethanol and deionized water with a volume ratio of 1:1 The solution was washed 3 times, and the solid product was dried in an oven at 60°C for 36 hours to obtain a composite catalyst precursor; then the composite catalyst precursor was placed in a tube furnace, and the temperature was raised to 10°C / min under the protection of nitrogen to Heat treatment at 450° C. for 2 hours; after the reaction, cool to room temperature under nitrogen protection to obtain the ZnOxSy photocatalyst.

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Abstract

The invention provides a ZnOxSy photocatalyst with high visible light hydrogen production activity and a preparation method of the ZnOxSy photocatalyst. The preparation method of the ZnOxSy photocatalyst comprises the following steps: carrying out high-temperature hydrothermal reaction on hydrozincite and thiourea in an aqueous solution to form a Zn-O-S compound; and further performing heat treatment to obtain the ZnOxSy photocatalyst with a stable structure. The composite photocatalyst prepared by the method is stable in structure, has good visible light absorption and fast photo-induced electron-hole transfer capability, has high activity of photocatalytic decomposition of water to prepare hydrogen, and has a wide application prospect. Equipment used in the method is simple, raw materials are cheap and easy to obtain, the technological process is simple and environment-friendly, and the method has industrial production value.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a ZnOxSy photocatalyst with high visible light hydrogen production activity and a preparation method thereof. Background technique [0002] Zinc sulfide and zinc oxide belong to wide bandgap width, can only use the ultraviolet part of sunlight, and have low photocatalytic activity. In addition, even if it has certain activity under ultraviolet light, there are obvious shortcomings. On the one hand, the recombination of photogenerated carriers in pure ZnO or ZnS will lead to low photocatalytic quantum efficiency; on the other hand, photocatalytic During the process, ZnS will be oxidized by photogenerated holes to cause photocorrosion, resulting in poor catalyst stability. Therefore, compound modification of these semiconductor materials to promote the effective separation of photogenerated electrons and holes and the rapid and efficient transfer of photogenerated holes is the key to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02B01J27/04C01B3/04
CPCB01J27/02B01J27/04C01B3/042B01J35/39Y02E60/36
Inventor 彭峰植亚青张巧
Owner GUANGZHOU UNIVERSITY
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