Preparation method of silver/graphene/zinc oxide composite material capable of degrading formaldehyde

A composite material and graphene technology, applied in chemical instruments and methods, botanical equipment and methods, catalyst activation/preparation, etc., to achieve enhanced photocatalytic activity, effective energy conversion, and improved charge separation

Active Publication Date: 2017-12-22
苏州湘淮环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing popular photocatalysts on the market can only function under the condition of ultraviolet rays, or use hybridization methods, such as nitrogen hybridization, to change the position of the conduction band, so that visible light can be absorbed for photocatalysis

Method used

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  • Preparation method of silver/graphene/zinc oxide composite material capable of degrading formaldehyde

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Embodiment 1

[0031] A kind of preparation method of the Ag / graphene / ZnO composite material that can degrade formaldehyde comprises the following steps:

[0032] (1) Preparation of nano ZnO particles: Measure 50 mL of 1 mol / L Zn(NO3) 2 solution into a 200 ml beaker, and add 50 mL of 2 mol / L NaOH solution while stirring. Let stand for a day. The resulting precipitate was filtered, washed, and dried in an oven at 80°C. The dried precipitate was roasted in a muffle furnace for 3 h. ZnO nanoparticles can be obtained by grinding after cooling;

[0033] (2) Preparation of Ag / graphene / ZnO: Ag nanoparticles are uniformly dispersed on the ZnO nanoparticles obtained in step (1) by physical vapor deposition to form Ag / ZnO composite nanoparticles. In the physical vapor deposition process, first Vacuumize to 0.05 Pa, and keep the vacuum degree not lower than 0.1Pa, the mass ratio of ZnO and Ag is 20:1; then use Ag / ZnO composite nanoparticles as the matrix, methane as the carbon source, at an air pres...

Embodiment 2

[0037] A kind of preparation method of the Ag / graphene / ZnO composite material that can degrade formaldehyde comprises the following steps:

[0038] (1) Preparation of nano ZnO particles: Measure 50 mL of 1 mol / L Zn(NO3) 2 solution into a 200 ml beaker, and add 50 mL of 2 mol / L NaOH solution while stirring. Let stand for a day. The resulting precipitate was filtered, washed, and dried in an oven at 80°C. The dried precipitate was roasted in a muffle furnace for 3 h. ZnO nanoparticles can be obtained by grinding after cooling;

[0039] (2) Preparation of Ag / graphene / ZnO: Ag nanoparticles are uniformly dispersed on the ZnO nanoparticles obtained in step (1) by physical vapor deposition to form Ag / ZnO composite nanoparticles. In the physical vapor deposition process, first Vacuumize to 0.05 Pa, and keep the vacuum degree not lower than 0.1Pa, the mass ratio of ZnO and Ag is 20:1; then use Ag / ZnO composite nanoparticles as the matrix, methane as the carbon source, at an air pres...

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Abstract

The invention discloses a preparation method of a silver / graphene / zinc oxide composite material capable of degrading formaldehyde. The preparation method is characterized by comprising the following steps: (1) preparing ZnO nanoparticles; (2) uniformly dispersing Ag nanoparticles on the ZnO nanoparticles through physical vapor deposition; embedding graphene into an Ag / ZnO nano composite structure in a chemical vapor deposition manner to form Ag / graphene / ZnO composite nanoparticles; furthermore, mixing the Ag / graphene / ZnO composite nanoparticles prepared by step (2) with coconut shell active carbon and polyethylene; sintering to obtain sintered active carbon particles rich in Ag / graphene / ZnO composite nanoparticles. According to the Ag / graphene / ZnO composite material prepared by the preparation method, the technical bottleneck that an existing product only can have a photocatalysis effect under ultraviolet light is broken through a surface plasma resonance effect of the silver nanoparticles under visible light; the Ag / graphene / ZnO composite material has the advantages of good photocatalysis effect, simplicity and high efficiency.

Description

technical field [0001] The present application relates to a method for preparing a photocatalyst, in particular to a method for preparing a silver / graphene / zinc oxide composite material capable of degrading formaldehyde. Background technique [0002] Photocatalytic technology using semiconductor nanomaterials titanium dioxide TiO 2 As a representative, it can catalyze and decompose bacteria and pollutants by using natural light. It has the characteristics of high catalytic activity, good chemical stability and thermal stability, no secondary pollution, non-irritating, safe and non-toxic, and can benefit the ecology for a long time. The natural environment is one of the most promising green catalysts. [0003] Zinc oxide ZnO is a new wide band gap and high excitation energy semiconductor material with excellent performance. Its special electronic structure makes it have excellent electrical, magnetic and optical effects. Compared with titanium dioxide, zinc oxide has the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J37/08B01J37/02B01J37/34A01N59/16A01P1/00A01P3/00B01D53/86B01D53/72C23C28/00C23C14/18C23C14/22C23C16/26C23C16/44
CPCA01N59/16B01D53/8668B01J23/60B01J35/004B01J37/0221B01J37/084B01J37/088B01J37/342C23C14/18C23C14/223C23C16/26C23C16/4417C23C28/322C23C28/34Y02C20/20
Inventor 马林
Owner 苏州湘淮环境科技有限公司
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