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Preparation method of Ag/ ZnO composite material capable of degrading formaldehyde

A composite material and formaldehyde technology, which is applied in the field of photocatalyst preparation to achieve the effects of improving photocatalytic effect, improving photocatalytic activity and improving charge separation

Active Publication Date: 2017-11-24
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 Ag/ ZnO composite material capable of degrading formaldehyde

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Embodiment 1

[0030] A kind of preparation method of the Ag / ZnO composite material that can degrade formaldehyde comprises the following steps:

[0031] (1) Preparation of nano-ZnO particles: Measure 50 mL of a 1mol / L Zn(NO3)2 solution into a 200ml beaker, and add 50mL of a 2mol / 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;

[0032] (2) Preparation of Ag / ZnO: uniformly disperse Ag nanoparticles on the ZnO nanoparticles made in step (1) by physical vapor deposition to form Ag / ZnO composite nanoparticles. In the physical vapor deposition process, first evacuate to 0.05 Pa, and keep the vacuum not lower than 0.1Pa, the mass ratio of ZnO and Ag is 20:1.

[0033] The Ag / ZnO composite nanoparticles prepared in this example were placed in a reactor to conduct a formaldehyde treatment test...

Embodiment 2

[0036] A kind of preparation method of the Ag / ZnO composite material that can degrade formaldehyde comprises the following steps:

[0037] (1) Preparation of nano-ZnO particles: Measure 50 mL of a 1mol / L Zn(NO3)2 solution into a 200ml beaker, and add 50mL of a 2mol / 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;

[0038](2) Preparation of Ag / ZnO: uniformly disperse Ag nanoparticles on the ZnO nanoparticles made in step (1) by physical vapor deposition to form Ag / ZnO composite nanoparticles. In the physical vapor deposition process, first evacuate to 0.05 Pa, and keep the vacuum not lower than 0.1Pa, the mass ratio of ZnO and Ag is 20:1;

[0039] (3) Mix the Ag / ZnO composite nanoparticles prepared in step (2) with coconut shell activated carbon and polyethylene, wherein ...

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Abstract

The invention discloses a preparation method of Ag / ZnO composite material capable of degrading formaldehyde. The preparation method comprises the following steps: (1) preparing ZnO nanoparticles; and (2) preparing Ag / ZnO, namely, uniformly dispersing Ag nanoparticles on the ZnO nanoparticles obtained in step (1) by physical vapor deposition so as to obtain the Ag / ZnO composite nanoparticles. The method further comprises the step (3) of mixing the Ag / ZnO composite nanoparticles prepared in step (2), coconut shell activated carbon and polyethylene, and then sintering to obtain sintered activated carbon particles rich in Ag / ZnO nanoparticles. The surface plasma resonance effect of the Ag / ZnO composite material in visible light under silver nanoparticles breaks the technical bottleneck that an existing product can realize photocatalysis effect under ultraviolet light; the Ag / ZnO composite material has a good photocatalysis effect, and is simple and efficient.

Description

technical field [0001] The present application relates to a preparation method of a photocatalyst, in particular to a preparation method of an Ag / ZnO 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 same bandgap width ...

Claims

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Application Information

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IPC IPC(8): B01J23/60B01D53/86B01D53/72
CPCB01D53/007B01D53/8668B01J23/60B01D2258/06B01J35/39
Inventor 马林
Owner 苏州湘淮环境科技有限公司
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