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Synthesization method for porous zinc oxide nano piece loaded high-dispersion nanometer precious metal gas sensitive composite

A technology of porous zinc oxide and gas-sensing materials, which is applied in the field of synthesis of porous zinc oxide nanosheets loaded with highly dispersed nano-precious metal composite gas-sensing materials. Low surface area and other problems, to achieve the effect of uniform pore distribution, good repeatability, and large specific surface area

Inactive Publication Date: 2017-03-29
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many methods for detecting VOCs, such as gas chromatography, infrared method, SPR photodiode detection method, gravimetric chemical sensor method, catalytic combustion sensor method, photoionization detector method, etc. However, these methods have some shortcomings: analysis and detection The hysteresis is not conducive to online detection; the sample pretreatment and detection procedures are more complicated
The method for preparing noble metal-doped zinc oxide nanopowder in this invention has easy-to-obtain raw materials and simple operation, and is suitable for the field of photocatalytic treatment of organic sewage; however, the product prepared by this invention has a low specific surface area, requires the use of organic solvents, and has a high treatment temperature

Method used

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  • Synthesization method for porous zinc oxide nano piece loaded high-dispersion nanometer precious metal gas sensitive composite
  • Synthesization method for porous zinc oxide nano piece loaded high-dispersion nanometer precious metal gas sensitive composite
  • Synthesization method for porous zinc oxide nano piece loaded high-dispersion nanometer precious metal gas sensitive composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for synthesizing a highly dispersed nano-noble metal composite gas-sensing material loaded with porous zinc oxide nanosheets, comprising the following steps:

[0048] (1) Add 20ml 0.2mol / L zinc acetate aqueous solution to 20ml 0.4mol / L urea aqueous solution, ultrasonically disperse for 10min, then transfer the mixed solution to a 50mL stainless steel autoclave lined with polytetrafluoroethylene , and make it react in an oven at 120°C for 5h. Naturally cool to room temperature, centrifuge and wash with deionized water for 3 times, put in an oven and dry at 60°C for 12 hours to obtain basic zinc carbonate;

[0049] (2) Soak 0.2g of basic zinc carbonate in 20mL of chloroauric acid aqueous solution with a mass concentration of 1wt%, and stir at room temperature in the dark for 12h to obtain a precipitate-containing reaction solution;

[0050] (3) The precipitate in the reaction solution obtained in step (2) was centrifuged and washed, dried in an oven at 60° C. fo...

Embodiment 2

[0055] As described in Example 1, the difference is that a chloroauric acid aqueous solution with a mass concentration of 3 wt% is used in step (2).

[0056] In the prepared porous zinc oxide nanosheet-loaded highly dispersed nano-gold composite gas-sensing material, the particle size of the nano-gold is about 5nm, and the loading amount is about 2wt%.

[0057] figure 2 The transmission electron microscope photographs of the porous zinc oxide nanosheets loaded with highly dispersed nano-gold composite gas-sensing materials prepared for this example show that the nano-gold particles are not agglomerated on the surface of the porous zinc oxide, and are evenly distributed and uniform in size.

[0058] Figure 8 The X-ray diffraction spectrum of the porous zinc oxide nanosheet loaded highly dispersed nano-gold composite gas-sensing material prepared for this example, as can be seen from the figure, except for the diffraction peak of wurtzite zinc oxide (corresponding standard ca...

Embodiment 3

[0060] As described in Example 1, the difference is that the aqueous solution of chloroauric acid with a mass concentration of 5 wt% is used in step (2).

[0061] In the prepared porous zinc oxide nanosheet-loaded highly dispersed nano-gold composite gas-sensing material, the particle size of the nano-gold is about 10 nm, and the loading amount is about 5 wt%.

[0062] image 3 The transmission electron microscope photographs of the porous zinc oxide nanosheets loaded with highly dispersed nano-gold composite gas-sensing materials prepared for this example show that the nano-gold particles are not agglomerated on the surface of the porous zinc oxide, and are evenly distributed and uniform in size.

[0063] Figure 9 The X-ray diffraction spectrum of the porous zinc oxide nanosheet loaded highly dispersed nano-gold composite gas-sensing material prepared for this example, as can be seen from the figure, except for the diffraction peak of wurtzite zinc oxide (corresponding stan...

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Abstract

The invention relates to a synthesization method for a porous zinc oxide nano piece loaded high-dispersion nanometer precious metal gas sensitive composite. The synthesization method comprises the following steps that (1) basic zinc carbonate is immersed into a precious metal ion water solution, stirring is conducted away from light, and a reaction solution containing sediment is obtained; and (2) the sediment in the reaction solution obtained in the step (1) is subjected to centrifugal washing, drying and calcination, and the gas sensitive composite is obtained. The gas sensitive material can be used for gas sensitive sensing detection of volatile organic pollutants (VOCs and chlorobenzene gas), the gas sensitive response is good, the material synthesization method is environmentally friendly, simple, convenient and good in repeatability, and mass production and application to gas sensing detection can be easily achieved.

Description

technical field [0001] The invention relates to a method for synthesizing a highly dispersed nano-precious metal composite gas-sensing material loaded with porous zinc oxide nanosheets, and belongs to the field of inorganic nano-material preparation. Background technique [0002] Indoor air quality researchers claim that all the volatile organic compounds they sampled and analyzed indoors are VOCs, and volatile organic compounds (VOCs) are the most serious of the three types of indoor air pollutants. As people spend more time indoors, the relationship between the indoor environment and people becomes closer and more important. There are many methods for detecting VOCs, such as gas chromatography, infrared method, SPR photodiode detection method, gravimetric chemical sensor method, catalytic combustion sensor method, photoionization detector method, etc. However, these methods have some shortcomings: analysis and detection The hysteresis is not conducive to online detection;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00C01G9/03B82Y30/00B82Y40/00B22F1/0545
CPCB82Y30/00B82Y40/00C01G9/03B22F9/22C01P2002/72C01P2004/04C01P2004/64B22F1/0545
Inventor 占金华封振宇韩雪马妍星
Owner SHANDONG UNIV
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