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Novel sampling strip for detecting PM2.5 concentration in environment

A detection environment, a new type of technology, applied in the direction of sampling, measuring devices, sampling devices, etc., can solve the problems of low detection sensitivity of PM2.5 particles, poor adsorption capacity of PM2.5 particles, etc., and achieve the goal of improving the attenuation effect and enhancing the adsorption capacity Effect

Pending Publication Date: 2021-09-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the materials in the prior art have strong absorption of beta rays and poor adsorption capacity for PM2.5 particles, so the detection sensitivity of PM2.5 particles is low, the present invention provides a new type of The sampling strip used to detect the concentration of PM2.5 in the environment, using graphene as the adsorption layer, has high detection sensitivity and strong suitability for PM2.5 particles

Method used

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  • Novel sampling strip for detecting PM2.5 concentration in environment
  • Novel sampling strip for detecting PM2.5 concentration in environment
  • Novel sampling strip for detecting PM2.5 concentration in environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the first step, take 200 mg of graphene powder and add it to 100 ml of deionized water, and use an ultrasonic machine with a power of 40w to ultrasonically disperse it into a dispersion of 2 mg / ml.

[0034] The second step is to select a set of suction filter device, and put a layer of filter paper on the funnel in the filter device.

[0035] In the third step, take a section of PET coarse filter and superimpose it on the filter paper in the second step in a single-layer structure.

[0036] In the fourth step, pour 100ml of the 2mg / ml dispersion prepared in the first step into the funnel and use a differential pump to perform suction filtration. After the suction filtration is completed, remove the filter paper to obtain a PET coarse filter with graphene.

[0037] The fifth step is to put the PET coarse filter with graphene obtained in the fourth part into an oven and bake at 150 degrees Celsius for 30 minutes for drying treatment. The adsorption layer is 80 microns,...

Embodiment 2

[0039] In the first step, take 25 mg of graphene oxide powder and add it to 100 ml of deionized water, and use an ultrasonic machine with a power of 40w to ultrasonically disperse it into a dispersion of 0.25 mg / ml.

[0040] The second step is to select a set of suction filter device, and put a layer of filter paper on the funnel in the filter device.

[0041] In the third step, take a section of glass fiber coarse filter paper and superimpose it on the filter paper in the second step in a single-layer structure.

[0042] In the fourth step, pour 100ml of the 0.25mg / ml dispersion prepared in the first step into the funnel and use a differential pump to perform suction filtration. After the suction filtration is completed, remove the filter paper to obtain a glass fiber coarse filter paper with graphene oxide.

[0043] In the fifth step, the glass fiber coarse filter paper with graphene oxide obtained in the fourth part is put into an oven and baked at 150 degrees Celsius for 3...

Embodiment 3

[0045] In the first step, take 125 mg of graphene oxide powder and add it to 100 ml of deionized water, and use an ultrasonic machine with a power of 40w to ultrasonically disperse it into a dispersion liquid of 1.25 mg / ml.

[0046] The second step is to select a set of suction filter device, and put a layer of filter paper on the funnel in the filter device.

[0047] In the third step, take a section of glass fiber coarse filter paper and superimpose it on the filter paper in the second step in a single-layer structure.

[0048] In the fourth step, pour 100ml of the 1.25mg / ml dispersion prepared in the first step into the funnel and use a differential pump to perform suction filtration. After the suction filtration is completed, remove the filter paper to obtain a glass fiber coarse filter paper with graphene oxide.

[0049] In the fifth step, the glass fiber coarse filter paper with graphene oxide obtained in the fourth part is put into an oven and baked at 150 degrees Celsi...

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Abstract

The invention relates to the field of small particle detection, in particular to a preparation and use method of a novel sampling strip for detecting PM2.5 concentration in an environment. The composition structure of the novel PM2.5 concentration sampling strip comprises an adsorption layer and a substrate layer. The adsorption layer is attached to the substrate layer in a suction filtration manner by virtue of multiple layers of graphene or graphene oxide, and is used for the dust detector by virtue of the Beta ray attenuation method. The sampling strip has high PM2.5 adsorption capacity and high Beta ray transmittance, so that the service life of the sampling strip can be prolonged, and the PM2.5 detection accuracy can be improved.

Description

technical field [0001] The invention relates to a tiny particle detection technology, which belongs to the technical field of environmental detection. Background technique [0002] PM2.5 refers to particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. PM2.5 has a small particle size, is likely to be accompanied by toxic and harmful substances, and stays in the atmosphere for a long time, so it has a major impact on human health and the quality of the atmospheric environment. In the new "Ambient Air Quality Standards" implemented in 2016, PM2.5 has become a necessary statistical object of the air pollution index. [0003] At present, there are three methods for calculating PM2.5 in the air: gravimetric method, beta ray attenuation method and micro-vibration balance method. These three methods all need to pass a certain volume of the gas to be tested to trap PM2.5 in the filter membrane, and then count the number of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22
CPCG01N1/2214G01N1/2273
Inventor 国洪轩张桎豪徐涛孙立涛
Owner SOUTHEAST UNIV
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