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A graphene phase carbon nitride carbon oxide tin oxide composite material for near-room temperature gas-sensitive selective detection of organic pollutants, its preparation method and application

A technology of olefinic carbon nitride and composite materials, which is applied in the fields of tin oxide, material separation, and analysis of materials, can solve the problems of undiscovered, high detection temperature, and poor selectivity, so as to improve selectivity, not easy to fall off, and reduce high temperature The effect of testing requirements

Active Publication Date: 2018-06-05
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As the most widely used gas-sensing material at present, tin dioxide has the advantages of high sensitivity, long life, good stability, and corrosion resistance. However, it also has shortcomings such as high detection temperature and poor selectivity, which need to be solved urgently.
[0005] After searching, no report was found on the graphene phase carbon nitride carbon oxide tin oxide composite material applied to near room temperature gas-sensitive selective detection of aldehyde volatile organic pollutants

Method used

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  • A graphene phase carbon nitride carbon oxide tin oxide composite material for near-room temperature gas-sensitive selective detection of organic pollutants, its preparation method and application
  • A graphene phase carbon nitride carbon oxide tin oxide composite material for near-room temperature gas-sensitive selective detection of organic pollutants, its preparation method and application
  • A graphene phase carbon nitride carbon oxide tin oxide composite material for near-room temperature gas-sensitive selective detection of organic pollutants, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of graphene phase carbon nitride oxide tin oxide composite material comprises steps as follows:

[0045](1) Disperse 0.184g graphene-phase carbon nitride into 30ml ethanol, add 0.45g (2mmol) stannous chloride dihydrate, after stirring evenly, add 0.6ml concentrated hydrochloric acid (36.5wt%) dropwise, then add dropwise 2 mmol of sodium hypochlorite was stirred for 5 minutes, then transferred to a polytetrafluoroethylene autoclave, and kept at 180° C. for 24 hours. After the reaction was completed, it was cooled to room temperature, and the obtained white sample was washed with deionized water and absolute ethanol, and dried.

[0046] (2) Dry the product obtained in step (1) in a porcelain boat, place it in a muffle furnace, raise the temperature to 550°C at a heating rate of 5°C / min, and bake at a constant temperature for 2 hours. After automatic cooling, the composite material is obtained. The SEM figure of the graphene phase carbon nitride oxide tin...

Embodiment 2

[0048] As described in Example 1, the difference is:

[0049] In step (1), replace graphene phase carbon nitride with 0.092g thin-layer graphene phase carbon nitride. The SEM figure of the thin-layer graphene phase carbon nitride oxide tin oxide composite material that makes, as figure 2 shown. Depend on figure 2 It can be seen that the composite material is supported by thin-layer graphene-phase carbon nitride nanosheets and loaded with tin oxide nanospheres. The thickness of the thin-layer graphene-phase carbon nitride nanosheet is 1-10 nm, and the diameter of the tin oxide nano-sphere is 60-130 nm.

Embodiment 3

[0051] Gas-sensitive selective detection of volatile organic pollutant hexanal, including the following steps:

[0052] 1) Preparation of gas sensor

[0053] Grind the sample powder and ethanol solution prepared in Example 2 into a paste in an agate mortar, then apply it evenly on the alumina ceramic tube with a brush, and place it at 100°C to dry for 2 hours, and then place it on the Calcined at 400°C for 1 hour. Then, a Ni-Cr alloy wire that can generate heat was passed through the ceramic tube and aged at 450 °C for 120 hours.

[0054] 2) Gas sensitivity performance test

[0055] The performance of the gas sensor is evaluated by the HW-30A gas sensor tester produced by Henan Hanwei Company. The gas sensitive element prepared in step 1) is placed on the gas sensitivity tester, and the hexanal gas to be detected is fed into 100ppm. By calculating the sensitivity of the element (defined as Ra / Rg, where Ra and Rg are the resistance values ​​of the gas sensor in the air and ...

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Abstract

The invention relates to a graphene phase carbon nitride tin oxide compound material for near room-temperature air-sensitive selective detection of organic pollutants, a preparation method and an application. The compound material is a graphene phase carbon nitride nanometer slice loaded with tin oxide nanometer balls or a thin graphene phase carbon nitride nanometer slice loaded with tin oxide nanometer balls and is characterized by uniform loading, difficulty in falling off, and the like. The detection temperature of the graphene phase carbon nitride tin oxide compound material provided by the invention is at 20-600 DEG C; and different from the optimal detection temperature of tin oxide at 260 DEG C, the room temperature detection for aldehyde volatile organic pollutants can be realized, the high-temperature detection requirement for the traditional air-sensitive material can be reduced, and the energy consumption of the air-sensitive detection can be greatly reduced.

Description

technical field [0001] The invention relates to a graphene-phase carbon nitride carbon oxide tin oxide composite material used in near-room-temperature air-sensitive selective detection of volatile organic pollutants, a preparation method and application thereof, and belongs to the technical field of selective detection and analysis of organic pollutants. Background technique [0002] With the continuous acceleration of the industrialization process, the application of gas sensors is becoming more and more extensive, often used for atmospheric pollutants (including SO 2 , NO 2 , CO, etc.) and volatile organic pollutants, as well as the detection of leaked gas in the production process and the determination of indoor air pollutants in life, and it is used for the diagnosis of diseases in the medical field. Semiconductor metal oxide gas sensors have extremely broad application prospects because of their advantages such as high sensitivity, low energy consumption, and portabil...

Claims

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Application Information

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IPC IPC(8): G01N27/00C01G19/02G01N30/00B82Y30/00
CPCB82Y30/00C01G19/02C01P2004/03C01P2004/80G01N30/00
Inventor 占金华陈宵珍马希骋
Owner SHANDONG UNIV
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