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Cross-sensitive material for benzene, toluene and ethylbenzene

A cross-sensitive, toluene technology, applied in the field of sensing, can solve the problem of time-consuming and difficult to realize on-site

Inactive Publication Date: 2015-08-19
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the literature, chromatography and photometry are mainly used to determine benzene, toluene and ethylbenzene, and pre-enrichment and sample preparation are required for application, so it is time-consuming and difficult to implement on-site

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add natural flake graphite to concentrated sulfuric acid at a temperature of 1°C under continuous stirring, keep the temperature and stir for 1 hour, add sodium nitrate equal to the weight of natural flake graphite, and then add solid potassium permanganate 3 times the weight of natural flake graphite , continue to maintain the temperature and stir for 2 hours, raise the temperature to 46°C and continue to stir for 1 hour, add an appropriate amount of hydrogen peroxide with a mass fraction of 3% and raise the temperature to 70°C, maintain the temperature and stir for 1.5 hours, suction filter and wash the filtrate until neutral Finally, disperse in the hydrochloric acid aqueous solution with a mass fraction of 5% at a temperature of 31°C, add chloroauric acid, bismuth acetate, magnesium chloride hexahydrate, yttrium acetate tetrahydrate and isocitric acid respectively under high-speed stirring, and keep stirring continuously for 3 hours , add a hydrazine hydrate aqueous ...

Embodiment 2

[0016] Add natural flake graphite to concentrated sulfuric acid at a temperature of 2°C under continuous stirring, keep the temperature and stir for 2 hours, add sodium nitrate equal to the weight of natural flake graphite, and then add solid potassium permanganate 3 times the weight of natural flake graphite , continue to maintain the temperature and stir for 3 hours, raise the temperature to 48°C and continue to stir for 2 hours, add an appropriate amount of hydrogen peroxide with a mass fraction of 5% and raise the temperature to 71°C, maintain the temperature and stir for 1.5 hours, suction filter and wash the filtrate until neutral Finally, it was dispersed in an aqueous hydrochloric acid solution with a mass fraction of 8% at a temperature of 33°C, and under high-speed stirring, respectively added chloroauric acid, bismuth oxalate heptahydrate, magnesium sulfate heptahydrate, yttrium oxalate nonahydrate, yttrium phosphate and isocitric acid, Keep the temperature and stir ...

Embodiment 3

[0020] Add natural flake graphite to concentrated sulfuric acid at a temperature of 0°C under continuous stirring, keep the temperature and stir for 1 hour, add sodium nitrate equal to the weight of natural flake graphite, and then add solid potassium permanganate 3 times the weight of natural flake graphite , continue to keep the temperature and stir for 2 hours, raise the temperature to 50°C and continue to stir for 1 hour, add an appropriate amount of hydrogen peroxide with a mass fraction of 6% and raise the temperature to 73°C, keep the temperature and stir for 1.5 hours, suction filter and wash the filtrate until neutral Finally, disperse in the aqueous hydrochloric acid solution whose mass fraction is 7% at a temperature of 35°C, add chloroauric acid, bismuth nitrate pentahydrate, magnesium nitrate hexahydrate, yttrium oxalate, yttrium nitrate hexahydrate and isocitric acid respectively under high-speed stirring, Keep the temperature and stir continuously for 3 hours, ad...

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Abstract

A cross-sensitive material for benzene, toluene and ethylbenzene is a nanometer composite powder material composed of graphene supported Au, Bi2O3, MgO and Y2O3. A preparation method of the material comprises the following steps: adding natural flake graphite into concentrated sulfuric acid, stirring, adding sodium nitrate and potassium permanganate, heating, adding hydrogen peroxide, heating, stirring, carrying out pumping filtration, washing by using water, dispersing the obtained material in a hydrochloric acid solution, adding auric chloride acid, a bismuth salt, a magnesium salt, a yttrium and isocitric acid, stirring, adding hydrazine hydrate, reducing, adjusting the pH value by using ammonia water to obtain a precipitate, filtering the precipitate, drying, grinding, and roasting to obtain the nanometer composite powder material composed of graphene supported Au, Bi2O3, MgO and Y2O3. A gas sensor made by using the cross-sensitive material provided by the invention can be used to rapidly and accurately determine a tiny amount of benzene, toluene and ethylbenzene in air on the scene without interference by common concurrent.

Description

technical field [0001] The present invention relates to a kind of cross-sensitive material of benzene, toluene and ethylbenzene, especially graphene-supported Bi doped by gold atoms 2 o 3 , MgO and Y 2 o 3 The cross-sensitive material composed of the invention belongs to the field of sensing technology. Background technique [0002] Benzene is a colorless liquid with an aromatic smell. It is flammable and highly toxic. It is highly volatile at room temperature and has been identified as a carcinogen by the World Health Organization (WHO). Because benzene is highly volatile, the use of benzene or benzene-containing materials or furniture can cause a large amount of benzene vapor to diffuse into the environment and be inhaled into the body through breathing. Because benzene is fat-soluble, it can enter the human body through intact skin. Benzene vapor with a high concentration has an anesthetic effect, which can cause coma in a short period of time, acute benzene poisonin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 周考文谷春秀范慧珍雷殿
Owner BEIJING UNION UNIVERSITY
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