A gas sensitive material used for monitoring ammonia gas emission for environment and a preparation method thereof

A gas-sensitive material and environmental monitoring technology, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve problems such as poor long-term stability, poor selectivity, and the influence of ammonia environment temperature and humidity, and achieve accurate measurement and Effects of control, improvement of detection ability, and ease of industrialization development

Inactive Publication Date: 2018-11-09
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of existing ammonia detection such as being easily affected by ambient temperature and humidity, poor long-term stability, and poor selectivity, the present invention uses a gas-sensitive material and a preparation method for environmental monitoring of ammonia emissions. The combination of vanadium pentoxide nanotube fibers and conductive polymer polyaniline greatly improves the sensitivity of ammonia detection

Method used

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  • A gas sensitive material used for monitoring ammonia gas emission for environment and a preparation method thereof
  • A gas sensitive material used for monitoring ammonia gas emission for environment and a preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] (1) Weigh polyvinylpyrrolidone and absolute ethanol at a mass ratio of 3:7, add the polyvinylpyrrolidone to the absolute ethanol, set the stirring speed to 200rpm, and stir at a constant speed to obtain Solution A;

[0033] (2) Weigh the soluble vanadium salt and N,N-dimethylformamide according to the mass ratio of 1:9, add the soluble vanadium salt to the N,N-dimethylformamide, set the stirring The speed is 200rpm, stirring at a constant speed to obtain solution B;

[0034] (3) Mix solution A and solution B with a volume ratio of 1:2, pour the solution A into the solution B, then add a nitric acid solution with a concentration of 0.5mol / L and stir to obtain vanadium pentoxide Precursor solution; the amount added is 2% of the total mass of solution A and solution B.

[0035] (4) Add the precursor solution of vanadium pentoxide obtained in step (3) into the electrospinning equipment, and through the electrospinning process, use an air pump to advance at a speed of 0.3mL / ...

Embodiment 2

[0039] (1) Weigh polyvinylpyrrolidone and absolute ethanol at a mass ratio of 4:6, add the polyvinylpyrrolidone into the absolute ethanol, set the stirring speed to 100rpm, and stir at a constant speed to obtain Solution A;

[0040] (2) Weigh the soluble vanadium salt and N,N-dimethylformamide according to the mass ratio of 2:8, add the soluble vanadium salt to the N,N-dimethylformamide, set stirring The speed is 100rpm, stirring at a constant speed to obtain solution B;

[0041] (3) Mix solution A and solution B with a volume ratio of 1:3, pour the solution A into the solution B, then add a nitric acid solution with a concentration of 1.0 mol / L and stir to obtain vanadium pentoxide Precursor solution; the amount added is 2% of the total mass of solution A and solution B.

[0042] (4) Add the precursor solution of vanadium pentoxide obtained in step (3) to the electrospinning equipment, and through the electrospinning process, use an air pump to advance at a speed of 0.45mL / ...

Embodiment 3

[0046] (1) Weigh polyvinylpyrrolidone and absolute ethanol according to a mass ratio of 3:6.5, add the polyvinylpyrrolidone into the absolute ethanol, set the stirring speed to 80rpm, and stir at a constant speed to obtain Solution A;

[0047] (2) Weigh the soluble vanadium salt and N,N-dimethylformamide according to the mass ratio of 2:9, add the soluble vanadium salt to the N,N-dimethylformamide, set the stirring The speed is 80rpm, stirring at a constant speed to obtain solution B;

[0048] (3) Mix solution A and solution B with a volume ratio of 1-3:2-4, pour the solution A into the solution B, then add a nitric acid solution with a concentration of 0.9mol / L and stir to obtain five Precursor solution of vanadium oxide; the amount added is 2% of the total mass of solution A and solution B.

[0049] (4) Add the vanadium pentoxide precursor solution obtained in step (3) into the electrospinning equipment, and through the electrospinning process, use an air pump to advance a...

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Abstract

A gas sensitive material used for monitoring ammonia gas emission for environment and a preparation method thereof are disclosed. Firstly, a vanadium pentoxide precursor solution is prepared; then polyvinylpyrrolidone / vanadium pentoxide composite nanometer fibers are prepared through electrostatic spinning; vanadium pentoxide nanotube fibers are prepared through calcining treatment; finally a surfactant and the vanadium pentoxide nanotube fibers are added into a water solution separately; after stirring, an aniline monomer is added into the solution; the solution is stirred; a FeCl3 aqueous solution is finally added; the mixture is reacted under stirring; and the polyaniline / vanadium pentoxide nanotube composite gas sensitive material is prepared after filtration and cleaning. The method overcomes a defect that present ammonia gas detection is susceptible to environment temperature and humidity, poor in long-term stability, poor in selectivity, and the like. The vanadium pentoxide nanotube fibers and an electrically conductive polymer that is the polyaniline are composited and are synergistic, thus greatly increasing ammonia gas detection sensitivity.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a gas-sensitive material and a preparation method for environmental monitoring of ammonia emission. Background technique [0002] Ammonia is a colorless gas with a strong pungent odor. It has a corrosive and stimulating effect on the tissues it contacts, denatures tissue proteins, saponifies tissue fats, and destroys cell membranes with extremely high solubility. Therefore, it mainly stimulates and corrodes the upper respiratory tract of the human body and weakens the body's resistance to diseases. In addition, ammonia can also cause cardiac arrest and respiratory arrest through the reflex action of the trigeminal nerve endings. It is of great significance to monitor the concentration of ammonia in the environment. The detection of ammonia is mainly used in chemical plants, cold storage, intelligent public toilets and aquaculture, etc. [0003] A sensor is a device or device that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 陈庆司文彬
Owner CHENDU NEW KELI CHEM SCI CO LTD
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