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Composite gas-sensitive material with high sensitivity and high selectivity on acetic acid gas

A gas-sensing material and high-sensitivity technology, applied in the field of composite gas-sensing materials, can solve the problems of expensive and time-consuming, and achieve the effects of rapid detection, short response and recovery time, and improved sensitivity and selectivity

Active Publication Date: 2018-12-14
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for measuring the concentration of acetic acid in the air mainly use gas chromatography and ion chromatography, etc. These methods require relatively expensive instruments and equipment, and sampling and analysis take a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 0.0080g of g-C 3 N 4 (g-C 3 N 4 Accounting for the mass ratio of composite material is 8wt%), add in the methanol of 80ml, ultrasonic dispersion 1 hour, obtain g-C 3 N 4 suspension. Add 0.0920 g of SnO to the suspension while stirring 2 , stirred in a fume hood for 12 hours until the methanol was completely volatilized, and the obtained precipitate was baked in an oven at 80° C. for 24 hours to obtain a composite material.

[0018] The material is made into a side-heating element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetic acid gas at 185°C is measured to be 1.1, 1.5, 4.2, 6.8, 11.4, 35.0; to 1000ppm acetone The sensitivity of formaldehyde, ethanol, acetaldehyde and ammonia is below 3.5; the response time and recovery time to 0.1ppm acetic acid are not more than 16 seconds.

Embodiment 2

[0020] Weigh 0.0100g of g-C 3 N 4 (g-C 3 N 4 Accounting for the mass ratio of composite material is 10wt%), add in the methanol of 80ml, ultrasonic dispersion 1 hour, obtain g-C 3 N 4 suspension. Add 0.0900 g of SnO to the suspension while stirring 2 , stirred in a fume hood for 12 hours until the methanol was completely volatilized, and the obtained precipitate was baked in an oven at 80° C. for 24 hours to obtain a composite material.

[0021] The material is made into a side-heating element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetic acid gas at 185°C is measured to be 1.2, 1.6, 4.8, 12.4, 28.3, 88.5 respectively; to 1000ppm acetone The sensitivity of formaldehyde, ethanol, acetaldehyde and ammonia is below 8; the response time and recovery time to 0.1ppm acetic acid are not more than 15 seconds.

Embodiment 3

[0023] Weigh 0.0110g of g-C 3 N 4 (g-C 3 N 4 Accounting for the mass ratio of composite material is 11wt%), add in the methanol of 80ml, ultrasonic dispersion 1 hour, obtain g-C 3 N 4 suspension. Add 0.0890 g of SnO to the suspension while stirring 2 , stirred in a fume hood for 12 hours until the methanol was completely volatilized, and the obtained precipitate was baked in an oven at 80° C. for 24 hours to obtain a composite material.

[0024] The material is made into a side-heating element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetic acid gas at 185°C is measured to be 1.3, 1.8, 4.6, 10.1, 22.2, 40.2; to 1000ppm acetone The sensitivity of formaldehyde, ethanol, acetaldehyde and ammonia is below 3.5; the response time and recovery time to 0.1ppm acetic acid are not more than 18 seconds.

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PUM

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Abstract

The invention discloses a composite gas-sensitive material with high sensitivity and high selectivity on acetic acid gas, and belongs to the technical field of gas-sensitive materials. The composite gas-sensitive material consists of C3N4-SnO2, wherein the mass of C3N4 accounts for 8-12% of the total mass of the material; a heater type gas-sensitive sensor is prepared by taking the material as a sensitive material; when the sensor works at a working temperature of 185 DEG C, the sensitivity to 0.1ppm acetic acid is 1.1-1.3; the sensitivity of an element to 1,000ppm of the acetic acid reaches 35-90, while the sensitivity to 1,000ppm of acetone, formaldehyde, ethanol, acetaldehyde and ammonia gas is 8 or below, thereby proving that sensitivity and the gas sensitivity selectivity of tin dioxide to the acetic acid gas are improved by virtue of C3N4; and in addition, the working temperature of the detection acetic acid gas sensor is reduced, the concentration of acetic acid in air can be rapidly detected, and gas interference such as acetone, formaldehyde, ethanol, acetaldehyde, ammonia gas and the like can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, and in particular relates to a composite gas-sensing material, which is used to make a gas sensor, and the gas sensor has high sensitivity and good selectivity to low-concentration acetic acid in the air. Background technique [0002] Acetic acid is a volatile, colorless liquid with a strong pungent smell. It is highly corrosive and can cause skin and mucous membranes to blister, redness, and swelling. When the concentration is high, it can cause rhinitis and bronchitis. In severe cases, acute chemical reactions may occur. pneumonia. The health standard of the United States, Japan and other countries is 25mg / m 3 (about 9.3ppm), my country has not formulated the limit value of acetic acid in the air of the workplace. The current methods for measuring the concentration of acetic acid in the air mainly use gas chromatography and ion chromatography, etc. These methods require relative...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 储向峰刘俊松董永平白林山
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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