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Large-mesopore tungsten oxide hydrogen sulfide sensitive material with high specific area and preparation method thereof

A technology of high specific surface area and sensitive material, applied in the field of high specific surface area and large mesoporous tungsten oxide hydrogen sulfide sensitive material and its preparation, can solve the problems of low detection limit and high sensitivity, achieve low detection limit, high sensitivity, and speed up response recovery effect of speed

Active Publication Date: 2019-04-16
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrogen sulfide sensitive materials with high sensitivity, low detection limit and low working temperature still need to be further developed.

Method used

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  • Large-mesopore tungsten oxide hydrogen sulfide sensitive material with high specific area and preparation method thereof
  • Large-mesopore tungsten oxide hydrogen sulfide sensitive material with high specific area and preparation method thereof
  • Large-mesopore tungsten oxide hydrogen sulfide sensitive material with high specific area and preparation method thereof

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preparation example Construction

[0021] The invention relates to a sensitive material for detecting trace concentration hydrogen sulfide and a preparation method thereof, belonging to the technical field of sensitive materials. The high specific surface area and large mesoporous tungsten oxide hydrogen sulfide sensitive material is composed of helical nanowires of tungsten oxide, which are periodically arranged in cubes. The diameter of the nanowires is about 3-7nm, with uniform large mesoporous pores of about 12nm, and the specific surface area can reach up to 163m 2 / g. The gas sensor made of this material has a sensitivity of 1ppm hydrogen sulfide (the ratio of the resistance of the gas sensor in the measured gas to the resistance of the gas sensor in the air) of 300 at the optimum working temperature of 100 °C, and the lower detection limit is lower than 2ppb (sensitivity up to 2.28). The response value of the gas sensor to 1ppm formaldehyde, acetone, ethanol, toluene, benzene, p-xylene, ammonia, and car...

Embodiment 1

[0029] Mix 72g of surfactant P123, 2592ml of deionized water and 120ml of 37wt% hydrochloric acid at 35°C, stir for 1-12h until the surfactant is completely dissolved and dispersed evenly, then add 89ml of n-butanol, stir for 2h and then add 166ml tetraethyl orthosilicate TEOS, stirred in a water bath for 24 hours, then transferred the solid particles and the reaction solution to a polytetrafluoroethylene lining, followed by a hydrothermal reaction at 40°C for 24 hours, cooled naturally to room temperature, and washed with deionized water until neutral , Dry overnight at 70°C to obtain mesoporous silica containing surfactant, and remove P123 by calcining at 550°C in air for 6h to obtain white powder, namely mesoporous silica without surfactant.

[0030] Completely dissolve 0.48g of silicotungstic acid in 10ml of absolute ethanol to obtain an absolute ethanol solution of silicotungstic acid, add 2g of the above-mentioned treated mesoporous silica to the solution as a hard templa...

Embodiment 2

[0034] Mix 72g of surfactant P123, 2592ml of deionized water and 120ml of 37wt% hydrochloric acid at 35°C, stir for 1-12h until the surfactant is completely dissolved and dispersed evenly, then add 89ml of n-butanol, stir for 2h and then add 166ml tetraethyl orthosilicate TEOS, stirred in a water bath for 24 hours, then transferred the solid particles and the reaction solution to a polytetrafluoroethylene lining, followed by a hydrothermal reaction at 40°C for 24 hours, cooled naturally to room temperature, and washed with deionized water until neutral , Dry overnight at 70°C to obtain mesoporous silica containing surfactant, and remove P123 by calcining at 550°C in air for 6h to obtain white powder, namely mesoporous silica without surfactant.

[0035] Completely dissolve 0.96g of silicotungstic acid in 10ml of absolute ethanol to obtain an absolute ethanol solution of silicotungstic acid, add 2g of the above-mentioned treated mesoporous silica to the solution as a hard templa...

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Abstract

The invention relates to a large-mesopore tungsten oxide hydrogen sulfide sensitive material with a high specific area and a preparation method thereof. The large-mesopore tungsten oxide hydrogen sulfide sensitive material is characterized by being formed by cubically and periodically arraying tungsten oxide spiral nanowires, the diameter of the nanowires is 3-7 nm, uniform large mesopores of 12 nm are formed, and the specific area is 163m2 / g. The large-mesopore tungsten oxide hydrogen sulfide sensitive material has the following advantages of being capable of selectively detecting hydrogen sulfide gas at low working temperature, high in sensitivity and low in detection limit.

Description

technical field [0001] The invention relates to a high specific surface area large mesoporous tungsten oxide hydrogen sulfide sensitive material and a preparation method thereof. Background technique [0002] As we all know, hydrogen sulfide gas is produced in the process of chemical production, oil and gas and mineral exploration. Hydrogen sulfide is an acute and highly toxic gas with the smell of rotten eggs. Inhaling a small amount of high-concentration hydrogen sulfide can be fatal in a short time. Low-concentration hydrogen sulfide can affect the eyes, respiratory system and central nervous system, and is extremely harmful to human health. big. In addition, hydrogen sulfide is easy to mix with air to form an explosive mixture, which can cause combustion and explosion when exposed to open flames and high heat, seriously endangering public safety. Therefore, hydrogen sulfide detection must be carried out in the working environment where hydrogen sulfide gas may appear t...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82Y30/00B82Y40/00G01N27/26
CPCB82Y30/00B82Y40/00C01G41/02C01P2004/04C01P2004/16C01P2004/64C01P2006/12C01P2006/14C01P2006/16G01N27/26
Inventor 赖小勇胡冉冉王晓中刘咪杨庆凤
Owner NINGXIA UNIVERSITY
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